JPH02212385A - Modified refractory jig made of carbon material and production thereof - Google Patents
Modified refractory jig made of carbon material and production thereofInfo
- Publication number
- JPH02212385A JPH02212385A JP1033219A JP3321989A JPH02212385A JP H02212385 A JPH02212385 A JP H02212385A JP 1033219 A JP1033219 A JP 1033219A JP 3321989 A JP3321989 A JP 3321989A JP H02212385 A JPH02212385 A JP H02212385A
- Authority
- JP
- Japan
- Prior art keywords
- jig
- carbon material
- fireproof
- carbon
- refractory
- 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.)
- Granted
Links
- 239000003575 carbonaceous material Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims abstract description 14
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 150000001845 chromium compounds Chemical class 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 238000004901 spalling Methods 0.000 abstract description 8
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract description 7
- 229910000423 chromium oxide Inorganic materials 0.000 abstract description 7
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000005255 carburizing Methods 0.000 abstract description 3
- 238000005470 impregnation Methods 0.000 abstract description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 3
- 229910052804 chromium Inorganic materials 0.000 abstract 3
- 239000011651 chromium Substances 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000007654 immersion Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 19
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- -1 chromate (211CrO4) Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- JOSWYUNQBRPBDN-UHFFFAOYSA-P ammonium dichromate Chemical compound [NH4+].[NH4+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O JOSWYUNQBRPBDN-UHFFFAOYSA-P 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 241001282110 Pagrus major Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011271 tar pitch Substances 0.000 description 1
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、物品を乗せたまま加熱炉中へ出し入れする台
として使用するカーボン材からなる耐火治具を耐摩耗性
、耐衝撃性であって、耐熱性でスポーリングをおこさず
、耐久性を高くし得、さらに、物品ｌ＼の浸炭を防止し
得るカーボン材からなる改質された耐火治具及びその製
造方法に関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention provides a fireproof jig made of carbon material that is used as a stand for loading and unloading articles into and out of a heating furnace with wear resistance and impact resistance. The present invention relates to a modified fireproof jig made of a carbon material that is heat resistant, does not cause spalling, has high durability, and can prevent carburization of articles, and a method for manufacturing the same.
（従来の技術）
カーボン材は、融点が高く、熱伝導性に優れ、溶融した
金属、金属酸化物、塩類などに耐え得、耐熱材料として
優れた特性を有している。したがって、従来から加熱炉
中に物品を乗せて出し入れする台として使用する耐火治
具して、たとえば、鱗片状又は粒状の結晶状態の黒鉛を
タールピッ千のような有機質結合剤を添加して混浬し、
プレスにより押出し又は型込成型した後、加熱焼成し、
所望の形状としたものが使用されている。(Prior Art) Carbon materials have high melting points, excellent thermal conductivity, can withstand molten metals, metal oxides, salts, etc., and have excellent properties as heat-resistant materials. Therefore, conventionally, fireproof jigs used as tables for loading and unloading articles into heating furnaces have been used, for example, by mixing scale-like or granular graphite in a crystalline state with the addition of an organic binder such as tarpit. death,
After extruding or molding with a press, heat and bake,
A desired shape is used.
（発明が解決しようとする課題）
しかしながら、従来のカーボン材からなる耐火治具は、
前記したように優れた特性を有する反面、酸化消耗し易
く、衝撃に対して破壊し易く、又、急熱急冷の繰返しに
より劣化破壊するいわゆるスポーリング現象が生じ、耐
久性において満足し得るものではなく、また被熱処理物
品との接触部分に浸炭現象が起って硬さの上昇や場合に
よっては表面割れの発生など多くの問題があった。(Problem to be solved by the invention) However, conventional fireproof jigs made of carbon materials,
Although it has excellent properties as described above, it is easily consumed by oxidation, easily destroyed by impact, and suffers from the so-called spalling phenomenon in which it deteriorates and breaks due to repeated rapid heating and cooling, so it is not satisfactory in terms of durability. Furthermore, there were many problems such as carburization occurring at the contact portion with the article to be heat treated, resulting in increased hardness and, in some cases, surface cracking.
