JPS63143207A - Production of stainless steel powder - Google Patents
Production of stainless steel powderInfo
- Publication number
- JPS63143207A JPS63143207A JP29067286A JP29067286A JPS63143207A JP S63143207 A JPS63143207 A JP S63143207A JP 29067286 A JP29067286 A JP 29067286A JP 29067286 A JP29067286 A JP 29067286A JP S63143207 A JPS63143207 A JP S63143207A
- Authority
- JP
- Japan
- Prior art keywords
- oxidation treatment
- molding
- sintering
- steel powder
- vacuum
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 16
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 9
- 239000010935 stainless steel Substances 0.000 title claims abstract description 4
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 238000005461 lubrication Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 abstract description 15
- 238000007254 oxidation reaction Methods 0.000 abstract description 15
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 238000000465 moulding Methods 0.000 abstract description 7
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 238000010348 incorporation Methods 0.000 abstract 1
- 230000001050 lubricating effect Effects 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はフェライト系ステンレス鋼粉末の焼結方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for sintering ferritic stainless steel powder.
（従来の技術）
従来フェライト系のステンレス鋼粉を焼結する場合、窒
化、浸炭による耐食性、磁気特性などの性質の劣化を避
けるために１Ｏ−２τｏｒｒ以下の真空中で焼結を実施
している。この場合、成形時の潤滑として型潤滑したも
のは直接真空焼結たはＮ２の保護雰囲気で加熱し、大気
中で行ったとしても ５００℃以下の低温で実施してい
た。(Prior art) Conventionally, when sintering ferritic stainless steel powder, sintering is carried out in a vacuum of 1O-2τorr or less to avoid deterioration of properties such as corrosion resistance and magnetic properties due to nitriding and carburization. . In this case, mold lubrication during molding was performed directly under vacuum sintering or heated in a protective atmosphere of N2, and even when performed in the air, it was performed at a low temperature of 500° C. or less.
（発明が解決しようとする問題点）
しかしながら、上記の従来技術に於ては、Ｏｒの蒸気圧
が高いため高温の真空中では表面からＣｒが相当量蒸発
飛散し、その結果耐食性にとって最も重要な表面のＣｒ
の濃度が低下し、製品の耐食性が低下するという欠点が
あった。(Problem to be solved by the invention) However, in the above-mentioned conventional technology, due to the high vapor pressure of Or, a considerable amount of Cr evaporates and scatters from the surface in a high-temperature vacuum, resulting in Cr on the surface
There was a drawback that the concentration of chloride was reduced, resulting in a reduction in the corrosion resistance of the product.
本発明は、このような従来技術の問題点を解決したもの
である。The present invention solves these problems of the prior art.
（問題点を解決するための手段〕
即ち、本発明は、フェライト系ステンレス鋼粉を潤滑後
、成形し、次いで４００乃至８００℃で１５分乃至１時
間酸化処理をした後、真空中で焼結することを特徴とす
る。(Means for Solving the Problems) That is, the present invention involves molding ferritic stainless steel powder after lubrication, oxidizing it at 400 to 800°C for 15 minutes to 1 hour, and then sintering it in a vacuum. It is characterized by
本発明に於てステンレス鋼粉の潤滑は金型潤滑または粉
末混入潤滑法によって行なわれる。In the present invention, lubrication of stainless steel powder is carried out by die lubrication or powder mixed lubrication.
そして、粉末混入潤滑法の場合は、酸化処理工程は、脱
ろう処理も兼ねている。In the case of the powder mixed lubrication method, the oxidation treatment process also serves as a dewaxing treatment.
