JPH06322553A - Formation of reinforcing layer on base material - Google Patents
Formation of reinforcing layer on base materialInfo
- Publication number
- JPH06322553A JPH06322553A JP11060793A JP11060793A JPH06322553A JP H06322553 A JPH06322553 A JP H06322553A JP 11060793 A JP11060793 A JP 11060793A JP 11060793 A JP11060793 A JP 11060793A JP H06322553 A JPH06322553 A JP H06322553A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- layer
- brazing material
- reinforcing layer
- thermal spray
- 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
Landscapes
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は母材の強化層形成方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a reinforcing layer of a base material.
【０００２】[0002]
【従来の技術】一般に、石炭の竪ミル分級器の羽根車な
どのボイラ用部品、エンジン部品等の母材の表面に、超
硬合金の溶射（プラズマ溶射、ガス溶射等）を行って、
耐摩耗性、耐熱性及び耐蝕性の優れた溶射皮膜を形成
し、母材の表面を補強することがすでに研究乃至実施さ
れている。2. Description of the Related Art Generally, the surface of a base material such as a boiler part such as an impeller of a vertical mill classifier for coal and a base material such as an engine part is sprayed with a cemented carbide (plasma spraying, gas spraying, etc.),
It has already been studied or carried out to form a sprayed coating having excellent wear resistance, heat resistance and corrosion resistance to reinforce the surface of the base material.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上述の溶射
皮膜は、耐摩耗性、耐熱性及び耐蝕性に優れているが、
プラズマ溶射、ガス溶射等の溶射により形成する場合、
図２に示すように溶射皮膜２には割れ５や気孔４がかな
らず存在するため、耐摩耗性等が劣ると共に、耐高温酸
化特性も悪くなる。The above-mentioned thermal spray coating has excellent wear resistance, heat resistance and corrosion resistance.
When forming by thermal spraying such as plasma spraying, gas spraying,
As shown in FIG. 2, since the sprayed coating 2 always has cracks 5 and pores 4, wear resistance and the like are deteriorated, and high temperature oxidation resistance is also deteriorated.
【０００４】そこで、本発明は、このような事情を考慮
してなされたものであり、その目的は、耐摩耗性等に優
れた特性を示す強化層を形成することができる母材の強
化層形成方法を提供することにある。Therefore, the present invention has been made in view of such circumstances, and an object thereof is to form a reinforcing layer of a base material capable of forming a reinforcing layer exhibiting excellent characteristics such as abrasion resistance. It is to provide a forming method.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するために、母材の表面に強化層を形成するに際し
て、上記母材の表面に、超硬合金の溶射皮膜を形成し、
この溶射皮膜上にろう材を塗布した後、これを不活性ガ
ス雰囲気で加熱して、ろう材を溶浸させると共に拡散さ
せるものである。In order to achieve the above-mentioned object, the present invention forms a sprayed coating of cemented carbide on the surface of the base material when forming a reinforcing layer on the surface of the base material,
After applying a brazing material on the sprayed coating, the brazing material is heated in an inert gas atmosphere to infiltrate and diffuse the brazing material.
【０００６】[0006]
【作用】母材の表面に溶射皮膜を形成すると共にこの上
にろう材を塗布し、これを不活性ガス雰囲気で加熱し
て、ろう材を溶浸させると共に拡散させることで、ろう
材が溶融して溶射皮膜の割れや気孔に浸透し皮膜の欠陥
（割れや気孔）がなくなるので、溶射皮膜の耐摩耗性、
耐蝕性等の特性が向上する。また、加熱により母材と溶
射皮膜の界面に拡散層が生じて、母材と溶射皮膜の付着
形態が金属的結合になるので、界面強度が向上する。従
って、耐摩耗性等に優れた特性を示すと共に剥離しにく
い強化層を形成することが可能となる。[Function] A brazing material is melted by forming a thermal spray coating on the surface of the base material, applying a brazing material on this, heating this in an inert gas atmosphere, and infiltrating and diffusing the brazing material. As it penetrates into the cracks and pores of the thermal spray coating and eliminates coating defects (cracks and pores), the wear resistance of the thermal spray coating,
Properties such as corrosion resistance are improved. Further, since a diffusion layer is generated at the interface between the base material and the thermal spray coating due to heating, and the form of adhesion between the base material and the thermal spray coating becomes a metallic bond, the interface strength is improved. Therefore, it becomes possible to form a reinforced layer that exhibits excellent properties such as abrasion resistance and is difficult to peel off.
