JPS63130744A - Manufacture of sintered stainless steel - Google Patents
Manufacture of sintered stainless steelInfo
- Publication number
- JPS63130744A JPS63130744A JP27920686A JP27920686A JPS63130744A JP S63130744 A JPS63130744 A JP S63130744A JP 27920686 A JP27920686 A JP 27920686A JP 27920686 A JP27920686 A JP 27920686A JP S63130744 A JPS63130744 A JP S63130744A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- vapor
- alloy powder
- sintering
- sintered
- 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 30
- 239000010935 stainless steel Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 26
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims abstract description 14
- 229910052804 chromium Inorganic materials 0.000 claims description 25
- 239000011651 chromium Substances 0.000 claims description 25
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 24
- 238000000465 moulding Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 18
- 238000005260 corrosion Methods 0.000 abstract description 18
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000005507 spraying Methods 0.000 abstract description 5
- -1 this Substances 0.000 abstract description 4
- 230000008020 evaporation Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 abstract description 2
- 150000001247 metal acetylides Chemical class 0.000 abstract 1
- 239000000463 material Substances 0.000 description 15
- 150000003839 salts Chemical class 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000599 Cr alloy Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- GVEHJMMRQRRJPM-UHFFFAOYSA-N chromium(2+);methanidylidynechromium Chemical compound [Cr+2].[Cr]#[C-].[Cr]#[C-] GVEHJMMRQRRJPM-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229910003470 tongbaite Inorganic materials 0.000 description 3
- 230000004584 weight gain Effects 0.000 description 3
- 235000019786 weight gain Nutrition 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000000788 chromium alloy Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910018663 Mn O Inorganic materials 0.000 description 1
- 229910003176 Mn-O Inorganic materials 0.000 description 1
- 229910017263 Mo—C Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は焼結ステンレス鋼の製造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing sintered stainless steel.
近年、ステンレス鋼組成を有する合金粉が噴霧法により
工業的に量産されるようになり、このステンレス鋼合金
粉を焼結した焼結ステンレス鋼が実用化されるに至った
。この焼結ステンレス鋼はクロム及びニッケルを多く含
有するため、従来のＦｅ −Ｃｕ −０系、Ｆｅ −Ｎ
ｉ −Ｍｏ −Ｃ！ｕ −０系、及びＦｅ −Ｍｎ−Ｏ
ｒ −Ｍｏ −０系等の焼結鋼に比べ耐食性に優れてい
る。In recent years, alloy powder having a stainless steel composition has been industrially mass-produced by a spraying method, and sintered stainless steel obtained by sintering this stainless steel alloy powder has come into practical use. This sintered stainless steel contains a large amount of chromium and nickel, so it
i-Mo-C! u-0 system, and Fe-Mn-O
It has superior corrosion resistance compared to sintered steels such as r-Mo-0 series.
しかし、焼結ステンレス鋼も同一組成の溶製鋼材と比較
すると、空孔が残存するために表面積が大キく、耐食性
に劣るとされていた。However, when compared with molten steel of the same composition, sintered stainless steel has a larger surface area due to remaining pores, and is considered to have inferior corrosion resistance.
か＼る焼結ステンレス鋼の耐食性を改善するために、空
孔を樹脂や水ガラスで封孔する方法又は熱間鍛造やフィ
ニングにより空孔を減少させる方法が試みられてきた。In order to improve the corrosion resistance of sintered stainless steel, attempts have been made to seal the pores with resin or water glass, or to reduce the pores by hot forging or finning.
しかし、前者の方法では、焼結ステンレス鋼が使用中に
劣化したり機械的破損や剥離等が生じ信頼性に乏しく、
工程も繁雑で経済性に劣っていた。又、後者の方法では
、空孔率を顕著に低下させることができず、耐食性向上
効果が少ないうえ、塑性加工を経る為に経済性に劣って
いた。However, in the former method, the sintered stainless steel deteriorates during use, and suffers from mechanical damage and peeling, resulting in poor reliability.
