JPH0463202A - Manufacture of stainless steel sintered body - Google Patents
Manufacture of stainless steel sintered bodyInfo
- Publication number
- JPH0463202A JPH0463202A JP17478690A JP17478690A JPH0463202A JP H0463202 A JPH0463202 A JP H0463202A JP 17478690 A JP17478690 A JP 17478690A JP 17478690 A JP17478690 A JP 17478690A JP H0463202 A JPH0463202 A JP H0463202A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- sintered body
- stainless steel
- sintering
- rust
- 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.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 16
- 239000010935 stainless steel Substances 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000011812 mixed powder Substances 0.000 claims abstract description 5
- 150000004820 halides Chemical class 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 13
- 239000011247 coating layer Substances 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000026030 halogenation Effects 0.000 abstract 2
- 238000005658 halogenation reaction Methods 0.000 abstract 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 abstract 1
- 235000019270 ammonium chloride Nutrition 0.000 abstract 1
- 238000009792 diffusion process Methods 0.000 description 19
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 101150059114 CAPN8 gene Proteins 0.000 description 2
- 102100030004 Calpain-8 Human genes 0.000 description 2
- 101100459899 Oryza sativa subsp. japonica NCL2 gene Proteins 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000004067 bulking agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】 一肌辺旦酌 ［産業上の利用分野］ 本発明はステンレス焼結体の製造方法に関する。[Detailed description of the invention] Ishadabe Danshu [Industrial application field] The present invention relates to a method for manufacturing a stainless steel sintered body.
［従来技術］
従来、ステンレス鋼の粉末をプレス成形等にて所望の形
状に成形し、この成形体を高真空（１〇−３〜１０−’
Ｔｏｒｒ以下）で焼結することにより、ステンレス焼結
体を製造していた
［発明が解決しようとする課題］
しかし、従来の製造方法で製造したステンレス焼結体（
よ なぜか腐食し易く、錆が発生するという問題があっ
た。[Prior Art] Conventionally, stainless steel powder is molded into a desired shape by press molding or the like, and this molded body is heated under high vacuum (10-3 to 10-'
[Problem to be solved by the invention] However, stainless steel sintered bodies manufactured by conventional manufacturing methods (
For some reason, there was a problem with it being easily corroded and causing rust.
こうした錆の発生する原因は定かではないが、本発明者
らが種々検討したところ、焼結時にＣｒの蒸発があるた
めではないかと考える。Although the cause of such rust is not certain, the inventors of the present invention have conducted various studies and believe that it is due to the evaporation of Cr during sintering.
そこで、本発明者らは、この問題を解決し、錆の発生し
ないステンレス焼結体の製造方法を提供することを目的
として本発明を完成した。Therefore, the present inventors completed the present invention with the aim of solving this problem and providing a method for manufacturing a stainless steel sintered body that does not generate rust.
聚哩の退域
［課題を解決するための手段］
かかる目的を達成するためになされた本発明のステンレ
ス焼結体の製造方法においては、ステンレス鋼粉末から
成形した成形体を、Ｃｒとハロゲン化物の混合粉末中に
埋没させて焼結することを特徴とする。[Means for solving the problem] In the method for manufacturing a stainless steel sintered body of the present invention, which has been made to achieve the above object, a molded body formed from stainless steel powder is treated with Cr and halide. It is characterized by being embedded in a mixed powder and sintered.
［作用］
本発明のステンレス焼結体の製造方法によれば、焼結の
際にＣｒとハロゲン化物の混合粉末中に成形体を埋没さ
せて焼結することにより、焼結体にＣｒの拡散被覆層が
形成される。この結果、焼結体の耐食性が向上する。[Function] According to the method for manufacturing a stainless steel sintered body of the present invention, by embedding the compact in a mixed powder of Cr and halide and sintering it during sintering, Cr is diffused into the sintered body. A covering layer is formed. As a result, the corrosion resistance of the sintered body is improved.
二の拡散被覆層を形成する反応をハロゲン化物としてＮ
Ｈ４ＣＱを例に考察すると、以下の様になる。The reaction to form the second diffusion coating layer is carried out using N as a halide.
Taking H4CQ as an example, the following is true.
ＮＨ４Ｃ（Ｉｔ −ＮＨ３＋ＨＣｌ２Ｃｒ＋２Ｈ
ＣＱ Ｈ２＋ＣｒｃＱ２ＣｒＣＱ２ ＋Ｆｅ −
ＦｅＣＱ２ ＋Ｃｒこの結果、焼結体表面では、Ｆｅが
Ｃｒに置換されて拡散が進行する。また、この他にも次
の様な反応も行われる。NH4C(It −NH3+HCl2Cr+2H
CQ H2+CrcQ2CrCQ2 +Fe −
FeCQ2 +Cr As a result, Fe is replaced with Cr on the surface of the sintered body, and diffusion progresses. In addition to this, the following reactions are also performed.
