JPS6314062B2 - - Google Patents
Info
- Publication number
- JPS6314062B2 JPS6314062B2 JP54117285A JP11728579A JPS6314062B2 JP S6314062 B2 JPS6314062 B2 JP S6314062B2 JP 54117285 A JP54117285 A JP 54117285A JP 11728579 A JP11728579 A JP 11728579A JP S6314062 B2 JPS6314062 B2 JP S6314062B2
- Authority
- JP
- Japan
- Prior art keywords
- spraying
- powder
- plasma
- present
- thermal
- 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
- 239000000843 powder Substances 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims 1
- 238000007750 plasma spraying Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000007751 thermal spraying Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Description
本発明はプラズマ溶射の溶着法に関するもので
ある。
従来、Ni−WC系溶射皮膜は高負荷かつ耐摩耗
性の要求される部分に用いられ第１図の顕微鏡写
真に示すようにNi合金にて皮膜の靭性および素
地との結合力を強化し、その中に皿をふせた形状
で分散しているWCにて硬度（耐摩耗性）をもた
せている。リング状材ａへのプラズマ溶射を第２
図に示す。第２図中ｂはガン、ｃはパウダ供給
部、ｄはN2＋H2ガス供給部、ｅは冷却水供給
部、ｆは冷却水出口部であり、ｅ，ｆ，にはDC
ケーブルが通つている。このプラズマ溶射の一般
的な溶射件は
ガス：N2＋H2
（N2：34／min、H2：７／min）
電流：500A
電圧：80V
ガン距離：150mm
パウダ送給速度：2.0gr／sec
である。
また、Ni−WC系溶射パウダの成分は次表のよ
うになる。
The present invention relates to a plasma spray welding method. Conventionally, Ni-WC thermal sprayed coatings have been used in parts that require high load and wear resistance. Hardness (wear resistance) is given by WC dispersed in the shape of a covered plate. Second plasma spraying on ring-shaped material a
As shown in the figure. In Figure 2, b is the gun, c is the powder supply section, d is the N 2 + H 2 gas supply section, e is the cooling water supply section, f is the cooling water outlet, and e and f are the DC
The cable is running. The general conditions for plasma spraying are: Gas: N 2 + H 2
(N 2 : 34/min, H 2 : 7/min) Current: 500A Voltage: 80V Gun distance: 150mm Powder feeding speed: 2.0gr/sec. The ingredients of Ni-WC thermal spray powder are shown in the table below.
【表】
しかし、この溶射パラメータにおいては、パウ
ダが高価であるのに溶着効率（使用したパウダ重
量と溶着した重量の比）が悪い。
すなわち、第３図に示すように外径φ100mm、
幅10mmのリング状材ａに溶着した場合29.6％、第
４図に示すように無限板状a′に溶射した場合39.0
％である。
この溶着効率を向上させるにはガン距離GDを
近づければよく第５図に示す効果があるが半面第
６図に示す写真図のように空孔ｇが増大するため
皮膜間の結合力が低下し（第５図中●印）皮膜が
はがれやすくなるため下記のように耐摩耗性が低
下してしまう。
摩耗減量
ガン距離 gr／1000H
75mm 1.54
150mm 0.84
本発明は上記の事情に鑑みなされたものであつ
て、その目的とするところは、溶射パラメータの
変更に伴う溶射皮膜欠陥の発生が防止でき、しか
も、ガン距離（溶射距離）を小さくして溶着効率
の向上を図ることができるプラズマ溶射の溶着法
を提供することにある。
以下、本発明を説明する。本発明方法はワーク
１の溶射される表面２に溶射方向の横方向からエ
アジエツト３を当てるようにすることであり、エ
アジエツト３の角度は溶射方向に対して45〜80度
が好適である。
第９図にガン７からの溶射中のプラズマジエツ
トを示す。プラズマジエツト４の中央部（高温高
速部）５の外周約100mmの範囲には未溶融の微細
パウダ流６が存在し、このパウダを第１０図に示
すように皮膜内に巻込むため第６図の写真図のよ
うな皮膜となる。
ただし、ガン距離150mmとなる微細パウダは拡
散し付着しない。
なお第１０図においてワーク１のＡ部分は溶射
前に未溶融パウダが付着し、Ｂ部分は溶射部分で
あり、Ｃ部分は溶射後に未溶融パウダが付着する
部分である。矢印はワーク１の回転方向を示す。
本発明方法の場合、エアジエツト３により未溶
融微細パウダを吹きとばし、このパウダの皮膜へ
の巻込みをなくすことであり、その結果、第１１
図の写真図のように第６図の写真図に比べて皮膜
は均一であり単独の空孔がわずかに見える程度で
ある。
また、ガン距離を近づけたにもかかわらずその
皮膜組織は第１図の写真図の皮膜組織と同一であ
る。なお、この時のエア圧力は0.7Kg／cm2以上で
速度は10ｍ／sec以上である。
また、本発明方法による溶着法における溶着効
率は第５図○印で示すものとなる。
本発明は以上詳述したように、溶射点近傍にエ
アジエツトを当ててエアジエツトにより溶射ジエ
ツトの外周部の未溶融微細パウダを吹きとばすよ
うにしたことを特徴とするプラズマ溶射の溶着法
である。
したがつて、溶射パラメータの変更に伴う溶射
皮膜欠陥の発生が防止でき、しかも、ガン距離
（溶射距離）を小さくして溶着効率を向上させる
ことができる。[Table] However, with these thermal spraying parameters, the welding efficiency (ratio of the weight of the powder used to the weight of the welded product) is poor even though the powder is expensive. In other words, as shown in Figure 3, the outer diameter is φ100mm,
29.6% when welded to a ring-shaped material a with a width of 10 mm, and 39.0% when sprayed to an infinite plate-shaped material a' as shown in Figure 4.