The process was complicated and uneconomical. Furthermore, in the latter method, the porosity could not be significantly lowered, the effect of improving corrosion resistance was small, and the process involved plastic working, which resulted in poor economic efficiency.
本発明は、かかる従来の事情に鑑み、同一組成の溶製鋼
材とほぼ等しい優れた耐食性？有する焼結ステンレスｌ
を製造する方法を提供することを目的としている。In view of such conventional circumstances, the present invention provides excellent corrosion resistance that is almost equal to that of molten steel of the same composition. Sintered stainless steel with
The purpose is to provide a method for manufacturing.
本発明の焼結ステンレス鋼の製造方法は、ステンレス鋼
合金粉を成形し、この成形体を減圧雰囲気中においてク
ロム蒸気の存在下で焼結することを特徴とする。The method for producing sintered stainless steel of the present invention is characterized by molding stainless steel alloy powder and sintering the molded body in the presence of chromium vapor in a reduced pressure atmosphere.
クロム蒸気を供給する手段としては、ステンレス鋼合金
粉よりもクロム濃度が高いか又はクロム蒸気圧が大きい
（クロム活量が大キい）クロム源を、減圧雰囲気下に焼
結と同時に加熱してクロム蒸気を発生させる方法が簡単
であって、しがも好ましい。クロム源として、具体的に
はクロム又はクロム合金の粉末若しくは板等を用いるこ
とができ、クロム合金としては安価なＦｅ −６０重量
％Ｃｊｒ合金が好ましい。又、板等を用いる場合にはク
ロムメッキを施したものであっても良い。As a means of supplying chromium vapor, a chromium source with a higher chromium concentration or chromium vapor pressure (higher chromium activity) than stainless steel alloy powder is heated at the same time as sintering in a reduced pressure atmosphere. A method of generating chromium vapor is simple and therefore preferred. Specifically, a powder or plate of chromium or a chromium alloy can be used as the chromium source, and an inexpensive Fe-60% by weight Cjr alloy is preferable as the chromium alloy. Further, when a plate or the like is used, it may be plated with chrome.
これらクロム源の用い方として、この粉末中にステンレ
ス鋼合金粉成形体を埋めたり、この板上に上記成形体を
載せる等、両者を接触させた状態で焼結する場合には、
クロム源と成形体ないし焼結体とが焼結時に固着しない
ように、クロム源の粉末にアルミナ等のセラミック粉末
と混合して使用し、また板と上記成形体との間にセラミ
ック粉末を介在させて使用する必要がある。When using these chromium sources, when sintering them in a state where they are in contact, such as by burying a stainless steel alloy powder compact in this powder or placing the above compact on a plate,
To prevent the chromium source and the compact or sintered body from sticking together during sintering, the chromium source powder is mixed with a ceramic powder such as alumina, and the ceramic powder is interposed between the plate and the compact. It is necessary to use it.
尚、発生したクロム蒸気を有効に使用するため及び炉内
の汚染防止の為クロム源とステンレス鋼合金粉成形体は
蓋付き容器等に収納し、半密閉状態で焼結することが好
ましい。In order to effectively use the generated chromium vapor and to prevent contamination within the furnace, it is preferable that the chromium source and the stainless steel alloy powder compact be stored in a container with a lid, etc., and sintered in a semi-closed state.
本発明者等は、焼結ステンレス鋼の耐食性が劣化する原
因を種々調査した結果、空孔率以外に下記の事実が解っ
た。第１に、噴霧法により製造したステンレス鋼合金粉
の表面にクロム炭化物が生成し、このクロム炭化物が焼
結後もＰｒｉｍａｒｙ Ｐａｒ−ｔｉｃ７ｅ Ｂｏｕｎ
ｄａｒｙとして焼結ステンレス鋼中に残って粒界腐食の
原因となっている。また第２の原因として、真空又は減
圧下での焼結によってクロムが蒸発し、焼結ステンレス
鋼表面の緻密なりロム酸化物被膜がなくなること、等が
解った。The present inventors investigated various causes of deterioration of corrosion resistance of sintered stainless steel, and as a result, in addition to porosity, the following facts were discovered. First, chromium carbide is generated on the surface of the stainless steel alloy powder produced by the spraying method, and this chromium carbide remains in the Primary Par-tic7e Boun even after sintering.