Ｆ ｅ ＋２ ＨＣＱ Ｈ２＋ Ｆ ｅ ＣＱ
２ＣｒｃＱ２＋Ｈ２２ＨＣ＆！十Ｃｒ
ＣｒＣＱ２ ＣＬ＋Ｃｒ
これらの反応を通じて出て来るＣｒが焼結体の表面を被
覆する。F e +2 HCQ H2+ F e CQ
2CrcQ2+H22HC&! 10Cr CrCQ2 CL+Cr Cr released through these reactions covers the surface of the sintered body.
こうした反応の結果、ステンレス焼結体の表面にはＣｒ
拡散被覆層が形成さ札耐食性が向上する。従って、本発
明の方法により製造されたステンレス焼結体には錆が発
生しない。As a result of these reactions, the surface of the stainless steel sintered body has Cr.
A diffusion coating layer is formed to improve the corrosion resistance of the tag. Therefore, rust does not occur in the stainless steel sintered body produced by the method of the present invention.
［実施例］ 次に、実施例について説明する。[Example] Next, examples will be described.
まず、５ＵＳ３１６Ｌ鋼粉末（−１００ｍｅｓｈ）に潤
滑剤としてステアリン酸亜鉛１ｗｔ％を混合し、成形圧
５ ｔｏｎ／ａｎ２でプレス成形して、３０ｍｍＸ１２
ｎｖｎＸ５ｍｍの直方体状の成形体を製造した。First, 5US316L steel powder (-100mesh) was mixed with 1wt% zinc stearate as a lubricant, and press-molded at a molding pressure of 5 ton/an2 to form a 30mm x 12
A rectangular parallelepiped molded body with nvn×5 mm was produced.
次に、この成形体をＣｒ粉末（−２００ｍｅｓｈ）と、
ＡＱ２０３粉末 （１８０ｍｅｓｈ） と、ＮＨａ
ＣＱ粉末（−２００ｍｅ ｓ ｈ）とを５＝５：］の割
合で混合した拡散処理剤中へ埋め込んで、まず５００”
Ｃで３０分間加熱して脱ろうした後に、１０−３〜１０
−’Ｔｏｒｒの高真空で１２００６Ｃ×１時間の焼結を
行なって焼結体を得た なお、脱ろうのときも高真空状
態としている。Next, this molded body was mixed with Cr powder (-200mesh),
AQ203 powder (180mesh) and NHa
First, 500"
After dewaxing by heating at C for 30 minutes, 10-3 to 10
A sintered body was obtained by sintering at 12006C for 1 hour in a high vacuum of -' Torr.The high vacuum condition was also used during dewaxing.
一方、成形体をそのままで脱ろう処理し、］２２００°
Ｃ１１時の真空焼結を行なって焼結体を得たものと、さ
らにこの後で上述の拡散剤中へ埋没して加熱して拡散処
理を行ったものとを比較例とした。On the other hand, the molded body was subjected to dewaxing treatment as it was, and
Comparative examples include a sintered body obtained by performing vacuum sintering at C11, and a sintered body obtained by further immersing the sintered body in the above-mentioned diffusing agent and performing a diffusion treatment by heating.
こうして製造した実施例及び比較例の焼結体に対して「
塩水噴霧試験（Ｊ ＋５−２２３７１）Ｊを９６時間実
施して錆の発生状況を調べた なお、途中の２４時間、
４８時間、７２時間においても錆の発生状況を確認した
５ＵＳ３１６Ｌ鋼の化学成分を第１表に、塩水噴霧試験
の結果を第２表に示す。For the sintered bodies of Examples and Comparative Examples manufactured in this way,
Salt spray test (J +5-22371) J was carried out for 96 hours to investigate the occurrence of rust.
Table 1 shows the chemical composition of the 5US316L steel, which was confirmed to be rusty even after 48 hours and 72 hours, and Table 2 shows the results of the salt spray test.
第１表
第２表
Ｏ
２、０５
ここで、第２表の判定における記号Ａ、 Ｂ、 Ｃ
は目視による錆の発生状況を表し、記号Ａは「錆の発生
なし」を、記号Ｂは「錆が少し発生（面積比１０〜２０
％程度）」を、記号Ｃは「錆がかなり発生（面積比５０
％程度）」を意味する。Table 1 Table 2 O 2, 05 Here, the symbols A, B, C in the judgment of Table 2
Symbol A indicates "no rust" and symbol B indicates "slight rust (area ratio 10 to 20)".