本発明は、前記問題を解決し、スポーリング現象を極力
おさえ、耐摩耗性、耐衝撃性を改善して耐久性を向上せ
しめかつ浸炭を防止し得る耐火治具及びその製造方法を
目的とするものである９（課題を解決するための手段）
本発明者は、前記問題を解決し、前記目的を達成するた
めに鋭意研究を重ねた結果、最終形状に成形焼成したカ
ーボン材からなる耐火治具に、水溶性クロム化合物を含
浸させ加熱して不溶性クロム（ヒ合拘を生成させること
によって硬化層を形成させた耐火治具とすることによっ
て目的を達し得ることを見出して本発明を完成するに至
った。すなわち、本発明の第１の実施態様は、カーボン
材からなる耐火治具に不溶性クロム化合物によって強化
された硬化層を形成したカーボン材からなる改質された
耐火治具であり、第２の実施態様は、カーボン材からな
る耐火治具を水溶性クロム化合物の濃水溶液に含浸させ
た後、乾燥し、ついで３５０〜０００℃に加熱する処理
を少なくとも１回行ない、さらに、クロム酸の濃水溶液
に含浸させた後、乾燥し、ついで３５０〜６００℃に加
熱する処理を少なくとも１回行なうカーボン材からなる
改善された耐火治具の製造方法である。The object of the present invention is to provide a fireproof jig that can solve the above problems, minimize the spalling phenomenon, improve wear resistance and impact resistance, increase durability, and prevent carburization, and a method for manufacturing the same. 9 (Means for Solving the Problems) As a result of intensive research to solve the above problems and achieve the above objects, the present inventors have developed a fireproof cure made of carbon material molded and fired into a final shape. The present invention was completed by discovering that the object could be achieved by impregnating a water-soluble chromium compound into a fire-resistant jig and heating it to form a hardened layer by forming an insoluble chromium compound. That is, the first embodiment of the present invention is a modified fireproof jig made of a carbon material in which a hardened layer reinforced by an insoluble chromium compound is formed on the fireproof jig made of a carbon material, In the second embodiment, a refractory jig made of carbon material is impregnated with a concentrated aqueous solution of a water-soluble chromium compound, dried, and then heated at 350 to 000°C at least once. This is an improved method for manufacturing a fireproof jig made of a carbon material, which comprises impregnating it in a concentrated aqueous solution of carbon material, drying it, and then heating it at 350 to 600° C. at least once.
本発明におけるカーボン材からなる耐火治具は、たとえ
ば、鱗片状又は粒状の黒鉛をタールピッチのような有機
質結合剤によって結合して成型し、焼成することによっ
て、一般に、３０〜４０％の開放気孔を有す−るような
、従来の材料、方法で製造されたものを使用する。The fireproof jig made of carbon material in the present invention is generally produced by bonding flaky or granular graphite with an organic binder such as tar pitch, molding it, and firing it. Use conventional materials and methods, such as
又、水溶性り四）、［ヒ合鞠としては、たとえば゛、ク
ロム酸亜鈴（２１１ＣｒＯ４） 、クロム酸マダイ、シ
ウム（Ｈ（ＩＣｒ０４）などのようなりロム酸塩、又は
、重クロム酸すＩ・リウム（Ｎａ２（Ｊ２０７＞ 、重
クロム酸カリウｌ、 （Ｋ２Ｃｒ２０ｙ）、重クロム酸
アンモニウム（（ＮＨ４）２Ｃｒ２０７）などのような
重クロム酸塩か使用される。しかしながら、生業性、経
済性を考慮した場合、クロム酸（ＣｒＯ３）の液に酸化
亜鈴（２＋１０）を溶解させて生成したクロム酸亜鉛を
使用することが好ましい。In addition, water-soluble compounds such as chromate (211CrO4), red chromate (red sea bream), chromate (H (ICr04), etc.), or dichromate (ICr04), etc.・Dichromates such as Na2(J207>, potassium dichromate, (K2Cr20y), ammonium dichromate ((NH4)2Cr207), etc. are used.However, taking into consideration the commercial efficiency and economic efficiency In this case, it is preferable to use zinc chromate produced by dissolving dumbbell oxide (2+10) in a chromic acid (CrO3) solution.