本発明に於ては、酸化処理は、４００乃至８００℃、好
ましくは５００乃至６５０℃で、１５分乃至１時間実施
される。酸化処理温度が４００℃以下では酸化処理の効
果が不十分で、また粉末混入潤滑法では潤滑剤の脱ろう
が不十分となり、焼結時の炉、真空排気系への損傷及び
残留炭素が高くなり、耐食性の低下、および磁性劣化の
原因となる。また８００℃以上の高温で大気中で加熱し
た場合、酸化が著しく進行し、焼結体の形状精度が悪く
なる。酸化処理温度が４００乃至８００℃では上記した
問題は生じないが、より好ましくは ５００乃至８００
℃において安定した酸化被膜かえられる。In the present invention, the oxidation treatment is carried out at 400 to 800°C, preferably 500 to 650°C, for 15 minutes to 1 hour. If the oxidation treatment temperature is below 400℃, the effect of the oxidation treatment will be insufficient, and in the powder mixed lubrication method, the dewaxing of the lubricant will be insufficient, resulting in damage to the furnace and vacuum exhaust system during sintering, and high residual carbon. This causes a decrease in corrosion resistance and magnetic deterioration. Furthermore, when heated in the air at a high temperature of 800° C. or higher, oxidation progresses significantly and the shape accuracy of the sintered body deteriorates. The above problem does not occur when the oxidation treatment temperature is 400 to 800°C, but more preferably 500 to 800°C.
A stable oxide film is formed at ℃.
また焼結は１０５０℃以上の温度、好ましくは１１５０
℃以上の温度で実施される。The sintering is carried out at a temperature of 1050°C or higher, preferably 1150°C.
It is carried out at temperatures above ℃.
（作 用）
焼結前の酸化処理により粉末表面上にはＣｒの酸化物及
びＦｅの酸化物が形成されるが、Ｃｒ２Ｏ３の形成によ
り表面でＣｒ ａ度が富化し、また酸化処理により生ず
るＣｒ２Ｏ３及びＦｅ５０４又はＦｅ２Ｏ３の皮膜が真
空焼結工程でのＣｒの飛散を抑制する作用をする。(Function) Cr oxide and Fe oxide are formed on the powder surface by the oxidation treatment before sintering, but the Cr degree is enriched on the surface due to the formation of Cr2O3, and the Cr2O3 produced by the oxidation treatment The film of Fe504 or Fe2O3 acts to suppress scattering of Cr during the vacuum sintering process.
（実施例） 以下、実施例により本発明を説明する。(Example) The present invention will be explained below with reference to Examples.
５ＯＳ４３ＯＬ （Ｆｅ−７％Ｃ「−１％Ｓｉ）にアク
ラワックス１重量％を混粉（３０分）後、面圧６ ｔ
／ｃｍ’で円板（ｐ ３０ｍｍＸ １０ｍｍ厚さ）を成
形し、次いで、これを５５０℃で３０分間脱ろうを兼ね
て大気中で酸化処理した後、真空中（１０−’〜１０
Ｔｏｒｒ）で１２００℃の温度で１時間焼結を行った
。耐食性を比較するため、同様に混粉成形した円板をＮ
２雰囲気中で８００℃で３０分間脱ろう後、同様に真空
中で焼結を行った０両者についてＪＩＳＺ２３７Ｌの塩
水噴霧試験を実施し、１０サイクル経過した後の外観お
よび断面組織を比較した、その結果を表１に示す。After mixing 5OS43OL (Fe-7%C "-1%Si) with 1% by weight of Acra wax (30 minutes), the surface pressure was 6 t.
A disk (p 30 mm x 10 mm thick) was formed at a temperature of /cm', then oxidized in the air at 550°C for 30 minutes for dewaxing, and then oxidized in vacuum (10-'~10 mm).
Sintering was carried out at a temperature of 1200° C. for 1 hour. In order to compare the corrosion resistance, a disk molded in the same way with mixed powder was
2 After dewaxing at 800°C for 30 minutes in an atmosphere, sintering was performed in a vacuum in the same manner.A JIS Z237L salt spray test was conducted on both samples, and the appearance and cross-sectional structure after 10 cycles were compared. The results are shown in Table 1.