【０００７】[0007]
【実施例】以下、本発明の実施例を添付図面に基づいて
説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００８】図１は母材上に本発明の強化層を形成する
一例を示す図で、その（ａ）は母材上に溶射皮膜とろう
材層を形成した状態を示す断面図、（ｂ）は（ａ）に示
す母材を加熱処理した後の状態を示す断面図である。FIG. 1 is a diagram showing an example of forming the reinforcing layer of the present invention on a base material, and FIG. 1 (a) is a sectional view showing a state in which a thermal spray coating and a brazing material layer are formed on the base material, and FIG. [Fig. 4] is a cross-sectional view showing a state after heat treatment of the base material shown in (a).
【０００９】図１において、１はカーボンスチールなど
で成形される母材（例えば石炭の竪ミル分級器の羽根車
の一部）を示す。In FIG. 1, reference numeral 1 denotes a base material formed of carbon steel or the like (for example, a part of an impeller of a vertical mill classifier of coal).
【００１０】先ず、（ａ）に示すように、母材１の表面
に溶射皮膜２とろう材層３を形成する。溶射皮膜２は、
超硬合金（例えばＷＣ−12Ｃｏ）をプラズマ溶射、ガス
溶射等により母材１表面に溶射して形成される。溶射皮
膜２には気孔４、割れ５の欠陥が存在する。この溶射皮
膜２上に、ろう材（例えばＢＮｉ−１、銅系化合物、銀
系化合物があり、用途に応じて使用される）を塗布して
ろう材層３を形成する。ろう材層３を形成する手段とし
ては例えばＢＮｉ−１の粉末をペースト状にしたものを
はけ塗りする方法、プリント印刷、シルクスクリーンな
どがあり、プリント印刷やシルクスクリーンを用いる場
合には層厚のコントロールが容易に行える。First, as shown in (a), a sprayed coating 2 and a brazing material layer 3 are formed on the surface of a base material 1. The thermal spray coating 2 is
It is formed by spraying a cemented carbide (for example, WC-12Co) on the surface of the base material 1 by plasma spraying, gas spraying or the like. The thermal spray coating 2 has defects such as pores 4 and cracks 5. A brazing material (for example, BNi-1, a copper-based compound, a silver-based compound, which is used depending on the application) is applied onto the thermal spray coating 2 to form a brazing material layer 3. Means for forming the brazing material layer 3 include, for example, a method of brush-coating a paste of BNi-1 powder, print printing, silk screen, and the like. When print printing or silk screen is used, the layer thickness is Can be easily controlled.
【００１１】このろう材層３及び溶射皮膜２を有する母
材１を、不活性ガス例えばＡｒガス雰囲気中で、ろう材
が溶浸すると共に拡散するように加熱する。加熱温度
は、ろう材の溶融温度〜溶融温度＋ 200℃の範囲（ろう
材がＢＮｉ−１の場合には1000〜1200℃）とすることが
望ましい。これは、加熱温度がろう材の溶融温度未満の
場合にはろう材が溶融せず、溶融温度＋ 200℃より高い
場合にはろう材が溶け過ぎるからである。また、加熱時
間は 2〜3.5 時間とすることが望ましく、加熱時間が 2
時間未満である場合にはろう材が十分に溶浸せず、3.5
時間を越える場合にはろう材が溶け過ぎる。The base material 1 having the brazing material layer 3 and the sprayed coating 2 is heated in an atmosphere of an inert gas such as Ar gas so that the brazing material is infiltrated and diffused. The heating temperature is preferably in the range of the melting temperature of the brazing material to the melting temperature + 200 ° C (1000 to 1200 ° C when the brazing material is BNi-1). This is because the brazing material does not melt when the heating temperature is lower than the melting temperature of the brazing material, and the brazing material melts too much when the heating temperature is higher than the melting temperature + 200 ° C. Also, it is desirable to set the heating time to 2 to 3.5 hours.
If it is less than the time, the brazing material does not fully infiltrate, and
If the time is exceeded, the brazing material will melt too much.
【００１２】このように、ろう材層３及び溶射皮膜２を
有する母材１を、Ａｒガス雰囲気中で加熱して浸透及び
拡散処理した後、これを冷却することにより、（ｂ）に
示すように、母材１上に４つの母材拡散層６、溶射拡散
層７、ろう付け拡散層８、ろう付け層９からなる強化層
１０が形成される。As described above, by heating the base material 1 having the brazing material layer 3 and the thermal spray coating 2 in an Ar gas atmosphere to permeate and diffuse the base material 1 and then to cool it, as shown in FIG. Then, the reinforcing layer 10 including the four base material diffusion layers 6, the thermal spray diffusion layer 7, the brazing diffusion layer 8 and the brazing layer 9 is formed on the base material 1.