%)", and symbol C indicates "considerable rust (area ratio: 50%)".
(approximately %).
試験の結果、実施例（Ｎｃｌ）ｉｔ、９６時間経過にお
いても目視観察での錆の発生は全く認められなかった
これに対し、真空焼結による比較例（Ｎ１１３）では
２４時間経過の時点から錆の発生が認めら札 ９６時間
経過のときには、かなりの量の錆となっていた また、
焼結後に拡散処理をした比較例（Ｎｏ、２）でも、９６
時間のときに錆の発生が確認された
この様に、実施例では、拡散処理剤中に埋没させてＣｒ
拡散被覆処理を行うことで、焼結体表面にＣｒ拡散被覆
層が形成さね耐食性が著しく向上した。ところで、拡散
被覆処理という観点でいえｆｉＮｃｔ２のものも同じで
あるが、耐食性ではＮα］のものとは差が生じｆ−。As a result of the test, in Example (Ncl)it, no rust was observed by visual observation even after 96 hours.
On the other hand, in the comparative example (N113) by vacuum sintering,
No rust was observed after 24 hours. By the time 96 hours had passed, there was a considerable amount of rust.
Even in the comparative example (No. 2) in which diffusion treatment was performed after sintering, 96
In this way, the generation of rust was confirmed when the Cr was buried in the diffusion treatment agent.
By performing the diffusion coating treatment, a Cr diffusion coating layer was formed on the surface of the sintered body, and the corrosion resistance was significantly improved. By the way, fiNct2 is the same in terms of diffusion coating treatment, but there is a difference in corrosion resistance from Nα] f-.
そこで、この点について、Ｃｒ拡散被覆層の状況を調べ
るために、Ｎα１，２のそれぞれの焼結体を切断し、断
面に対してエレクトロプローブマイクロアナライザ（Ｅ
ＰＭＡ）を用いてＣｒ濃度の分析を行った
Ｎｃｔｌの分析結果を第１図に、ＮＣＬ２の分析結果を
第２図に示す。Therefore, in order to investigate the state of the Cr diffusion coating layer, we cut each of the sintered bodies of Nα1 and Nα2, and measured the cross section using an electroprobe microanalyzer (E
Figure 1 shows the analysis results of Nctl, and Figure 2 shows the analysis results of NCL2, in which the Cr concentration was analyzed using PMA).
図示の様に、Ｎα１のものでＩＬＣｒ濃度は表面近傍で
ピークを迎え、その後なだらかに減少して内部へいくと
約２０％程度に収束して均一層をなしていた。表面のＣ
ｒ拡散被覆層についていうと、Ｃｒ濃度３０％以上の層
が約２０μｍ程度の深さで形成されていることが分かる
。また、どの部分のＣｒ濃度も、均一層の濃度（約２０
％）以下とはなっていない。As shown in the figure, in the case of Nα1, the ILCr concentration reached a peak near the surface, then gradually decreased and converged to about 20% inward, forming a uniform layer. C on the surface
Regarding the r-diffusion coating layer, it can be seen that a layer with a Cr concentration of 30% or more is formed at a depth of about 20 μm. In addition, the Cr concentration in any part is the same as that of the uniform layer (approximately 20
%) or less.
これに対し、Ｎα２のものでは、表面のＣｒ拡散被覆層
はＮα１と対して変わりないが、この拡散被覆層から均
一層への境界が明確に現ね しかもこの部分で均一層の
Ｃｒ濃度よりも濃度の低い部分が形成されていることが
分かる。On the other hand, in the case of Nα2, the Cr diffusion coating layer on the surface is unchanged from that of Nα1, but the boundary from this diffusion coating layer to the uniform layer clearly appears. It can be seen that a region with low concentration is formed.
このことから、ＮＣＬ２やＮα３のものでは焼結の際二
、表面近傍のＣｒが蒸発して一旦Ｃｒ濃度が低くなって
いるものと考えられる。そして、こうした焼結の際のＣ
ｒ蒸発の影響を除去するには、後で拡散被覆処理をした
としても完全な対策とはならないことが分かる。From this, it is considered that in the case of NCL2 and Nα3, Cr near the surface evaporates during sintering, and the Cr concentration becomes low once. And, during such sintering, C
It can be seen that even if a diffusion coating treatment is performed afterwards, it is not a complete measure to eliminate the influence of r evaporation.
