JPH0353001A - Manufacture of sintered alloy having corrosion resistant film - Google Patents
Manufacture of sintered alloy having corrosion resistant filmInfo
- Publication number
- JPH0353001A JPH0353001A JP18807189A JP18807189A JPH0353001A JP H0353001 A JPH0353001 A JP H0353001A JP 18807189 A JP18807189 A JP 18807189A JP 18807189 A JP18807189 A JP 18807189A JP H0353001 A JPH0353001 A JP H0353001A
- Authority
- JP
- Japan
- Prior art keywords
- green compact
- sintered
- alloy
- powder
- corrosion resistance
- 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
- 230000007797 corrosion Effects 0.000 title claims abstract description 27
- 238000005260 corrosion Methods 0.000 title claims abstract description 27
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 25
- 239000000956 alloy Substances 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 11
- 238000005056 compaction Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 abstract description 7
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 229910052719 titanium Inorganic materials 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910052737 gold Inorganic materials 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 229910052763 palladium Inorganic materials 0.000 abstract 1
- 229910052697 platinum Inorganic materials 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 229910052718 tin Inorganic materials 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000007747 plating Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 235000012046 side dish Nutrition 0.000 description 1
- 239000004575 stone 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１
本発明は、超硬合金、磁性合金、その他粉末冶金法によ
る合金の製造方法に関する．
〔従来の技術］
従来、填結合金表面に耐食性被膜を生成する方法として
、焼結後に，湿式メッキ，乾式メッキ、または、塗装を
付加する工程がとられていた。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for producing cemented carbide, magnetic alloy, and other alloys by powder metallurgy. [Prior Art] Conventionally, as a method for forming a corrosion-resistant film on the surface of a filler metal, a process of adding wet plating, dry plating, or painting after sintering has been used.
［発明が解決しようとする課題１
ところが、これら方法は、湿式メッキにおいては，前洗
浄で錆易いこと、乾式メッキにおいては蒸着ムラやビン
ホールが出易いこと、塗装においては、剥離強度が弱い
こと等の問題があり、完全な耐食性改善になっていない
．
［課題を解決するための手段］
上記課題を解決するために本発明では、合金組成粉末の
粉末成形時に、耐食性を有する材料を表面に被覆した合
金組或粉末の圧粉体を成形し、ちしくは、合金組成粉末
の粉末成形上がりの圧粉体の表面に耐食性を有する材料
を被覆し、その後、焼結することにより，焼結合金に耐
食性を付与するものである．
［作用１
本発明によれば、焼結前に耐食性を有する材料を圧粉体
表面に被覆しており、墳結処理によって該ｉｉ１食性を
有する材料は、拡散処理され、全く欠陥の無い、且つ，
極めて剥離強度の高い耐食性被膜が得られるものである
．
耐食性を有する材料としては、ＡＩ２、Ｔｉ、Ｃｒ．Ｎ
ｉ．Ｃｕ．Ｚｎ．Ｐｄ．Ａｇ．Ｓｎ．Ｐｔ．Ａｕ等、又
は、それらを含む化合物が有効である．
更に、粉末成形→予備焼結一填結の様な焼結合金の製造
方法においては、予備填結した圧粉体の表面に耐食性を
有する材料を被覆した後、本墳結を実施することも、本
発明の焼結合金の製造方法の一例であることは、云うま
でもないことである．
［実施例１
以下，本発明の実施例について説明する．（第一実施例
］
第一は，本発明の焼結合金の製造方法の一実施例を示す
工程図である．
まづ，市販の粒径０．５ミクロンのＷＣ扮末と粒径ｌミ
クロンのＣＯ粉末を重量比９：１の割合でボールミルに
て７２時間混合粉砕し、混合粉砕された粉末を乾燥２の
工程で乾燥し、乾燥した原料粉末を内径２０ｍｍのゴム
型に詰め、４ｔｏｎ／ ｃ ｍ ”の圧力で液圧成形し
、外径１ ３ｍｍで高さ７ｍｍの成形体を得た．
次に、成形体を機械加工で形状を整え、スパッタ装置に
おいてＮｉとＷＣとを交互に３：７の膜厚比で、３Ｎづ
つ計１０ミクロンの膜厚でコーティングを施して、形状
を整えた成形体表面に耐食性材料を被覆した後．１６５
０℃で真空填結を行ない、１ ６２０℃ｌ００気圧のＡ
ｒガス中で加圧焼結し、その後、ポリッシングで光沢処
理をほどこした．
こうして出来たサンプルｌＯコについて、填結〜研削加
工後に８０Ｗｔ％ＷＣ−２０Ｗｔ％Ｎｉ合金の１０ミク
ロンパックを行なったものｌＯコと耐食性について比較
した結果，第一表に示す通り，サビ発生までの平均日数
が、本発明品は４６倍とすぐれた副食性を示した．
尚、硬度は同等で、衝撃による剥離強度も約３倍の高特
性が得られた．
第 ｌ
表
（第２実施例）
第２図は、本発明の焼結合金の製造方法の他の実施例を
示す工程図である．
ダイ内径３ｍｍでクリアランス片側３０ミクロンの非磁
性超硬金型をＮｕ場プレス装置内に、パンチがＴ度ダイ
の中心になるように慎重にセットし，グイ内面と上下パ
ンチ表面に粘度１ ００００センチボアズのシリコンオ
