JPH0229627B2 - - Google Patents
Info
- Publication number
- JPH0229627B2 JPH0229627B2 JP57197721A JP19772182A JPH0229627B2 JP H0229627 B2 JPH0229627 B2 JP H0229627B2 JP 57197721 A JP57197721 A JP 57197721A JP 19772182 A JP19772182 A JP 19772182A JP H0229627 B2 JPH0229627 B2 JP H0229627B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- composite material
- resistance
- combustion chamber
- sic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000002131 composite material Substances 0.000 claims description 25
- 238000002485 combustion reaction Methods 0.000 claims description 24
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical class [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 24
- 229910052721 tungsten Inorganic materials 0.000 claims description 19
- 229910052750 molybdenum Inorganic materials 0.000 claims description 18
- 230000035939 shock Effects 0.000 claims description 14
- 229910052796 boron Inorganic materials 0.000 claims description 13
- 238000005245 sintering Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 17
- 239000000463 material Substances 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000567 combustion gas Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Ceramic Products (AREA)
Description
本発明は耐ヒートシヨツク性に優れた耐熱複合
材料及びその製造法に関する。詳しくは炭化ケイ
素（SiC）ウイスカと１種又は２種以上のMo、
Ｗ、Ｂ、Ｃとから成る耐ヒートシヨツク性に優れ
た耐熱複合材料及びその製造法に関する。
本発明の複合材料を構成する炭化ケイ素
（SiC）ウイスカは例えば次の如き特性を有する
ものである。
直径 0.1〜1.0μｍ
長さ 50〜200μｍ
アスペクト比 50〜300
密度 3.17ｇ／cm3
引張強さ 300〜1400Kgｆ／mm2
本発明者らはこの様な引張強さ等に優れた特性
を有するSiCウイスカを用い、これと金属成分等
との複合材料について鋭意検討したところ、所定
量のSiCウイスカに１種又は２種以上のMo、Ｗ、
Ｂ、Ｃを複合させて成る新規複合材料が耐熱性に
優れ、しかも耐ヒートシヨツク性にも優れている
ことを見い出した。
又本発明の耐熱複合材料は耐熱性に優れ又耐ヒ
ートシヨツク性に優れ、更に耐熱高温腐食性にも
優れているので、特にエンジンの燃焼室用就中デ
ーゼルエンジンの渦流燃焼室用として好適に用い
られることが判つた。
即ち、近年、燃料消費効率や排気ガス規制の面
などから、デイーゼルエンジンの有利さが注目を
集めており、自動車への利用についてみれば、従
来は大型トラツクが中心であつたが、乗用車にも
搭載される様になつてきた。
しかし乗用車のデイーゼルエンジンは、必然的
に小型化及び高速回転の要求が強く、そのため燃
焼室周辺の熱負荷が大とならざるを得ない。近年
ひろく採用されている渦流燃焼室をもつものにお
いては、特に燃焼室噴口部付近は高温で高圧の燃
焼ガスが高速で吹きつけ通過して行くため、局部
的に高温となり損傷が著しい。又燃料の軽油や灯
油中に含まれる不純物、特にイオウやバナジウム
に起因する腐食作用も受ける。最近の出力性能向
上の要求にこたえたターボチヤージヤーの装備に
より、エンジンの燃焼条件は一層可酷なものとな
り、燃焼室を構成する材料に対して極めて高度の
耐熱性と耐高温腐食性が要求される様になつた。
デイーゼルエンジンの渦流燃焼室の材料として、
従来は、SUH3、SUH661等の耐熱鋼や
Nimocast 80の様なニツケル基耐熱合金が用い
られてきたが、これら材料はいずれも耐用寿命を
決定する耐ヒートシヨツク性（クラツク発生の有
無により判断、耐ヒートクラツク性とも称し得
る）が不十分であり、又噴口部先端の耐高温腐食
性にも問題があり、デイーゼルエンジンの性能を
十分に発揮させる上で制約になつていた。
本発明はその特性上一般耐熱部材として好適に
使用できる他、上記した問題を解消できる耐熱複
合材料に係るものであり、耐ヒートクラツク性と
耐高温腐食性を大巾に改善することに成功した。
本発明は炭化ケイ素ウイスカを50〜98％（重
量、以下同じ）含み、残部がMo、Ｗ、Ｂ、Ｃの
１種又は２種以上より成る耐ヒートシヨツク性に
優れた耐熱複合材料に存する。
又本発明は耐ヒートシヨツク性に優れた耐熱複
合材料を好適に製造する方法に存し、その特徴
は、炭化ケイ素ウイスカを50〜98％含み、残部が
Mo、Ｗ、Ｂ、Ｃの１種又は２種以上より成るブ
レンド物を真空中又は不活性ガス中で温度900℃
以上に焼結することにある。
本発明の複合材料は上記の如く炭化ケイ素ウイ
スカ50〜98％、１種又は２種以上Mo、Ｗ、Ｂ、
Ｃ残部即ち２〜50％より成る。これらMo、Ｗ、
Ｂ、Ｃの含有量については耐熱複合材料として
の、特に高温での耐酸化性の低下やSiCの靭性の
改善、低下を考慮する必要がある。Mo又は（及
び）Ｗとの複合の場合、Mo、Ｗの含有量が50％
を越えるときには複合材料の高温での耐酸化性が
低下し、一方２％末満であるときにはSiCの靭性
が改善されない。Mo、Ｗの場合好ましく10〜30
％である。Ｂ又は（及び）Ｃとの複合の場合、
Ｂ、Ｃの含有量が50％を越えるときにはやはり高
温での耐酸化性の低下が著しいし、逆にSiCの靭
性の低下がみられるようになり、一方２％未満で
はSiCの靭性の改善ができない。Ｂ、Ｃの場合好
ましくは10〜25％である。
Mo、Ｗ、Ｂ、Ｃは本発明に於いてバインダー
的役割を果たすものと考えられ、SiCの成形性を
高める。即ち、本発明に於いては、通常SiCと他
金属等とを複合させる際に使用されるプラスチツ
ク等の如きバインダーを必要とせずに、所定量の
SiCとMo、Ｗ、Ｂ、Ｃ粉末とをブレンドし、好
ましくは上記製法で焼結することにより耐ヒート
シヨツク性に優れた耐熱複合材料が得られる。
本発明の成立の過程に於いて、Mo、Ｗ以外の
耐火金属例えばFe、TiについてSiCとの複合が検
討されたが、FeやTiの場合Ｃとの反応が起こり