It remains as a dary in the sintered stainless steel and causes intergranular corrosion. It has also been found that the second cause is that chromium evaporates due to sintering under vacuum or reduced pressure, resulting in the densification of the sintered stainless steel surface and the disappearance of the chromium oxide film.
そこで本発明においては、減圧雰囲気中で焼結すること
によってステンレス鋼合金粉の表面のクロム炭化物を還
元し、同時に焼結の際にクロム蒸気を供給して表面から
のクロムの蒸発を防止し又は表面にクロムを蒸着させる
。クロム炭化物の還元のために必要な減圧の程度は２×
１０″ｔｏｒｒ以下の圧力であり、クロム源の量は焼結
の間クロム蒸気を発生しつる量であれば良い。Therefore, in the present invention, chromium carbide on the surface of stainless steel alloy powder is reduced by sintering in a reduced pressure atmosphere, and at the same time, chromium vapor is supplied during sintering to prevent evaporation of chromium from the surface. Deposit chromium on the surface. The degree of vacuum required for the reduction of chromium carbides is 2×
The pressure is 10'' torr or less, and the amount of chromium source is sufficient to generate chromium vapor during sintering.
尚、クロム炭化物の還元のためには、水素又はアンモニ
ア分解ガス等の還元性雰囲気の使用を考えられるが、水
素の使用はコストが高く、アンモニア分解ガスの場合に
は露点を低く保つことが必要で、量産工程においてはこ
のフントロールが困難である欠点がある。Note that in order to reduce chromium carbides, it is possible to use a reducing atmosphere such as hydrogen or ammonia decomposition gas, but the use of hydrogen is expensive, and in the case of ammonia decomposition gas, it is necessary to keep the dew point low. However, there is a drawback that this control is difficult in a mass production process.
実施例１
噴霧法で製造したＳＵＳ ３０４ Ｌ （Ｆｅ−１９ｗ
ｔ％Ｃｒ−１０ｗｔ％Ｎｉ）合金粉と、ＳＵＳ ４４０
Ｌ （Ｆｅ−１２，５ｗｔ％Ｏｒ）合金粉とを用いて
、夫々外径４０鴎、内径２７闘及び厚さ５闘のリングを
圧カフ ｔｏｎ７２ｍで成形した。各成形体を、アルミ
ナボートに充填したＦｅ −６０ｗｔ％Ｃｒ合金粉末（
−１００ｍｅｓｈ）とアルミナ粉末の体積比１：１での
混合粉末３．０に９中に埋め、半密閉状態となるようア
ルミナボートに蓋をして、真空度１Ｏ−３ｔｏｒｒで１
２５０ Ｃにて６０分間焼結し、本発明の焼結ステンレ
ス鋼材を製造した。Example 1 SUS 304 L (Fe-19w) manufactured by spraying method
t%Cr-10wt%Ni) alloy powder and SUS 440
Rings with an outer diameter of 40 mm, an inner diameter of 27 mm, and a thickness of 5 mm were molded using a pressure cuff of 72 m using L (Fe-12,5 wt% Or) alloy powder. Fe-60wt%Cr alloy powder (
-100mesh) and alumina powder at a volume ratio of 1:1, and the alumina boat was covered with a lid to create a semi-sealed state.
Sintering was performed at 250 C for 60 minutes to produce the sintered stainless steel material of the present invention.
比較のために、ＳＵＳ ３０４ ＬとＳＵＳ ４１０
Ｌの同一形状の溶製鋼材、並びにＳＵＳ ３０４ Ｌと
ＳＵｓ ４１０Ｌの各合金粉から従来の焼結法により製
造した従来の焼結ステンレス鋼材を夫々準備した。For comparison, SUS 304 L and SUS 410
A conventional sintered stainless steel material manufactured by a conventional sintering method from each alloy powder of SUS 304 L and SUs 410L was prepared.