しかして、前記のようにして製造したカーボン材からな
る耐火治具上に形成される酸化クロムのような不溶性ク
ロム化合物によって強化された硬［ヒ層を形成するため
の水溶性り四ｌ、化合物の濃水溶液の含浸−乾燥−加熱
という処理は、まず、前記のようなりロム酸塩又は重ク
ロム酸塩の少なくとも１種類の化合物を使用して、比重
１．５〜１，７の濃水溶液として、この濃水溶液中に前
記の耐火治具を浸漬あるいは刷毛塗りなどによって、耐
火治具の開放気孔中Ｉ＼も十分に濃水溶液を含浸せしめ
るようにし、ついで７０〜９０°Ｃで乾燥し、さらに加
熱炉中で３５０・〜０００’Ｃ″ｉｌ：′０．５〜２時
間加熱することによって行なわれる。この濃水溶液の含
浸−乾燥−加熱からなる処理は、少なくとも１回行なう
が、２〜３回繰返して行なうことが好ましい。Therefore, a water-soluble compound for forming a hard layer reinforced by an insoluble chromium compound such as chromium oxide formed on the fireproof jig made of carbon material manufactured as described above. The treatment of impregnation-drying-heating of a concentrated aqueous solution of The above-mentioned refractory jig is immersed in this concentrated aqueous solution or coated with a brush so that the open pores of the refractory jig are sufficiently impregnated with the concentrated aqueous solution, and then dried at 70 to 90°C. This is carried out by heating in a heating oven at 350.000'C"il for 0.5 to 2 hours. This treatment consisting of impregnation with a concentrated aqueous solution, drying and heating is carried out at least once, but for 2 to 3 hours. It is preferable to repeat the process several times.
この処理において、クロム酸塩又は重クロム酸塩のよう
な水溶性クロム化合物の濃水溶液を使用するのは、遊離
のクロム酸がカーボンと接触するとカーボンを酸化し、
耐火治具の表面を脆くするのでこれを避けるなめに、比
較的酸化力の低いクロム酸塩又は重クロム酸塩を使用す
る。In this process, the use of concentrated aqueous solutions of water-soluble chromium compounds, such as chromate or dichromate, oxidizes the carbon when free chromic acid comes into contact with the carbon.
To avoid brittleness of the surface of the refractory jig, use chromate or dichromate, which has a relatively low oxidizing power.
この第１工程において耐火治具の開放気孔を含む表面を
一様に不溶性の酸化クロムで被着した後、次に、第２工
程として、クロム酸の濃水溶液による陰浸−乾燥−加熱
する処理を行なう。この第２工程におけるクロム酸の濃
水溶液としては、クロム酸（ＣｒＯ３）単独を使用して
、比重１．５〜１．７の濃水溶液として使用する。なお
、クロム酸塩、重クロム酸塩とともに使用することもで
きる。第２工程は、この濃水溶液を第１工程の終了した
耐火治具に浸漬又は刷毛塗りなどによって含浸せしめ、
７０〜９０℃で乾燥し、ついで３５０〜６００℃で０．
５〜２時間加熱することによって行なわれる。この第２
工程は、少なくとも１回行なうが、２−３回繰返して行
なうことが好ましい。この第２工程におけるクロム酸（
ＣｒＯ＋）は、結合強度を高め得る点で優れた効果を発
揮するものである。In this first step, the surface including open pores of the refractory jig is uniformly coated with insoluble chromium oxide, and then, as a second step, a process of infiltration with a concentrated aqueous solution of chromic acid, drying, and heating is performed. Do this. As the concentrated aqueous solution of chromic acid in this second step, chromic acid (CrO3) alone is used as a concentrated aqueous solution with a specific gravity of 1.5 to 1.7. In addition, it can also be used together with chromate and dichromate. In the second step, the refractory jig used in the first step is impregnated with this concentrated aqueous solution by dipping or brushing.
Dry at 70-90°C, then dry at 350-600°C.
This is done by heating for 5 to 2 hours. This second
The process is carried out at least once, but preferably repeated 2-3 times. Chromic acid (
CrO+) exhibits an excellent effect in that it can increase bond strength.
なお、第１、第２工程における加熱処理の加熱温度を３
５０〜０００’Ｃとしたのは、３５０°Ｃ以下では、水
溶性クロム化合物が酸化クロム（Ｃｒ２０ａ＞ ’＼の
変換が十分でなく、６００℃以上では、単にエネルギー
の消費となり効果の向上がないからである。In addition, the heating temperature of the heat treatment in the first and second steps was set to 3.
The reason for setting it at 50 to 000'C is that below 350°C, water-soluble chromium compounds are not sufficiently converted to chromium oxide (Cr20a>'\), and above 600°C, energy is simply consumed and there is no improvement in effectiveness. It is from.
本発明の処理によって、水溶性クロム化合物は、酸化ク
ロムに変換し、耐火治具の開放気孔内に沈積充填され、
この酸化クロムによってカーボンの結合強度を増し、高
温におけるカーボンの酸化を防止し、とくに、表面に形
成された緻密な強化された硬化層によって耐摩耗、浸炭
防止などが向上されるものである。Through the treatment of the present invention, the water-soluble chromium compound is converted to chromium oxide, which is deposited and filled into the open pores of the refractory jig,
This chromium oxide increases the carbon bond strength and prevents carbon oxidation at high temperatures.In particular, the dense hardened layer formed on the surface improves wear resistance and carburization prevention.