イルをナイロンのはけを用いて均一に且つ薄く塗った。[Problem to be Solved by the Invention 1] However, with these methods, wet plating is prone to rust due to pre-cleaning, dry plating is prone to uneven deposition and bottle holes, and painting is weak in peel strength, etc. Due to this problem, corrosion resistance has not been completely improved. [Means for Solving the Problems] In order to solve the above problems, in the present invention, a green compact of alloy composition or powder whose surface is coated with a material having corrosion resistance is formed during powder compaction of alloy composition powder, and More specifically, the surface of the green compact after compacting the alloy composition powder is coated with a material having corrosion resistance, and then sintered to impart corrosion resistance to the sintered alloy. [Effect 1] According to the present invention, the surface of the green compact is coated with a material having corrosion resistance before sintering, and the material having corrosion resistance is diffused by the embedding process, and has no defects at all. ，
A corrosion-resistant coating with extremely high peel strength can be obtained. Materials with corrosion resistance include AI2, Ti, Cr. N
i. Cu. Zn. Pd. Ag. Sn. Pt. Au, etc., or compounds containing them are effective. Furthermore, in the manufacturing method of sintered alloys such as powder compaction → pre-sintering and filling, the main sintering may be carried out after coating the surface of the pre-filled green compact with a corrosion-resistant material. It goes without saying that this is an example of the method for manufacturing the sintered alloy of the present invention. [Example 1 An example of the present invention will be described below. (First Example) The first is a process diagram showing an example of the method for producing a sintered alloy of the present invention. First, commercially available WC powder with a particle size of 0.5 microns and a particle size of 1 micron. CO powder was mixed and pulverized in a ball mill for 72 hours at a weight ratio of 9:1, the mixed and pulverized powder was dried in the drying step 2, the dried raw material powder was packed into a rubber mold with an inner diameter of 20 mm, and 4 tons/ Hydroforming was carried out at a pressure of 1.5 cm to obtain a molded body with an outer diameter of 13 mm and a height of 7 mm. Next, the molded body was shaped by machining, and Ni and WC were alternately applied to : After applying a coating with a total thickness of 10 microns in 3N increments at a film thickness ratio of 7:165.
Vacuum sealing was carried out at 0°C, and A of 1,620°C and 100 atm.
It was sintered under pressure in R gas, and then polished to give it a glossy finish. As a result of comparing the corrosion resistance of the sample 1O produced in this way with that of the sample 1O which was packed with 10 micron pack of 80Wt%WC-20Wt%Ni alloy after filling and grinding, as shown in Table 1, it was found that The average number of days was 46 times longer for the product of the present invention, showing superior applicability as a side dish. In addition, the hardness was the same, and the peel strength due to impact was about three times higher. Table 1 (Second Example) FIG. 2 is a process diagram showing another example of the method for producing a sintered alloy of the present invention. Carefully set a non-magnetic carbide mold with a die inner diameter of 3 mm and a clearance of 30 microns on one side in a Nu field press machine so that the punch is in the center of the T-degree die. A thin layer of silicone oil was applied evenly and thinly using a nylon brush.
次に、粘度１００センチポアズのシリコンオイル２０Ｗ
ｔ％添加して充分に練っておいたＮｉ超微粉末をダイ内
面と上下パンチに２０ミクロン〜３０ミクロンの厚みで
出来るだけ均一に塗布し、成形型内面に耐食性材料を被
覆した．
その後、ａｔ％でＮｄｌ７％、Ｂ６，５％、残りＦｅの
組成から成り、不活性ガス中で溶解１０〜粗粉砕１１〜
微粉砕ｌ２の工程を経て製造された３．０ミクロン粒径
の合金微粉末０．１グラムを耐食性材料を被覆したダイ
内に充填し，１５００００ｅの平行磁界中で２．５ｔｏ
ｎ／ｃｍ”の圧力を付加し磁場成形し、外径３．１ｍｍ
で高さ２．５ｍｍの、表面にＮｉが被覆された成形体を
得た．
そして，その成形体を３００℃、６００℃で２段の真空
脱ガス後、１ ０００℃真空．１０５０℃Ａｒ １ ０
０気圧で填結し、その後Ａｒを３気圧まで下げ、１００
０℃〜６００℃の間で徐冷時効後急冷し，外径２．７ｍ
ｍ．高さ２．２ｍｍのＮｄＦｅＢ焼結ｍ石を得た．
こうして出来たサンプル２０コについて、焼結時効後に
無電界Ｎｉメッキ４ミクロンを行なったもの２０コと、
耐食性について比較した結果、第２表に示す通り、サビ
発生までの平均時間が、本発明品は３倍から１３倍とす
ぐれた耐食性を示した．
尚，Ｍ１気特性は同等であった．
第 ２ 表
［発明の効果］
以上、本発明は，Ｍａ結合金に対して、高温での微粉末
の拡散収縮作用で耐食性を持った材料の被覆を行なう為
，欠陥が殆どなく、且つ、剥離に強く，極めて高い信頼
性を持った耐食性被膜を生成する効果を持つ．Next, use 20W silicone oil with a viscosity of 100 centipoise.