好ましくないことが判つた。この点Mo、ＷはＣ
との反応が起こらず好ましいばかりでなく、得ら
れた耐熱複合材料は耐ヒートシヨツク性、耐熱
性、耐高温腐食性に優れたものであつた。もちろ
ん、SiCとＢ又は（及び）Ｃとの複合も好ましい
ものである。
SiCの含有量については上記から50〜98％であ
ることが適当である。前記したMo、Ｗ、Ｂ、Ｃ
の含有量の限定理由に加えて、SiCが98％を越え
る場合には成形上難点があり、複合材料として強
度の高いものが得られない。
次に本発明複合材料の前記した製造法について
の説明を補足する。
本発明の製造法により複合材料を得る場合、ブ
レンド物は真空中又は不活性ガス中でブレス焼結
することが必要である。大気中で行う場合には
Mo、Ｗ、Ｂ、Ｃが分解し、所望の複合材料が得
られない。
又プレス焼結は温度900℃以上で行うことが必
要である。900℃を越えないときには焼結強度の
高いものが得られない。当該温度については特に
上限はなく、高温である程焼結強度の高いものが
容易に得られる。通常900〜1250℃である。
本発明の製造法の好ましい一実施態様を例示す
ると、SiCウイスカの所定量をよくほぐし、当該
ウイスカにMo、Ｗ、Ｂ、Ｃの１種又は２種以上
粉末の所定量をよくブレンドし、所定の型に入れ
て冷間成型する。尚本発明でいうブレンド物には
かかる冷間成型後のブレンド物をも包含する。
次いで当該冷間成型後、同タイプの熱間プレス
用型で真空中又はN2等の不活性ガス中、好まし
くは圧力10Kg／mm2以上、温度900〜1250℃で熱間
プレス焼結を行い、所望により仕上げ加工を施
す。Mo、Ｗ、Ｂ、Ｃはいずれか１種でもよい
が、二種以上を用いることが好ましく、Mo、Ｗ
との組合せやＢとＣとの組合せが推奨される。
次に本発明を実施例及び比較例を以つて説明す
る。
第１表は本実施例に供した試料の化学組成を示
す。
上記試料は、所定量（第１表）のSiCウイスカ
をよくほぐし、これに残成分（Mo、Ｗ、Ｂ、
Ｃ）の所定量（第１表）を混ぜてよく混合し、所
定の型に入れて冷間成形後、同タイプの熱間プレ
ス用型で真空中、1250℃で熱間プレス焼結を行つ
た後、若干の仕上げ加工を行つて作つた。
The present invention relates to a heat-resistant composite material with excellent heat shock resistance and a method for producing the same. For details, silicon carbide (SiC) whiskers and one or more types of Mo,
The present invention relates to a heat-resistant composite material composed of W, B, and C that has excellent heat shock resistance, and a method for producing the same. The silicon carbide (SiC) whiskers constituting the composite material of the present invention have, for example, the following characteristics. Diameter 0.1 to 1.0 μm Length 50 to 200 μm Aspect ratio 50 to 300 Density 3.17 g/cm 3 Tensile strength 300 to 1400 Kgf/mm 2 The present inventors have developed a SiC whisker with excellent properties such as tensile strength. After intensive study on composite materials using this and metal components, we found that a predetermined amount of SiC whiskers contains one or more types of Mo, W,
It has been discovered that a new composite material made by combining B and C has excellent heat resistance and heat shock resistance. Furthermore, the heat-resistant composite material of the present invention has excellent heat resistance, excellent heat shock resistance, and also excellent heat resistance and high temperature corrosion resistance, so it is particularly suitable for use in engine combustion chambers, especially diesel engine swirl combustion chambers. It turns out that it can be used. In other words, in recent years, the advantages of diesel engines have been attracting attention in terms of fuel consumption efficiency and exhaust gas regulations, and when looking at their use in automobiles, they have traditionally been used mainly in large trucks, but they are also being used in passenger cars. It is starting to be installed. However, diesel engines for passenger cars are inevitably required to be compact and rotate at high speeds, which inevitably results in a large heat load around the combustion chamber. In combustion chambers with whirlpool combustion chambers, which have been widely adopted in recent years, high-temperature, high-pressure combustion gas blows through the combustion chamber at high speed, especially near the nozzle of the combustion chamber, resulting in localized high temperatures and significant damage. It is also subject to corrosive effects caused by impurities, particularly sulfur and vanadium, contained in diesel fuel and kerosene. With the introduction of turbochargers that meet the recent demands for improved output performance, engine combustion conditions have become even more severe, and the materials that make up the combustion chamber have extremely high heat resistance and high-temperature corrosion resistance. It became like being demanded.