これらの各鋼材を塩水噴霧試験に供し、酸化増量と塩水
の噴霧時間との関係を調べ、その結果を第１図（ＳＵＳ
３０４ Ｌ）及び第２図（ＳＵＳ ４１０ Ｌ）に示
した。第１図及び第２図から解るように、ＳＵＳ ４１
０ Ｌの方がＳＵＳ ３０４ Ｌよりも腐食量が大さい
が、いずれも従来の焼結ステンレス鋼材（ｂ）は腐食の
進行が急激であるのに対して、本発明の焼結ステンレス
鋼材（ａ）は腐食の進行が著しく遅く、溶製鋼材（ｃ）
に近い耐食性を示す。Each of these steel materials was subjected to a salt water spray test to investigate the relationship between oxidation weight gain and salt water spray time, and the results are shown in Figure 1 (SUS
304 L) and Fig. 2 (SUS 410 L). As can be seen from Figures 1 and 2, SUS 41
0 L has a larger amount of corrosion than SUS 304 L, but in both cases, the corrosion progresses rapidly in the conventional sintered stainless steel material (b), while the sintered stainless steel material of the present invention (a) ), the progress of corrosion is extremely slow, and molten steel (c)
It shows corrosion resistance close to that of
実施例２
実施例１と同様の２種類のステンレス鋼合金粉の成形体
を、両面に厚さ５０μｍのクロムメッキを施したステン
レス板のアルミナ粉末を塗布した上ニ載せ、これを半密
閉状態に蓋をしたアルミナボート内に入れて実施例１と
同様に真空度１０−３ｔｏｒｒで１２５０ Ｃにて６０
分間焼結した。Example 2 A molded body of the same two types of stainless steel alloy powder as in Example 1 was placed on a stainless steel plate coated with alumina powder, which was chromium plated on both sides with a thickness of 50 μm, and this was placed in a semi-sealed state. It was placed in a covered alumina boat and heated to 60°C at a vacuum level of 10-3 torr and 1250 C as in Example 1.
Sintered for minutes.
得られた焼結ステンレス鋼を、実施例１と同様に、溶製
鋼材及び従来の焼結ステンレス鋼材と共に塩水噴霧試験
に供し、酸化増量と塩水の噴霧時間との関係を調べた結
果を第３図（ｓｕｓ ３０４ Ｌ）及び第４図（ＳＵ、
Ｓ ４１０ Ｌ）に示した。第３図及び第４図から、従
来の焼結ステンレス鋼材（ｂ）は腐食の進行が急激であ
るのに対して、本発明の焼結ステンレス鋼材（ａ）は腐
食の進行が著しく遅く、溶製鋼材（Ｃ）に近い耐食性を
示すことが解る。As in Example 1, the obtained sintered stainless steel was subjected to a salt water spray test together with a melted steel material and a conventional sintered stainless steel material, and the results of investigating the relationship between oxidation weight gain and salt water spray time were reported in the third example. Figure (sus 304 L) and Figure 4 (SU,
S 410 L). From FIGS. 3 and 4, it can be seen that the conventional sintered stainless steel material (b) progresses rapidly in corrosion, while the sintered stainless steel material (a) of the present invention shows extremely slow corrosion progress, and It can be seen that it exhibits corrosion resistance close to that of steel material (C).
本発明によれば、同一組成の溶製鋼材とほぼ等シイ優し
た耐食性を有する焼結ステンレス鋼を提供することがで
きる。According to the present invention, it is possible to provide a sintered stainless steel having corrosion resistance that is almost equal to and superior to that of molten steel having the same composition.
この耐食性の優れた焼結ステンレス鋼は各種流体処理用
のフィルター、自動車用アンチロックシステムの速度セ
ンサ一部品等に有用である。This sintered stainless steel with excellent corrosion resistance is useful for various fluid treatment filters, speed sensor parts for automobile anti-lock systems, etc.