【００１３】例えば、ＢＮｉ−１よりなるろう材層３と
ＷＣ−12Ｃｏよりなる溶射皮膜２を有する母材（カーボ
ンスチール）１を、1000〜1200℃の温度で 2〜3.5 時間
加熱する。すると、ろう材層３の一部が溶融して溶射皮
膜２に浸透し、皮膜２の気孔４、割れ５に入ると共に、
膜２が緻密な層（溶射拡散層７）になる。これは、１つ
には毛細管現象による、もう１つはろう材と溶射皮膜材
のなじみがよいからであると考えられる。また、ろう材
層３と溶射皮膜２との間で金属が拡散（ろう材のＮｉが
溶射皮膜に拡散）して、金属的に結合する波状のろう付
け拡散層８が形成されると共に、母材１と溶射皮膜２の
界面にも母材拡散層６が形成される。For example, a base material (carbon steel) 1 having a brazing material layer 3 made of BNi-1 and a thermal spray coating 2 made of WC-12Co is heated at a temperature of 1000 to 1200 ° C. for 2 to 3.5 hours. Then, a part of the brazing material layer 3 is melted and penetrates into the thermal spray coating 2, and enters the pores 4 and the cracks 5 of the coating 2,
The film 2 becomes a dense layer (sprayed diffusion layer 7). It is considered that one is due to the capillary phenomenon and the other is because the brazing material and the thermal spray coating material are well compatible with each other. In addition, the metal diffuses between the brazing material layer 3 and the thermal spray coating 2 (Ni of the brazing material diffuses into the thermal spray coating) to form a corrugated brazing diffusion layer 8 that is metallically coupled, and The base material diffusion layer 6 is also formed at the interface between the material 1 and the thermal spray coating 2.
【００１４】このように、ろう材層３の一部が溶融して
溶射皮膜２に浸透し、皮膜２の気孔４、割れ５に入るこ
とにより、封孔がなされて気孔４、割れ５の欠陥がなく
なるので、溶射皮膜２（溶射拡散層７）の強度向上、耐
蝕性の向上等が図れる。As described above, a part of the brazing filler metal layer 3 is melted and permeates into the thermal spray coating 2 and enters the pores 4 and cracks 5 of the coating 2, so that a sealing is performed and defects of the pores 4 and cracks 5 are formed. Therefore, the strength of the sprayed coating 2 (sprayed diffusion layer 7) and the corrosion resistance can be improved.
【００１５】また、加熱によりろう材層３と溶射皮膜２
との間で金属が拡散して金属的に結合する層（ろう付け
拡散層８）が生じると共に、母材１と溶射皮膜２の界面
に母材拡散層６が生じることにより、ろう材層３と溶射
皮膜２及び皮膜２と母材１の付着形態が拡散層の形式に
よる金属的結合にかわる。これにより、溶射のままでは
物理的アンカーリングによる付着形態であり、界面の強
度が小さく 400〜500℃以上の温度では剥離しやすい
が、拡散層の形式による金属的結合になると界面強度が
向上し、約 700〜800 ℃の温度でも剥離しにくくなる。
また、母材１の表面の硬さについては、母材１に溶射皮
膜２のみを形成した場合と比較すると、溶射のみではＨ
ｖ1180であったものがＨｖ1470と向上し、耐摩耗性が著
しく改善された。なお、硬さはビッカース硬さ計で測定
した。Further, the brazing material layer 3 and the thermal spray coating 2 are heated.
A layer (brazing diffusion layer 8) in which a metal diffuses and is metallically bonded is generated between the base metal 1 and the spray coating 2, and a base material diffusion layer 6 is formed at the interface between the base material 1 and the thermal spray coating 2. The form of adhesion between the sprayed coating 2 and the coating 2 and the base material 1 is replaced by metallic bonding in the form of a diffusion layer. As a result, it remains in the form of adhesion by physical anchoring as it is as it is by thermal spraying, and the strength of the interface is small and it easily peels off at temperatures of 400 to 500 ° C or higher, but when it becomes a metallic bond due to the form of the diffusion layer, the interface strength improves. , It becomes difficult to peel even at a temperature of about 700 to 800 ° C.
As for the hardness of the surface of the base material 1, when compared with the case where only the thermal spray coating 2 is formed on the base material 1, only H is H
What was v1180 was improved to Hv1470, and wear resistance was remarkably improved. The hardness was measured with a Vickers hardness meter.