As a material for the swirl combustion chamber of diesel engines,
Conventionally, heat-resistant steels such as SUH3 and SUH661 were used.
Nickel-based heat-resistant alloys such as Nimocast 80 have been used, but all of these materials have insufficient heat shock resistance (judged by the presence or absence of cracks, which can also be called heat crack resistance), which determines their service life. There was also a problem with the high-temperature corrosion resistance of the tip of the nozzle, which was a constraint in fully demonstrating the performance of diesel engines. The present invention relates to a heat-resistant composite material that can be suitably used as a general heat-resistant member due to its characteristics and can solve the above-mentioned problems, and has succeeded in greatly improving heat crack resistance and high-temperature corrosion resistance. The present invention resides in a heat-resistant composite material containing 50 to 98% (by weight, the same hereinafter) of silicon carbide whiskers, with the remainder consisting of one or more of Mo, W, B, and C, and having excellent heat shock resistance. The present invention also resides in a method for suitably producing a heat-resistant composite material with excellent heat shock resistance, which is characterized by containing 50 to 98% silicon carbide whiskers, with the remainder being
A blend consisting of one or more of Mo, W, B, and C at a temperature of 900°C in vacuum or inert gas.
There is more to sintering. As mentioned above, the composite material of the present invention contains 50 to 98% silicon carbide whiskers, one or more types of Mo, W, B,
The balance consists of C, that is, 2 to 50%. These Mo, W,
Regarding the content of B and C, it is necessary to take into consideration the reduction in oxidation resistance especially at high temperatures and the improvement or reduction in the toughness of SiC as a heat-resistant composite material. In the case of a composite with Mo or (and) W, the content of Mo and W is 50%
When it exceeds 2%, the oxidation resistance of the composite material at high temperatures decreases, while when it is less than 2%, the toughness of SiC is not improved. Preferably 10 to 30 for Mo and W
%. In case of combination with B or (and) C,
When the content of B and C exceeds 50%, the oxidation resistance at high temperatures decreases significantly, and conversely, the toughness of SiC begins to decrease, while when the content of B and C exceeds 2%, the toughness of SiC does not improve. Can not. In the case of B and C, it is preferably 10 to 25%. Mo, W, B, and C are considered to play the role of binders in the present invention, and improve the formability of SiC. That is, the present invention does not require a binder such as plastic, which is normally used when combining SiC with other metals.
