JPS6036441B2 - Method of lining high carbon iron-based materials with copper alloys - Google Patents
Method of lining high carbon iron-based materials with copper alloysInfo
- Publication number
- JPS6036441B2 JPS6036441B2 JP10546077A JP10546077A JPS6036441B2 JP S6036441 B2 JPS6036441 B2 JP S6036441B2 JP 10546077 A JP10546077 A JP 10546077A JP 10546077 A JP10546077 A JP 10546077A JP S6036441 B2 JPS6036441 B2 JP S6036441B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- copper alloy
- lining
- high carbon
- iron
- 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
Links
- 239000000463 material Substances 0.000 title claims description 39
- 229910000881 Cu alloy Inorganic materials 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 29
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 title claims description 12
- 239000000843 powder Substances 0.000 claims description 43
- 229910000679 solder Inorganic materials 0.000 claims description 20
- 239000011812 mixed powder Substances 0.000 claims 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 229910052742 iron Inorganic materials 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 229910000851 Alloy steel Inorganic materials 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229910000677 High-carbon steel Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000002860 competitive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 238000007751 thermal spraying Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000001996 bearing alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】
本発明は、高炭素鉄基材料に銅合金をラィニングする方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of lining a high carbon iron-based material with a copper alloy.
一般に、高炭素鉄基材料例えば高炭素鋼に鋼合金をラィ
ニングする方法としては、素材に銅合金を鋳込んでから
再溶解し、次いで冷却、凝固させてラィニングする方法
（再溶解法）、鋼合金を素材に肉盛り溶接してラィニン
グする方法（溶接法）、素材表面にショットブラストを
かけてからその表面に銅合金を溶射してラィニングする
方法（溶射法）、さらには素材表面に銅合金粉末を層状
に供給し、これを競結してラィニングする方法（糠結法
）等がある。In general, methods for lining high-carbon iron-based materials, such as high-carbon steel, with steel alloys include a method in which copper alloy is cast into the material, remelted, and then cooled and solidified for lining (remelting method); A method of overlaying an alloy onto a material and lining it (welding method), a method of shot blasting the surface of the material and then thermally spraying a copper alloy on the surface for lining (thermal spraying method), and a method of lining the surface of the material by welding a copper alloy. There is a method in which powder is supplied in a layered manner and the layers are bonded together to form a lining (branching method).
しかしながら、再溶解法では、合金中に酸化物を巻き込
んだり、偏折が生じたりする。However, the remelting method may involve oxides in the alloy or cause polarization.
溶接法の場合、合金が高温で溶融するため、揮発性成分
を含む鉛青銅などをラィニングするのには適していない
。同様に、溶射法も揮発性成分を含む鉛青銅などのラィ
ニングには適しない。また、溶射法では酸化物の巻込み
などが生じる危険もある。ところで、上誌の従来方法の
うち、競給法は、銅合金をラィニングする場合、合金の
強度、成分組織の均一性が得られ、さらに必要によりラ
ィニング層を多孔質にして含油性をもたせることができ
るなど、多くの優れた点を有する。しかし、このような
優れた利点を有しながらも、強度の大きい高炭素鋼へ煉
結法により銅合金をライニングしても接着力が弱く、特
に鋳鉄に対しては、ほとんど接着しないため、競緒法は
高炭素鉄基材料に対し十分実用化されていない現状であ
る。したがって、本発明の目的は、高炭素鉄基材料に暁
結法により銅合金をライニングする場合にみられる接着
力の各善を図り、従来擬結法によるラィニングができな
かった鋳鉄に対しても鋼合金のラィニングを可能とする
方法を提供することである。In the case of welding, the alloy melts at high temperatures, so it is not suitable for lining materials such as lead bronze, which contains volatile components. Similarly, thermal spraying is not suitable for lining materials containing volatile components such as lead bronze. Additionally, thermal spraying involves the risk of entrainment of oxides. By the way, among the conventional methods mentioned above, the competitive feeding method, when lining a copper alloy, can obtain the strength and uniformity of the composition of the alloy, and if necessary, make the lining layer porous to have oil impregnation. It has many advantages, such as the ability to However, even though it has these excellent advantages, even if copper alloy is lined with strong high carbon steel using the bridging method, the adhesive force is weak, and it hardly adheres to cast iron in particular, so it is not competitive. At present, this method has not been fully put into practical use for high-carbon iron-based materials. Therefore, an object of the present invention is to improve the adhesion strength observed when lining a high-carbon iron-based material with a copper alloy by the cold setting method, and also to improve the adhesion of cast iron, which could not be lined by the conventional pseudo setting method. The object of the present invention is to provide a method that allows lining of steel alloys.