%. In order to improve this welding efficiency, the gun distance GD can be brought closer, producing the effect shown in Figure 5, but on the other hand, as shown in the photograph in Figure 6, the bonding strength between the films decreases due to the increase in pores (g). However, as the film peels off easily (marked with ● in Figure 5), the wear resistance decreases as shown below. Wear loss Gun distance gr/1000H 75mm 1.54 150mm 0.84 The present invention was made in view of the above circumstances, and its purpose is to prevent the occurrence of thermal spray coating defects due to changes in thermal spray parameters, and to It is an object of the present invention to provide a welding method using plasma spraying that can improve welding efficiency by reducing the gun distance (spraying distance). The present invention will be explained below. The method of the present invention is to apply an air jet 3 to the surface 2 of the workpiece 1 to be thermally sprayed from a direction transverse to the thermal spraying direction, and the angle of the air jet 3 is preferably 45 to 80 degrees with respect to the thermal spraying direction. FIG. 9 shows the plasma jet from gun 7 during thermal spraying. There is an unmelted fine powder flow 6 in a range of about 100 mm around the outer circumference of the central part (high-temperature and high-speed part) 5 of the plasma jet 4, and as shown in FIG. A film will form as shown in the photo in the figure. However, fine powder at a gun distance of 150 mm will spread and not adhere. In FIG. 10, portion A of the workpiece 1 has unmelted powder attached to it before thermal spraying, portion B is the sprayed portion, and portion C is the portion to which unmelted powder adheres after thermal spraying. The arrow indicates the direction of rotation of the workpiece 1. In the case of the method of the present invention, the unmelted fine powder is blown away by the air jet 3 to prevent the powder from being entangled in the film.
As shown in the photograph in the figure, compared to the photograph in FIG. 6, the film is more uniform and individual pores are slightly visible. Furthermore, even though the gun distance was shortened, the film structure was the same as that shown in the photograph of FIG. Note that the air pressure at this time is 0.7 Kg/cm 2 or more, and the speed is 10 m/sec or more. Further, the welding efficiency in the welding method according to the present invention is as shown by the circle in FIG. As described in detail above, the present invention is a plasma spray welding method characterized in that an air jet is applied near the spraying point and the unmelted fine powder on the outer periphery of the spray jet is blown away by the air jet. Therefore, it is possible to prevent thermal spray coating defects from occurring due to changes in thermal spray parameters, and to improve welding efficiency by reducing the gun distance (spraying distance).
第１図は溶射皮膜断面の顕微鏡写真図、第２図
はプラズマ溶射装置の説明図、第３図はリング状
材へのプラズマ溶射の説明図、第４図は平板状材
へのプラズマ溶射の説明図、第５図は溶着効率と
強度の説明図、第６図はガン距離64mmの場合の溶
射皮膜断面の顕微鏡写真図、第７図は本発明方法
を説明するためのプラズマ溶射の側面図、第８図
は同平面図、第９図はプラズマジエツトの説明
図、第１０図は未溶融微細パウダの巻込み状態の
説明図、第１１図は本発明方法により形成された
溶射皮膜断面の顕微鏡写真図である。
Figure 1 is a microscopic photograph of a cross section of a thermally sprayed coating, Figure 2 is an explanatory diagram of a plasma spraying device, Figure 3 is an explanatory diagram of plasma spraying on a ring-shaped material, and Figure 4 is an illustration of plasma spraying on a flat material. Explanatory diagram, Figure 5 is an explanatory diagram of welding efficiency and strength, Figure 6 is a microscopic photograph of a cross section of the sprayed coating when the gun distance is 64 mm, and Figure 7 is a side view of plasma spraying to explain the method of the present invention. , FIG. 8 is a plan view of the same, FIG. 9 is an explanatory diagram of the plasma jet, FIG. 10 is an explanatory diagram of the entrained state of unmelted fine powder, and FIG. 11 is a cross section of the thermal spray coating formed by the method of the present invention. FIG.
Claims (1)
ツトにより溶射ジエツトの外周部の未溶融微細パ
ウダを吹きとばすようにしたことを特徴とするプ
ラズマ溶射の溶着法。1. A plasma spray welding method characterized by applying an air jet near the spraying point and blowing away unmelted fine powder on the outer periphery of the spraying jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11728579A JPS5644070A (en) | 1979-09-14 | 1979-09-14 | Melt-sticking of plasma spray coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11728579A JPS5644070A (en) | 1979-09-14 | 1979-09-14 | Melt-sticking of plasma spray coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5644070A JPS5644070A (en) | 1981-04-23 |
| JPS6314062B2 true JPS6314062B2 (en) | 1988-03-29 |
Family
ID=14707953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11728579A Granted JPS5644070A (en) | 1979-09-14 | 1979-09-14 | Melt-sticking of plasma spray coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5644070A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0497153U (en) * | 1991-01-21 | 1992-08-21 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4289926B2 (en) | 2003-05-26 | 2009-07-01 | 株式会社小松製作所 | Sliding material, sliding member, sliding component, and apparatus to which the sliding material is applied |
| JP4734045B2 (en) * | 2005-05-18 | 2011-07-27 | 株式会社共和 | 庇 |
| JP5593610B2 (en) * | 2008-12-26 | 2014-09-24 | マツダ株式会社 | Method for producing film forming member |
-
1979
- 1979-09-14 JP JP11728579A patent/JPS5644070A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0497153U (en) * | 1991-01-21 | 1992-08-21 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5644070A (en) | 1981-04-23 |
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