A heat-resistant composite material with excellent heat shock resistance can be obtained by blending SiC with Mo, W, B, and C powders and sintering, preferably by the above manufacturing method. In the process of establishing the present invention, the combination of refractory metals other than Mo and W, such as Fe and Ti, with SiC was investigated, but it was found that Fe and Ti react with C and are therefore undesirable. At this point Mo, W is C
Not only was the heat-resistant composite material obtained excellent in heat shock resistance, heat resistance, and high-temperature corrosion resistance, which was preferable because no reaction occurred. Of course, a combination of SiC and B or (and) C is also preferable. From the above, it is appropriate that the content of SiC is 50 to 98%. Mo, W, B, C mentioned above
In addition to the reason for limiting the content of SiC, if SiC exceeds 98%, there will be difficulties in forming, making it impossible to obtain a composite material with high strength. Next, a supplementary explanation will be given of the above-mentioned manufacturing method of the composite material of the present invention. When obtaining a composite material by the production method of the present invention, it is necessary to press-sinter the blend in vacuum or in an inert gas. When carried out in the atmosphere
Mo, W, B, and C decompose and the desired composite material cannot be obtained. Further, press sintering must be performed at a temperature of 900°C or higher. If the temperature does not exceed 900°C, high sintering strength cannot be obtained. There is no particular upper limit to the temperature, and the higher the temperature, the easier it is to obtain a product with higher sintering strength. Usually 900-1250℃. To illustrate a preferred embodiment of the manufacturing method of the present invention, a predetermined amount of SiC whiskers is thoroughly loosened, and a predetermined amount of powder of one or more of Mo, W, B, and C is thoroughly blended into the whisker. Place in a mold and cold form. Incidentally, the blended product as used in the present invention also includes such a blended product after cold molding. Then, after the cold forming, hot press sintering is performed using the same type of hot press mold in vacuum or in an inert gas such as N2 , preferably at a pressure of 10 kg/mm2 or more and a temperature of 900 to 1250 °C. , and finish processing as desired. Any one type of Mo, W, B, and C may be used, but it is preferable to use two or more types, and Mo, W
A combination with B and C is recommended. Next, the present invention will be explained using Examples and Comparative Examples. Table 1 shows the chemical composition of the samples used in this example. The above sample was prepared by thoroughly loosening a predetermined amount (Table 1) of SiC whiskers, and adding residual components (Mo, W, B,
Mix the specified amount of C) (Table 1), mix well, place in a specified mold and cold form, then hot press sinter at 1250℃ in vacuum using the same type of hot press mold. After that, I did some finishing work and made it.
【表】
次に上記本発明材１〜５について耐熱耐酸化性
試験を行つた。即ち15×50×５mmの各試料につい
て1700℃で大気中１時間加熱后の変化を調べた。
その結果本発明材１〜５について、いずれも何ら
の変化も認められず、耐熱耐酸化性の優れている
ことが判つた。
次に上記寸法、形状の試料について熱衝撃試験
（ヒートシヨツクテスト）を行つた。即ち本発明
材１〜５を先ず1700℃の加熱炉で加熱した後、直
ちに５℃の冷水中に投入する試験を繰り返して行
つた。その結果いずれの試料も30回以上のサイク
ルを繰り返してもクラツクを発生することはな
く、熱衝撃性に優れていることが認められた。
更に、本発明材１〜５を用い、第１図〜第３図
に示す如きデイーゼルエンジンの渦流燃焼室を前
記した方法でプレス焼結して作成し、このものの
サイクルテストを行つた。尚第１図〜第３図に示
すデイーゼルエンジンの渦流燃焼室について説明
すると、図中１が燃焼室であり、２が燃焼ガスの
噴口部である。尚第３図では燃焼室の下半分だけ
を示し、上半分及びシリンダーは点線で示してあ
る。
この噴口部２は高温高圧の燃焼ガスが高速で吹
き抜け、突端部２１，２２は100℃を超える高温
に達する。しかも燃焼ガスは酸化性かつ腐食性で
ある。従つて、耐高温腐食性、耐ヒートクラツク
性が要求される。
サイクルテストは2200c.c.の排気量の４サイクル
デイーゼルエンジンに用いる渦流燃焼室につい
て、先ず4/4負荷、5000rpmで８分間、次いで無
負荷、1000rpmで５分間のサイクルを、延べ200
時間にわたつて繰り返して行つた。
そして、200時間後の主として燃焼室の噴口部
の腐食状況とヒートクラツク発生の有無を調べ
た。結果を第２表に示す。
第２表に示す如く噴口部の腐食は認められず、
又ヒートクラツクも生じなかつた。
尚第２表には比較例として従来から使用されて
いるSUH3、Nimocast80についてのテスト結果
を併記した。[Table] Next, heat resistance and oxidation resistance tests were conducted on the above-mentioned invention materials 1 to 5. That is, each sample of 15 x 50 x 5 mm was heated at 1700° C. for 1 hour in the air, and then the changes were investigated.