本発明者らの知見によれば、鉄基材料中の炭素量が増え
るにつれて、素材と鋼合金粉末との漏れ性が悪くなり、
そのため接着力も弱くなる。According to the findings of the present inventors, as the amount of carbon in the iron-based material increases, the leakage between the material and the steel alloy powder becomes worse.
Therefore, the adhesive strength also becomes weak.
したがって、この漏れ性を改善するためには、例えば鋼
と反応性の強い亜鉛、リン等の元素を添加した合金の粉
末を利用することも考えられるが、必要な反応性を確保
するためには、それらの元素の添加量を多くしなければ
ならないが、一方それらの元素は得られる銅合金の機械
的特性を劣化させる不純物として作用するものであるた
め濃度は可及的に低く抑えなければならない。したがっ
て、上記のような元素を添加しても、濃度を高くするこ
とができないため、十分な反応性を得ることはできず、
したがって効果も十分ではない。ここに、本発明者らは
、上記の反応性の強い元素を適度に多く含む硬ろう粉末
をベースとなる銅合金粉末にわずかに少量だけ配合する
ことにより、予想外に反応性が改善され、鋳鉄に対して
も満足のゆく接着力が得られることを見し、出して、本
発明を完成した。Therefore, in order to improve this leakage, it is possible to use an alloy powder containing elements such as zinc and phosphorus, which are highly reactive with steel, but in order to ensure the necessary reactivity, However, since these elements act as impurities that degrade the mechanical properties of the resulting copper alloy, the concentration must be kept as low as possible. . Therefore, even if the above elements are added, the concentration cannot be increased and sufficient reactivity cannot be obtained.
Therefore, the effect is not sufficient. Here, the present inventors unexpectedly improved the reactivity by blending only a small amount of hard solder powder containing a moderately large amount of the above-mentioned highly reactive elements into the base copper alloy powder. They found that satisfactory adhesive strength could be obtained even on cast iron, and based on this, they completed the present invention.
かくして、本発明は、高炭素鉄基材料の表面上で硬ろう
粉末の存在下において鋼合金粉末の糠精を行なうことを
特徴とする。The invention is thus characterized by the brazing of steel alloy powders in the presence of hard solder powders on the surface of high-carbon iron-based materials.
高炭素鉄基材料へ鋼合金をラィニングする方法である。
上記硬ろう粉末の存在形態は、凝結すべき鋼合金粉末と
の混合物の形態であってもよく、あるいは、予め硬ろう
粉末を配合した銅合金粉末を、ライニングすべき材料表
面にのせ、次いでこの粉末層のうえに銅合金粉末をのせ
た形態であってもよい。It is a method of lining steel alloys into high carbon iron-based materials.
The hard solder powder may be in the form of a mixture with the steel alloy powder to be solidified, or the copper alloy powder mixed with the hard solder powder in advance is placed on the surface of the material to be lined, and then this A form in which copper alloy powder is placed on a powder layer may also be used.
以下、本明細書では便宜上これらをそれぞれ一層法、二
層法と称する。硬ろうは、高炭素鉄基材料および銅合金
に対する漏れ性がよく、銅合金粉末の凝結温度より低い
温度で融解するものであればいずれでもよく、かかる性
質を有するため銅合金粉末の競鯖に先立って溶融して鉄
基材料および縮合金の表面を漏らし、そのため節合金粉
末に少量添加するだけで、素材に対する銅合金の滞れ性
を大中に改善するものである。Hereinafter, in this specification, these methods will be referred to as a single-layer method and a two-layer method, respectively, for convenience. Any hard solder may be used as long as it has good leakage properties for high-carbon iron-based materials and copper alloys and melts at a temperature lower than the solidification temperature of copper alloy powder. It is melted in advance to leak through the surface of the iron-based material and condensation alloy, and therefore, just by adding a small amount to the nodule alloy powder, the stagnation of the copper alloy against the material can be greatly improved.