【００１６】従って、母材１の表面に、超硬合金の溶射
皮膜２を形成し、この溶射皮膜２上にろう材を塗布した
後、これを不活性ガス雰囲気で加熱して、ろう材を溶浸
させると共に拡散させることで、母材１の表面に、耐摩
耗性等に優れた特性を示すと共に剥離しにくい強化層１
０を形成することができる。Therefore, a sprayed coating 2 of cemented carbide is formed on the surface of the base material 1, a brazing material is applied on the sprayed coating 2, and the brazing material is heated in an inert gas atmosphere to form a brazing material. By infiltrating and diffusing, the reinforcing layer 1 which exhibits excellent wear resistance and the like on the surface of the base material 1 and is hard to peel off
0 can be formed.
【００１７】[0017]
【発明の効果】以上要するに本発明によれば、母材の表
面に、耐摩耗性等に優れた特性を示すと共に剥離しにく
い強化層を形成することができるという優れた効果を発
揮する。In summary, according to the present invention, it is possible to form a reinforced layer on the surface of the base material, which exhibits excellent properties such as abrasion resistance and is resistant to peeling.
【図１】本発明の一実施例を示す図で、その（ａ）は母
材上に溶射皮膜とろう材層を形成した状態を示す断面
図、（ｂ）は（ａ）に示す母材を加熱処理した後の状態
を示す断面図である。FIG. 1 is a view showing an embodiment of the present invention, in which (a) is a cross-sectional view showing a state in which a thermal spray coating and a brazing material layer are formed on a base material, and (b) is a base material shown in (a). FIG. 3 is a cross-sectional view showing a state after heat treatment of the.
【図２】従来例を示す断面図である。FIG. 2 is a sectional view showing a conventional example.
１ 母材 ２ 溶射皮膜 ３ ろう材層 １０ 強化層 1 Base material 2 Thermal spray coating 3 Brazing material layer 10 Reinforcement layer
Claims (1)
て、上記母材の表面に、超硬合金の溶射皮膜を形成し、
該溶射皮膜上にろう材を塗布した後、これを不活性ガス
雰囲気で加熱して、ろう材を溶浸させると共に拡散させ
ることを特徴とする母材の強化層形成方法。1. When forming a reinforcing layer on the surface of a base material, a sprayed coating of cemented carbide is formed on the surface of the base material,
A method for forming a reinforcing layer of a base material, comprising applying a brazing material on the sprayed coating and then heating the brazing material in an inert gas atmosphere to infiltrate and diffuse the brazing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11060793A JPH06322553A (en) | 1993-05-12 | 1993-05-12 | Formation of reinforcing layer on base material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11060793A JPH06322553A (en) | 1993-05-12 | 1993-05-12 | Formation of reinforcing layer on base material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06322553A true JPH06322553A (en) | 1994-11-22 |
Family
ID=14540127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11060793A Pending JPH06322553A (en) | 1993-05-12 | 1993-05-12 | Formation of reinforcing layer on base material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06322553A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007528297A (en) * | 2004-01-09 | 2007-10-11 | 昭和電工株式会社 | HEAT EXCHANGER, MANUFACTURING METHOD THEREOF, AND HEAT EXCHANGER TUBE |
| JP2021038629A (en) * | 2019-09-02 | 2021-03-11 | チャイナ イノベーション アカデミー オブ インテリジェント イクイップメント カンパニー．，リミテッド．Ｃｈｉｎａ Ｉｎｎｏｖａｔｉｏｎ Ａｃａｄｅｍｙ Ｏｆ Ｉｎｔｅｌｌｉｇｅｎｔ Ｅｑｕｉｐｍｅｎｔ Ｃｏ．，Ｌｔｄ． | Wear-resistant film layer, method for forming the same, cutter ring for roller cutter for shield machine, roller cutter for shield machine, and shield machine |
-
1993
- 1993-05-12 JP JP11060793A patent/JPH06322553A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007528297A (en) * | 2004-01-09 | 2007-10-11 | 昭和電工株式会社 | HEAT EXCHANGER, MANUFACTURING METHOD THEREOF, AND HEAT EXCHANGER TUBE |
| JP2021038629A (en) * | 2019-09-02 | 2021-03-11 | チャイナ イノベーション アカデミー オブ インテリジェント イクイップメント カンパニー．，リミテッド．Ｃｈｉｎａ Ｉｎｎｏｖａｔｉｏｎ Ａｃａｄｅｍｙ Ｏｆ Ｉｎｔｅｌｌｉｇｅｎｔ Ｅｑｕｉｐｍｅｎｔ Ｃｏ．，Ｌｔｄ． | Wear-resistant film layer, method for forming the same, cutter ring for roller cutter for shield machine, roller cutter for shield machine, and shield machine |
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