As a result, no change was observed in any of Inventive Materials 1 to 5, indicating that they had excellent heat resistance and oxidation resistance. Next, a thermal shock test was conducted on the sample having the above dimensions and shape. That is, a test was repeated in which the materials 1 to 5 of the present invention were first heated in a heating furnace at 1700°C and then immediately placed in cold water at 5°C. As a result, none of the samples developed cracks even after repeated cycles of 30 times or more, and was found to have excellent thermal shock resistance. Furthermore, using the materials 1 to 5 of the present invention, a swirl combustion chamber for a diesel engine as shown in FIGS. 1 to 3 was press-sintered by the method described above, and a cycle test was performed on this product. The vortex combustion chamber of the diesel engine shown in FIGS. 1 to 3 will be described. In the figure, 1 is a combustion chamber, and 2 is a combustion gas nozzle. In FIG. 3, only the lower half of the combustion chamber is shown, and the upper half and cylinder are indicated by dotted lines. High-temperature, high-pressure combustion gas blows through the nozzle portion 2 at high speed, and the tip portions 21 and 22 reach a high temperature exceeding 100°C. Moreover, the combustion gas is oxidizing and corrosive. Therefore, high temperature corrosion resistance and heat crack resistance are required. The cycle test was conducted for a vortex combustion chamber used in a four-stroke diesel engine with a displacement of 2200 c.c., first at 4/4 load for 8 minutes at 5000 rpm, then at no load for 5 minutes at 1000 rpm for a total of 200 cycles.
This was repeated over time. After 200 hours, the corrosion status of the nozzle part of the combustion chamber and the occurrence of heat cracks were investigated. The results are shown in Table 2. As shown in Table 2, no corrosion was observed at the nozzle.
Also, no heat crack occurred. Table 2 also shows the test results for conventionally used SUH3 and Nimocast80 as comparative examples.
【表】
尚噴口部を本発明材２で先ず成型焼結して作
り、噴口部以外の燃焼室部分を比較材１で鋳ぐる
んで燃焼室を作り、上記と同様のテストを行つた
が、この場合も噴口部の腐食は認められず、又ヒ
ートクラツクも生じなかつた。又鋳ぐるみはロス
トワツクス法により行い、本発明材２よりなる噴
口部を鋳型中に置き、これに比較材１の溶湯を注
いで鋳ぐるんだ。
次に本発明材２及び４について熱伝導率を測定
した結果、SiCウイスカ100％単独の場合に比し
て10〜20％大きい値を示した。この事は寿命延長
にある程度寄与していると考えられる。
以上の通り、本発明複合材料は耐熱耐酸化性に
於いて優れ、又耐ヒートシヨツク性にも優れ、デ
イーゼルエンジンの燃焼室用として使用した場合
腐食が認められず、又ヒートクラツクの発生もな
く、優れた複合材料であることが判る。
更に、本発明複合材料はこの様な特性を有する
ので、エンジンの予燃焼室、主燃焼室就中デイー
ゼルエンジンの渦流燃焼室の噴口部に好適に使用
される他、耐熱部材として、ラジアンドチユー
ブ、自動車の加熱プラグ、バーナーノーズル、熱
交換器、ターボの羽根車インピラー、排気管、ピ
ストン等の耐熱性、耐ヒートクラツク性等が要求
される装置部材として好適に使用される。[Table] The nozzle part was first made by molding and sintering with Inventive Material 2, and the combustion chamber other than the nozzle part was cast with Comparative Material 1, and the same tests as above were conducted. In this case as well, no corrosion was observed at the nozzle, and no heat cracks occurred. Casting was carried out by the lost wax method, and the spout made of Inventive Material 2 was placed in a mold, and the molten metal of Comparative Material 1 was poured into it and cast. Next, as a result of measuring the thermal conductivity of Inventive Materials 2 and 4, the results showed values that were 10 to 20% larger than those of 100% SiC whiskers alone. This is thought to contribute to a certain extent to the extension of lifespan. As mentioned above, the composite material of the present invention has excellent heat and