かかる硬ろう粉末としては銀ろう、リン鋼ろう、黄飾ろ
うなどの市販の硬ろう粉末が含まれる。Such hard solder powders include commercially available hard solder powders such as silver solder, phosphorus steel solder, and yellow-colored solder powder.
硬ろう粉末の添加量は、一層法の場合、銅合金粉末の混
合物に対し０．１〜５．値重量％であり、０．１重量％
より少ない場合には、橋炭素鉄基材料に対する銅合金粉
末の濡れ性改善に効果が十分でなく、一方、５．の重量
％を越えると銅合金自体の機械的特性を劣化させること
にある。In the case of a single layer method, the amount of hard solder powder added is 0.1 to 5. value weight%, 0.1% by weight
If the amount is less, the effect of improving the wettability of the copper alloy powder to the bridge carbon-iron base material will not be sufficient; on the other hand, 5. If the weight percentage exceeds , the mechanical properties of the copper alloy itself will deteriorate.
一般に、鉄基材料中の炭素量が増すにつれて、上記混合
物中の硬ろう粉末の配合量を増加させるのが好ましい。
二層法の場合、同様に０．１重量％以上の硬ろう粉末の
存在は必要であるが、上限は、硬ろう粉末含有量とその
うえに設ける銅合金粉末層との重量比によって決定され
るものであり、硬ろう粉末含有量が少ないとき（つまり
、厚さが薄いとき）には、硬ろう粉末の含有量は比較的
にその濃度を上げて１〜５重量％とするのがよい。しか
し、一般に材質面から可及的に配合量は少なくなる。な
お、本発明において高炭素鉄基材料は、高炭素鋼から鋳
鉄までの鉄基材料を包含するものであるが、一般に炭素
含量が０．２％上の鉄基材料の場合に銅合金との濡れ性
が低下するため、本発明は炭素０．２％以上を含む高炭
素鉄基材料のライニングに特に有効である。かくして、
本発明によれば、高炭素鉄基材料に対し、銅合金をラィ
ニングするに当り、両者の間の濡れ性を改善するために
、銅合金粉末に０．１〜５重量％の硬ろう粉末を添加す
るだけでよく、しかも上記含量の硬ろう粉末は暁結の完
了するまでに銅合金中に溶解拡散して均一となって材質
への影響は少ない。Generally, as the amount of carbon in the iron-based material increases, it is preferred to increase the amount of hard wax powder in the mixture.
In the case of the two-layer method, the presence of 0.1% by weight or more of hard solder powder is similarly necessary, but the upper limit is determined by the weight ratio of the hard solder powder content and the copper alloy powder layer provided thereon. When the content of the hard solder powder is small (that is, when the thickness is thin), the content of the hard solder powder is preferably relatively increased in concentration to 1 to 5% by weight. However, in general, the amount to be blended is as small as possible from the viewpoint of material quality. Note that in the present invention, high carbon iron-based materials include iron-based materials ranging from high carbon steel to cast iron, but generally, in the case of iron-based materials with a carbon content of 0.2% or more, it is difficult to combine them with copper alloys. The present invention is particularly useful for lining high carbon iron-based materials containing 0.2% or more carbon because of the reduced wettability. Thus,
According to the present invention, when lining a high carbon iron-based material with a copper alloy, 0.1 to 5% by weight of hard solder powder is added to the copper alloy powder in order to improve the wettability between the two. It is only necessary to add it, and the hard solder powder in the above content is dissolved and diffused into the copper alloy until the solidification is completed, so that it becomes uniform and has little effect on the material quality.