以上説明した様に、Ｃｒ拡散被覆処理のための拡散処理
剤中１：成形体を埋没させて焼結することにより、従来
の方法により製造された焼結体に比較して耐食性の格段
に優れた焼結体を得ることができる。そして、単なる拡
散被覆処理ではなく、焼結時に同時に拡散被覆処理を施
すという構成が、層よい結果を奏する。As explained above, diffusion treatment agent 1 for Cr diffusion coating treatment: By embedding and sintering the molded body, the corrosion resistance is significantly superior to that of the sintered body manufactured by the conventional method. A sintered body can be obtained. Moreover, a configuration in which the diffusion coating treatment is performed at the same time as the sintering process, rather than a simple diffusion coating treatment, produces better results.
以上本発明の詳細な説明したが、本発明はこれらに限定
されるものではなく、その要旨を逸脱しない範囲の種々
なる態様で実施することができることはいうまでもない
。Although the present invention has been described above in detail, it goes without saying that the present invention is not limited thereto and can be implemented in various forms without departing from the spirit thereof.
例え１瓜 マルテンサイト系ステンレス鋼やフェライト
系ステンレス鋼についても本発明を適用し得る。For example, the present invention can also be applied to martensitic stainless steel and ferritic stainless steel.
また、拡散剤中のＡＥ２２０３粉末（よ単なる増量剤あ
るいは調整剤であって、直接の反応に影響するものでは
ない。従って、これは必須要件ではない。また、Ａ１２
２０３以外のものでもよく、ＺｒＯ２やＳ ＋ ０２、
その他ガラス粉末等であってもよい。Also, AE2203 powder in the diffusing agent (it is just a bulking agent or modifier and does not directly affect the reaction. Therefore, this is not an essential requirement. Also, A12
Materials other than 203 may be used, such as ZrO2, S + 02,
Other materials such as glass powder may also be used.
さらに、ＮＨＡ ＣＱに代えて他のハロゲン化物の粉末
とＣｒ粉末とを混合する構成であっても構わない。Furthermore, instead of NHA CQ, a configuration may be adopted in which powder of another halide and Cr powder are mixed.
また、焼結時の雰囲気としては、真空に限らず、例えば
Ｈ２雰囲気でも構わない。酸化が起こらない雰囲気であ
ればよいのである。Further, the atmosphere during sintering is not limited to vacuum, and may be, for example, an H2 atmosphere. Any atmosphere that does not cause oxidation is sufficient.
発明の効果
本発明のステンレス焼結体の製造方法によれば、Ｃｒと
ハロゲン化物との混合粉末中に埋没させて焼結をするこ
とによって、焼結体の表面には良好なＣｒ拡散被覆層が
形成され、耐食性を向上させることができ、錆の発生し
ない優れた焼結製品を簡単に製造することができる。Effects of the Invention According to the method for producing a stainless steel sintered body of the present invention, a good Cr diffusion coating layer is formed on the surface of the sintered body by embedding it in a mixed powder of Cr and a halide and sintering it. is formed, corrosion resistance can be improved, and excellent rust-free sintered products can be easily produced.
第１図は実施例の焼結体のＣｒ濃度分析の結果を示すグ
ラフ、第２図は比較例の焼結体のＣ「濃度分析の結果を
示すグラフである。FIG. 1 is a graph showing the results of Cr concentration analysis of the sintered body of the example, and FIG. 2 is a graph showing the results of C concentration analysis of the sintered body of the comparative example.
Claims (1)
ロゲン化物の混合粉末中に埋没させて焼結することを特
徴とするステンレス焼結体の製造方法。1. A method for manufacturing a stainless steel sintered body, which comprises embedding a molded body formed from stainless steel powder in a mixed powder of Cr and a halide and sintering it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17478690A JPH0463202A (en) | 1990-07-02 | 1990-07-02 | Manufacture of stainless steel sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17478690A JPH0463202A (en) | 1990-07-02 | 1990-07-02 | Manufacture of stainless steel sintered body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0463202A true JPH0463202A (en) | 1992-02-28 |
Family
ID=15984647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17478690A Pending JPH0463202A (en) | 1990-07-02 | 1990-07-02 | Manufacture of stainless steel sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0463202A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020527191A (en) * | 2017-07-13 | 2020-09-03 | フォルシュングスツェントルム・ユーリッヒ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Sintering methods for metals, non-oxide ceramics and other oxidation sensitive materials |
-
1990
- 1990-07-02 JP JP17478690A patent/JPH0463202A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020527191A (en) * | 2017-07-13 | 2020-09-03 | フォルシュングスツェントルム・ユーリッヒ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Sintering methods for metals, non-oxide ceramics and other oxidation sensitive materials |
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