（実施例） 次に、本発明の実施例を述べる。(Example) Next, examples of the present invention will be described.
実施例 １
１）耐火治具： ３００ 、Ａ、３００べ１０の大きさ
の板状の耐火治具を、黒鉛を使用して通常の方法で成型
し焼成して製造した。Example 1 1) Fireproof jig: A plate-shaped fireproof jig with a size of 300 mm, A, and 300 mm was manufactured by molding and firing using graphite in a conventional manner.
２） 第１工程：り・ロム酸２００重量部に酸化亜鉛４
０．７重量部を溶解して調製した２クロム酸亜鉛（２０
ＣＩ’２０））の濃水溶液に前記耐火治具を浸漬し、内
部まで濃水溶液を含浸せしめ、８０℃で１時間乾燥し、
ついで加熱炉中で５００℃て土５時間加熱処理する第１
工程を２回繰返して施行した。2) First step: 200 parts by weight of ri-romic acid and 4 parts by weight of zinc oxide
Zinc dichromate (20 parts by weight) prepared by dissolving 0.7 parts by weight
Immerse the fireproof jig in a concentrated aqueous solution of CI'20)), impregnate the inside with the concentrated aqueous solution, and dry at 80 ° C. for 1 hour.
Next, the soil is heated in a heating furnace at 500°C for 5 hours.
The process was repeated twice.
３）第２工程：第１工程を終了した耐火治具を、比重１
．６５のクロム酸濃水溶液に浸漬してクロム酸を含浸せ
しめ、８０℃で１時間乾燥し、ついで５００℃で１．５
時間加熱処理する第２工程を２回繰返して改質された耐
火治具を得た。3) Second step: The fireproof jig that has completed the first step has a specific gravity of 1
．． 65 to impregnate it with chromic acid, dried at 80°C for 1 hour, and then heated to 500°C to impregnate it with chromic acid.
The second step of heat treatment was repeated twice to obtain a modified fireproof jig.
４）試験結果：このようにして得た耐火治具を、無酸化
雰囲気中１１４０’Ｃのろう付は炉中を耐火治具上にＪ
ＩＳ Ｇ ３４４５ ＳＴＫＭ １２ ＣＥＣ（炭素量
０．２０％以下〉製の角状の鉄パイプ（３００ｍｍ、べ
１ Ｂｍｍ 入１８ｍｍで肉厚１ ｍｍ ）を乗せて通
した後、常温に自然冷却する繰返し試験を行なった。そ
の結果、前記試験を１５回繰返し試験を行なったが、全
く変化はみられず、スポーリングの発生も皆無であり、
角状の鉄バイブｌ＼の浸炭現象も認められなかった。4) Test results: The refractory jig thus obtained was brazed at 1140'C in a non-oxidizing atmosphere.
IS G 3445 STKM 12 Repeated test in which a rectangular iron pipe (300 mm, 1 Bmm containing 18 mm, wall thickness 1 mm) made of CEC (carbon content 0.20% or less) is passed through, and then naturally cooled to room temperature. As a result, the above test was repeated 15 times, but no change was observed and no spalling occurred.
No carburizing phenomenon was observed in the square iron vibrator.
実施例 ２ １）耐火治具：実施例１と同様にして製造した。Example 2 1) Fireproof jig: Manufactured in the same manner as in Example 1.
２）第１工程：比重１．６０の重クロム酸アンモニウム
の濃水溶液に、耐火治具を浸漬して含浸せしめ、９０℃
で４０分間乾燥し、ついで加熱炉にて４５０゛Ｃで土５
時間加熱処理する第１工程を２回繰返して施行した。2) First step: A refractory jig is immersed in a concentrated aqueous solution of ammonium dichromate with a specific gravity of 1.60, and heated to 90°C.
Dry for 40 minutes, then heat the soil at 450°C in a heating oven.
The first step of heat treatment was repeated twice.
２）第２工程：第１工程を終了した耐火治具を、比重１
，６５のクロム酸濃水溶液に浸漬してクロム酸を含浸せ
しめ、８０℃で１時間乾燥し、ついで５００゛Ｃて土５
時間加熱処理する第２工程を３回繰返し施行して、改質
された耐火治具を製造した。2) Second step: The fireproof jig that has completed the first step has a specific gravity of 1
, 65 to impregnate it with chromic acid, dried at 80°C for 1 hour, and then heated to 500°C to impregnate it with chromic acid.
The second step of time heat treatment was repeated three times to produce a modified refractory jig.