ラィニングされた鉄基材料の使用目的に応じて、例えば
軸受合金のような場合には鉄基材料上におかれた銅合金
粉末を競結したのち、糠結粉末の気孔率を下げるためプ
レスなどで加工したのち、さらに競結を繰返してもよい
。次に、実施例によって本発明をさらに説明する。実施
例 １，２
外径７仇舷？、厚さ５．５側の円板状のＪＩＳ・Ｓ３に
材に、脱炭処理等の前処理を施すことなく、脱脂後、表
１に示す鉛青銅粉末（ＬＢＣ−４）と１重量％銀ロウ粉
末（ＢＡｇ−７）との混合物、および鉛青銅粉末（ＬＢ
Ｃ−４）と１重量％（Ｃｕ−８％Ｐ）合金粉末との混合
物をそれぞれ厚さ１．７肌に一様に散布し、分解アンモ
ニアガス（比７０％、Ｎ２３０％）雰囲気中において８
１０℃で３０分間加熱し、鱗結した。Depending on the purpose of use of the lined iron-based material, for example, in the case of bearing alloys, the copper alloy powder placed on the iron-based material is bonded and then pressed to reduce the porosity of the brazed powder. After processing with , you may repeat the bidding process. Next, the present invention will be further explained by examples. Example 1, 2 Outer diameter 7 broadside? A disc-shaped JIS S3 material with a thickness of 5.5 was degreased without any pretreatment such as decarburization, and then 1% by weight of the lead bronze powder (LBC-4) shown in Table 1 was added. A mixture with silver wax powder (BAg-7) and lead bronze powder (LB
A mixture of C-4) and 1% by weight (Cu-8%P) alloy powder was uniformly sprinkled on the skin to a thickness of 1.7%, and heated to 8% by weight in an atmosphere of decomposed ammonia gas (70% ratio, 30% N2).
It was heated at 10° C. for 30 minutes to form scales.
次いで、競結合金層の密度を上げるために、２５０ナッ
クルプレス機を使ってプレスし、再び前記条件と同一条
件下で糠結を繰り返えした。得られた暁結層のせん断強
度を試験した結果は表２にまとめて示す。なお、硬ロウ
を含まない鉛青銅粉末（ＬＢＣ−４）のみの場合を比較
例１として示した。表１
表２
実施例 ３，４
Ｓ３＆材の代わりに灰鋳鉄（ＦＣ−２０）を使用して先
きの実施例を繰り返えした。Then, in order to increase the density of the competitive gold layer, it was pressed using a 250 knuckle press machine, and the brazing was repeated again under the same conditions as above. The results of testing the shear strength of the obtained Akatsuki formation are summarized in Table 2. Note that Comparative Example 1 is a case in which only leaded bronze powder (LBC-4) containing no hard solder is used. Table 1 Table 2 Examples 3, 4 The previous examples were repeated using gray cast iron (FC-20) instead of S3& material.
得られた焼結層の鱗断強度を表３にまとめて示す。なお
、ＬＢＣ−４粉末のみの場合を比較例２として示した。
表３実施例 ５，６
実施例１，２と同一の高炭素鉄基材料を用い、その表面
に表１に示す鉛青銅粉末（ＬＢＣ−４）と３重量％銀ロ
ウ粉末（ＢＡｇ−７）との混合物、および鉛青銅粉末（
ＬＢＣ−４）と３重量％（Ｃｕ−８％Ｐ）合金粉末との
混合物をそれぞれ厚さ０．３肌に一様に散布し、更にこ
れらの上に鉛青銅粉末（ＬＢＣ−４）を重ねて全体の厚
さが１．７側になるように散布した。The scale strength of the obtained sintered layer is summarized in Table 3. In addition, the case where only LBC-4 powder was used was shown as Comparative Example 2.
Table 3 Examples 5 and 6 The same high carbon iron-based material as in Examples 1 and 2 was used, and the lead bronze powder (LBC-4) shown in Table 1 and 3% by weight silver wax powder (BAg-7) were applied to the surface. mixtures with, and leaded bronze powder (
A mixture of LBC-4) and 3% by weight (Cu-8%P) alloy powder was uniformly sprinkled on the skin to a thickness of 0.3 cm, and lead bronze powder (LBC-4) was further layered on top of these. It was spread so that the total thickness was on the 1.7 side.