oxidation resistance, and also has excellent heat shock resistance, and when used for the combustion chamber of a diesel engine, no corrosion is observed and no heat cracks occur. It turns out that it is an excellent composite material. Furthermore, since the composite material of the present invention has such characteristics, it is suitable for use in the pre-combustion chamber of an engine, the main combustion chamber, especially the nozzle part of the swirl combustion chamber of a diesel engine, and is also used as a heat-resistant member in a radial tube. It is suitably used as equipment components that require heat resistance, heat crack resistance, etc., such as automobile heating plugs, burner nozzles, heat exchangers, turbo impeller impillars, exhaust pipes, and pistons.
図面はデイーゼルエンジン用渦流燃焼室の一例
についてその構成を説明するためのものであつ
て、第１図は平面図、第２図は底面図、第３図は
縦断面図である。
１……燃焼室、２……噴口部。
The drawings are for explaining the structure of an example of a swirl combustion chamber for a diesel engine, and FIG. 1 is a plan view, FIG. 2 is a bottom view, and FIG. 3 is a longitudinal sectional view. 1... Combustion chamber, 2... Nozzle part.
Claims (1)
部がMo、Ｗ、Ｂ、Ｃの１種又は２種以上より成
る耐ヒートシヨツク性に優れた耐熱複合材料。 ２ エンジンの燃焼室に使用される、特許請求の
範囲第１項記載の耐熱複合材料。 ３ 炭化ケイ素ウイスカを50〜98重量％を含み、
残部がMo、Ｗ、Ｂ、Ｃの１種又は２種以上より
成るブレンド物を真空中又は不活性ガス中で温度
900℃以上でプレス焼結することを特徴とする耐
ヒートシヨツク性に優れた耐熱複合材料の製造
法。[Scope of Claims] 1. A heat-resistant composite material with excellent heat shock resistance, containing 50 to 98% by weight of silicon carbide whiskers, and the remainder consisting of one or more of Mo, W, B, and C. 2. The heat-resistant composite material according to claim 1, which is used in the combustion chamber of an engine. 3 Contains 50 to 98% by weight of silicon carbide whiskers,
A blend of one or more of Mo, W, B, and C, the remainder of which is heated in vacuum or in an inert gas at a temperature
A method for producing heat-resistant composite materials with excellent heat shock resistance, characterized by press sintering at temperatures of 900°C or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57197721A JPS5988371A (en) | 1982-11-12 | 1982-11-12 | Heat-resistant composite material and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57197721A JPS5988371A (en) | 1982-11-12 | 1982-11-12 | Heat-resistant composite material and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5988371A JPS5988371A (en) | 1984-05-22 |
| JPH0229627B2 true JPH0229627B2 (en) | 1990-07-02 |
Family
ID=16379242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57197721A Granted JPS5988371A (en) | 1982-11-12 | 1982-11-12 | Heat-resistant composite material and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5988371A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0668637U (en) * | 1993-03-05 | 1994-09-27 | 山岡金属工業株式会社 | Cooking net |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61166963A (en) * | 1985-01-17 | 1986-07-28 | Daido Steel Co Ltd | High temperature tool materials |
| JPH0832590B2 (en) * | 1986-10-08 | 1996-03-29 | 株式会社日立製作所 | Silicon carbide sintered body and manufacturing method thereof |
| JP2814744B2 (en) * | 1990-11-30 | 1998-10-27 | 松下電器産業株式会社 | Automatic water heater |
-
1982
- 1982-11-12 JP JP57197721A patent/JPS5988371A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0668637U (en) * | 1993-03-05 | 1994-09-27 | 山岡金属工業株式会社 | Cooking net |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5988371A (en) | 1984-05-22 |
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