１゜
また上記本発明および従来法の焼結品について表面近傍
のＥＳＣＡ分析の結果を第１図に示す、第１図から本発
明では従来法に比較して明らかに脱Ｃｒ現象が抑制され
ていることがわかる。1゜ Figure 1 shows the results of ESCA analysis near the surface of the sintered products of the present invention and the conventional method. From Figure 1, it can be seen that the Cr removal phenomenon is clearly suppressed in the present invention compared to the conventional method. I know that there is.
（発明の効果）
本発明に於ては焼結前に酸化処理を施したことにより、
表面層にはＣｒの酸化物及びＦｅの酸化物が形成される
が、Ｃｒ２Ｏ３の形成は表面（１００λ以下）でのＣｒ
ａ度を富化し、また酸化処理により生ずるＣ ｒｚ
０３及びＦｅ３Ｏ４又はＦｅ２Ｏ３の皮膜が真空焼結工
程でのＣｒの蒸発飛散を抑制し、その結果耐食性の良い
焼結品が得られるという効果を奏する。(Effect of the invention) In the present invention, by performing oxidation treatment before sintering,
Cr oxide and Fe oxide are formed in the surface layer, but the formation of Cr2O3 is caused by Cr at the surface (below 100λ).
C rz enriched with a degree and also generated by oxidation treatment
The film of 03 and Fe3O4 or Fe2O3 suppresses the evaporation and scattering of Cr during the vacuum sintering process, resulting in the effect that a sintered product with good corrosion resistance can be obtained.
第１図は本発明による焼結品と従来法による焼結品につ
いてのＥＳＣＡ分析によるＣｒ ａ度の分布を示すグラ
フである。
特許出願久 トヨタ自動車株式会社
（ほか２名）
本発明
０ １，０ ２ρ ３．０
石井澄時間（ｍｉｎン
１ 図
役棗法
０ １．０ ２０ ３．０
石Ｗハ」３１間（ｍｉｎ）FIG. 1 is a graph showing the distribution of Cra degree by ESCA analysis of a sintered product according to the present invention and a sintered product according to a conventional method. Patent application period Toyota Motor Corporation (and 2 others) Invention 0 1,0 2ρ 3.0 Sumi Ishii time (min.
Claims (1)
処理をした後、真空中で焼結することを特徴とするステ
ンレス鋼粉末の焼結方法。[Claims] A method for sintering stainless steel powder, characterized in that ferritic stainless steel powder is molded after lubrication, then oxidized at 400 to 800°C for 15 minutes to 1 hour, and then sintered in vacuum. How to tie.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61290672A JPH0676604B2 (en) | 1986-12-06 | 1986-12-06 | Sintering method of stainless steel powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61290672A JPH0676604B2 (en) | 1986-12-06 | 1986-12-06 | Sintering method of stainless steel powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63143207A true JPS63143207A (en) | 1988-06-15 |
| JPH0676604B2 JPH0676604B2 (en) | 1994-09-28 |
Family
ID=17759000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61290672A Expired - Lifetime JPH0676604B2 (en) | 1986-12-06 | 1986-12-06 | Sintering method of stainless steel powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0676604B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525186A (en) * | 2015-12-22 | 2016-04-27 | 唐艺峰 | High-corrosion-resistance stainless steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56150155A (en) * | 1980-04-22 | 1981-11-20 | Sumitomo Electric Ind Ltd | Preparation of ferrous sintered material |
| JPS5792102A (en) * | 1980-11-27 | 1982-06-08 | Toshiba Corp | Production of ferrous sintered body |
-
1986
- 1986-12-06 JP JP61290672A patent/JPH0676604B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56150155A (en) * | 1980-04-22 | 1981-11-20 | Sumitomo Electric Ind Ltd | Preparation of ferrous sintered material |
| JPS5792102A (en) * | 1980-11-27 | 1982-06-08 | Toshiba Corp | Production of ferrous sintered body |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525186A (en) * | 2015-12-22 | 2016-04-27 | 唐艺峰 | High-corrosion-resistance stainless steel and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0676604B2 (en) | 1994-09-28 |
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