次いで実施例１，２と同一条件で暁結およびプレス加工
を行った。得られた雛絹層の雛断強度を表４にまとめて
示す。表４
表２、表３および表４に示す結果からも分かるように、
本発明においては銅合金粉末に徴量の硬ロゥ粉末を添加
するだけで素材との接着力を向上させることができると
ともに、単味の銅合金粉末では素材に脱炭処理等の前処
理を施さない限り接着させることのできない鋳鉄に対し
ても十分な接着力でもつて鋼合金暁結層のラィニングを
することができる。Next, forming and pressing were performed under the same conditions as in Examples 1 and 2. Table 4 summarizes the chick breaking strength of the obtained chick silk layer. Table 4 As can be seen from the results shown in Tables 2, 3, and 4,
In the present invention, it is possible to improve the adhesion to the material simply by adding a certain amount of hard wax powder to the copper alloy powder. Even for cast iron, which cannot otherwise be bonded, it is possible to apply a steel alloy lining with sufficient adhesion.
以上の本発明についての説明からも理解されるように、
本発明方法に従えば、鋼合金でラィニングするに際し、
素材を加熱水蒸気にあてたり、ショットブラストにかけ
るなどの脱炭処理あるいは表面処理が必要でなく、した
がってそのための設備が不要となりしかも工程数が削減
できるなどの利益がみられる。As understood from the above description of the present invention,
According to the method of the present invention, when lining with steel alloy,
There is no need for decarburization or surface treatment such as subjecting the material to heated steam or shot blasting, so there are benefits such as eliminating the need for such equipment and reducing the number of steps.
Claims (1)
．０重量％含む銅合金混合粉末を存在せしめて銅合金混
合粉末を焼結することを特徴とする、高炭素鉄基材料へ
銅合金をライニングする方法。 ２ 高炭素鉄基材料の表面上に硬ろう粉末を０．１〜５
．０重量％含む銅合金混合粉末を存在せしめ、次いでこ
の混合粉末層の上に銅合金粉末層をのせて粉末層を２層
にした後、これらの粉末層を焼結することを特徴とする
、高炭素鉄基材料へ銅合金をライニングする方法。[Claims] 1. 0.1 to 5% of hard solder powder is applied on the surface of the high carbon iron-based material.
．． A method for lining a high carbon iron-based material with a copper alloy, characterized in that the copper alloy mixed powder is sintered in the presence of a copper alloy mixed powder containing 0% by weight. 2 Apply 0.1 to 5% hard solder powder on the surface of high carbon iron-based material.
．． A copper alloy mixed powder containing 0% by weight is present, and then a copper alloy powder layer is placed on top of this mixed powder layer to form two powder layers, and then these powder layers are sintered. A method for lining high carbon iron-based materials with copper alloys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10546077A JPS6036441B2 (en) | 1977-09-02 | 1977-09-02 | Method of lining high carbon iron-based materials with copper alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10546077A JPS6036441B2 (en) | 1977-09-02 | 1977-09-02 | Method of lining high carbon iron-based materials with copper alloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5439308A JPS5439308A (en) | 1979-03-26 |
| JPS6036441B2 true JPS6036441B2 (en) | 1985-08-20 |
Family
ID=14408183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10546077A Expired JPS6036441B2 (en) | 1977-09-02 | 1977-09-02 | Method of lining high carbon iron-based materials with copper alloys |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6036441B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188707A (en) * | 1986-02-14 | 1987-08-18 | Yoshinobu Kobayashi | Hard facing method for integrally forming sintered hard layer on surface of ferrous metallic sheet |
| JP5031548B2 (en) * | 2007-12-28 | 2012-09-19 | 住友重機械工業株式会社 | Cryopump |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4716864Y1 (en) * | 1969-12-22 | 1972-06-13 | ||
| JPS50122977U (en) * | 1974-03-23 | 1975-10-07 |
-
1977
- 1977-09-02 JP JP10546077A patent/JPS6036441B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5439308A (en) | 1979-03-26 |
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