３）試験結果：実施例１と同様にして加熱−冷却の繰返
し試験を行なった結果、１５回の繰返し試験でスポーリ
ングの発生は皆無であり、浸炭現象も認められなかった
。3) Test results: As a result of repeated heating-cooling tests conducted in the same manner as in Example 1, no spalling occurred during the 15 repeated tests, and no carburization phenomenon was observed.
比較例
実施例１と同様に製造した耐火治具を、そのま２実施例
１と同様な加熱−冷却試験を行なった。その結果、３回
繰返し試験でスポーリングが発生し、６回で使用不能と
なった。なお、１回の試験で成熟処理物品である角状の
鉄パイプの耐火治具との接触部分には最大０．７ｍｍの
浸炭現象が見られ、硬さもＨＶ １３０程度であったも
のが３００以上まで上昇していた。Comparative Example A fireproof jig manufactured in the same manner as in Example 1 was subjected to the same heating-cooling test as in Example 2. As a result, spalling occurred after three repeated tests, and it became unusable after six tests. In addition, in one test, a carburization phenomenon of up to 0.7 mm was observed in the contact area with the refractory jig of a square iron pipe, which is a matured product, and the hardness was HV 300 or more, which was about HV 130. It had risen to.
（発明の効果）
本発明は、カーボン材からなる耐火治具に、水溶性クロ
ム化合物から加熱変換された不溶性クロム化合物によっ
て強化された硬化層を形成させた耐火治具であり、その
製造方法であるから、不溶性クロム化合物が開放気孔中
に充填され、カーボン自体の結合強度を強化した硬化層
を形成し得、耐摩耗性を向上し得、加熱炉のメツシュベ
ルトや物品との衝撃接触によっても容易に破壊摩耗を生
じることがなく、高温における酸化を防止でき、加熱−
冷却を繰返してもスポーリングをおこさず、耐久性を向
上すると共に、物品Ｉ＼の浸炭および浸炭に伴う硬さの
上昇や表面割れをも同時に防止し得るなどきわめて優れ
た効果が認められる。(Effects of the Invention) The present invention is a fireproof jig in which a hardened layer is formed on a fireproof jig made of a carbon material, and is reinforced with an insoluble chromium compound that is heat-converted from a water-soluble chromium compound. Because the insoluble chromium compound is filled into the open pores, it can form a hardened layer that strengthens the bonding strength of the carbon itself, which can improve wear resistance and easily resist impact contact with mesh belts of heating furnaces and articles. It does not cause destructive wear and prevents oxidation at high temperatures.
Even after repeated cooling, spalling does not occur, the durability is improved, and extremely excellent effects are recognized, such as being able to simultaneously prevent carburization of the article I\, and the increase in hardness and surface cracking that accompanies carburization.
特許出願人 臼井国際産業株式会社Patent applicant: Usui Kokusai Sangyo Co., Ltd.
Claims (2)
物によって強化された硬化層を形成してなることを特徴
とするカーボン材からなる改質された耐火治具。(1) A modified fireproof jig made of a carbon material, characterized in that a hardened layer reinforced with an insoluble chromium compound is formed on a fireproof jig made of a carbon material.
物の濃水溶液に含浸させた後、乾燥し、ついで３５０〜
６００℃に加熱する処理を少なくとも１回行ない、さら
に、クロム酸の濃水溶液に含浸させた後、乾燥し、つい
で３５０〜６００℃に加熱する処理を少なくとも１回行
なうことを特徴とするカーボン材からなる改質された耐
火治具の製造方法。(2) After impregnating a fireproof jig made of carbon material with a concentrated aqueous solution of a water-soluble chromium compound, it is dried, and then
A carbon material characterized by being heated at least once to 600°C, further impregnated with a concentrated aqueous solution of chromic acid, dried, and then heated at 350 to 600°C at least once. A method for manufacturing a modified fireproof jig.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1033219A JP2756998B2 (en) | 1989-02-13 | 1989-02-13 | Modified refractory jig made of carbon material and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1033219A JP2756998B2 (en) | 1989-02-13 | 1989-02-13 | Modified refractory jig made of carbon material and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02212385A true JPH02212385A (en) | 1990-08-23 |
| JP2756998B2 JP2756998B2 (en) | 1998-05-25 |
Family
ID=12380336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1033219A Expired - Lifetime JP2756998B2 (en) | 1989-02-13 | 1989-02-13 | Modified refractory jig made of carbon material and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2756998B2 (en) |
-
1989
- 1989-02-13 JP JP1033219A patent/JP2756998B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2756998B2 (en) | 1998-05-25 |
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