Ultrafine Ni powder, which had been sufficiently kneaded with t% addition, was applied as uniformly as possible to the inner surface of the die and the upper and lower punches to a thickness of 20 to 30 microns, and the inner surface of the mold was coated with a corrosion-resistant material. After that, the composition was composed of 7% Ndl, 6.5% B, and the rest Fe in at%, and it was dissolved in an inert gas from 10 to coarsely pulverized to 11 to
0.1 g of alloy fine powder with a particle size of 3.0 microns manufactured through the process of pulverization 12 was filled into a die coated with a corrosion-resistant material, and 2.5 to
Formed in a magnetic field by applying a pressure of "n/cm" to an outer diameter of 3.1 mm.
A molded body having a height of 2.5 mm and whose surface was coated with Ni was obtained. The molded body was degassed under vacuum at 300°C and 600°C in two stages, and then heated at 1000°C under vacuum. 1050℃Ar 10
Filling was carried out at 0 atm, then the Ar was lowered to 3 atm, and 100
After slowly cooling and aging between 0℃ and 600℃, the outer diameter is 2.7m.
m. A NdFeB sintered stone with a height of 2.2 mm was obtained. Of the 20 samples thus made, 20 were subjected to electroless Ni plating of 4 microns after sintering and aging.
As a result of comparing the corrosion resistance, as shown in Table 2, the products of the present invention exhibited excellent corrosion resistance, with the average time until rusting occurring 3 to 13 times. Furthermore, the M1 characteristics were the same. Table 2 [Effects of the Invention] As described above, the present invention coats the Ma alloy with a corrosion-resistant material through the diffusion and shrinkage action of fine powder at high temperatures. It has the effect of producing a corrosion-resistant coating that is resistant to corrosion and has extremely high reliability.
第１図は、本発明の填結合金の製造方法の一実施例を示
す工程図、第２図は，本発明の焼結合金の製造方法の他
の実施例を示す工程図である．５・・・耐食性材料被覆
９・・・成形型内面への耐食性材料の被覆以
上FIG. 1 is a process diagram showing one embodiment of the method for producing a filler metal according to the present invention, and FIG. 2 is a process diagram showing another embodiment of the method for producing a sintered alloy according to the present invention. 5... Corrosion resistant material coating 9... Corrosion resistant material coating or more on the inner surface of the mold
Claims (2)
造方法において、粉末成形工程により、合金組成の圧粉
体を成形するとともに、該圧粉体の表面に耐食性を有す
る材料を被覆することを特徴とする焼結合金の製造方法
。(1) In a method for manufacturing an alloy in which alloy composition powder is powder compacted and then sintered, a powder compact of the alloy composition is formed in a powder compacting step, and the surface of the compact is coated with a material having corrosion resistance. A method for producing a sintered alloy, characterized by:
造方法において、粉末成形により合金組成粉末の圧粉体
を成形した後、該圧粉体の表面に、耐食性を有する材料
を被膜することを特徴とする焼結合金の製造方法。(2) In the method for producing an alloy in which alloy composition powder is powder-molded and then sintered, after a green compact of alloy composition powder is formed by powder compaction, the surface of the green compact is coated with a material having corrosion resistance. A method for producing a sintered alloy, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18807189A JPH0353001A (en) | 1989-07-20 | 1989-07-20 | Manufacture of sintered alloy having corrosion resistant film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18807189A JPH0353001A (en) | 1989-07-20 | 1989-07-20 | Manufacture of sintered alloy having corrosion resistant film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0353001A true JPH0353001A (en) | 1991-03-07 |
Family
ID=16217200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18807189A Pending JPH0353001A (en) | 1989-07-20 | 1989-07-20 | Manufacture of sintered alloy having corrosion resistant film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0353001A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016152778A1 (en) * | 2015-03-20 | 2016-09-29 | 日立化成株式会社 | Method for forming molded article by press molding |
-
1989
- 1989-07-20 JP JP18807189A patent/JPH0353001A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016152778A1 (en) * | 2015-03-20 | 2016-09-29 | 日立化成株式会社 | Method for forming molded article by press molding |
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