第１図、第２図、第３図及び第４図は、組成及び製法を
変えた本発明の焼結ステンレス鋼材と他（７５穐
の鋼材との塩水噴霧試験における酸化増量と塩水の噴霧
時間との関係を示すグラフであり、各図中のａは本発明
の焼結ステンレス鋼材を、ｂは従来の焼結ステンレス鋼
材を、及びＣは溶製鋼材を夫夫表わしている。
第１図
時間（ｈｒ）
第３図
時間（ｈｒ）Figures 1, 2, 3, and 4 show the oxidation weight gain and salt water spray time in salt water spray tests of the sintered stainless steel materials of the present invention with different compositions and manufacturing methods and other steel materials (75 mm). In each figure, a represents the sintered stainless steel material of the present invention, b represents the conventional sintered stainless steel material, and C represents the molten steel material. Time (hr) Figure 3 Time (hr)
Claims (1)
雰囲気中においてクロム蒸気の存在下で焼結することを
特徴とする焼結ステンレス鋼の製造方法。(1) A method for producing sintered stainless steel, which comprises molding stainless steel alloy powder and sintering the molded body in the presence of chromium vapor in a reduced pressure atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27920686A JPS63130744A (en) | 1986-11-21 | 1986-11-21 | Manufacture of sintered stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27920686A JPS63130744A (en) | 1986-11-21 | 1986-11-21 | Manufacture of sintered stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63130744A true JPS63130744A (en) | 1988-06-02 |
Family
ID=17607912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27920686A Pending JPS63130744A (en) | 1986-11-21 | 1986-11-21 | Manufacture of sintered stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63130744A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006227327A (en) * | 2005-02-18 | 2006-08-31 | Fuji Photo Film Co Ltd | Photographing apparatus |
-
1986
- 1986-11-21 JP JP27920686A patent/JPS63130744A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006227327A (en) * | 2005-02-18 | 2006-08-31 | Fuji Photo Film Co Ltd | Photographing apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69511537D1 (en) | METHOD FOR PRODUCING METAL COMPOSITE POWDER | |
| CN108546889B (en) | Stainless steel material and preparation method thereof | |
| US4996022A (en) | Process for producing a sintered body | |
| GB2092619A (en) | Porous sintered body and procedure for producing porous sintered bodies | |
| ATE212073T1 (en) | METHOD FOR PRODUCING HIGH DENSITY SINTERED WORKPIECES WITH HIGH CARBON CONTENT | |
| JPS63130744A (en) | Manufacture of sintered stainless steel | |
| JPS5852406A (en) | Hot hydrostatic pressing method | |
| JP2922248B2 (en) | Manufacturing method of sintered alloy with excellent corrosion resistance | |
| JPS61223106A (en) | Production of high alloy clad product | |
| JPH07100629A (en) | Production of high-density material | |
| JPS59205404A (en) | Powder solidifying method | |
| JPH07173506A (en) | Method for densifying and sintering 10wt.%-cr ferritic steel green compact | |
| Shibata | Catalyst Carriers and a Method for Producing the Same | |
| JP3135555B2 (en) | High speed tool steel sintered body | |
| JPH02170902A (en) | Manufacture of corrosion-resistant sintered stainless steel | |
| JPS6021221B2 (en) | Titanium surface hardening method | |
| JPS6151001B2 (en) | ||
| JPH09202950A (en) | Austenitic stainless steel sintered compact and its production | |
| JPS6311634A (en) | Sliding material | |
| JPS63162849A (en) | Method for coating surface of steel material | |
| JPS6056763B2 (en) | Corrosion-resistant sintered parts and their manufacturing method | |
| JPS5698403A (en) | Sintering method of blank material for permanent magnet | |
| JPH05214497A (en) | High performance low carbon ferrous sintered material and its manufacture | |
| JPH07179960A (en) | Production of titanium or titanium alloy sintered compact | |
| JPH02203081A (en) | Two-layer sintered seal ring and manufacture thereof |