JPH11323528A - Method for improving wear resistance of nickel-chromium alloy - Google Patents
Method for improving wear resistance of nickel-chromium alloyInfo
- Publication number
- JPH11323528A JPH11323528A JP12850398A JP12850398A JPH11323528A JP H11323528 A JPH11323528 A JP H11323528A JP 12850398 A JP12850398 A JP 12850398A JP 12850398 A JP12850398 A JP 12850398A JP H11323528 A JPH11323528 A JP H11323528A
- Authority
- JP
- Japan
- Prior art keywords
- nickel
- chromium alloy
- wear resistance
- sprayed
- chromium
- 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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ニッケルクロム合
金の耐摩耗性向上方法に関する。The present invention relates to a method for improving the wear resistance of a nickel-chromium alloy.
【０００２】[0002]
【従来の技術】ボイラの炉壁、例えばアッシュやスラブ
を除去するために蒸気等を吹きつけるウォールディスラ
ガやスートブロアを設置する炉壁は、耐摩耗性を向上さ
せる必要がある。そのため、従来から、ニッケルクロム
合金、セラミックス、サーメット等が耐摩耗性を必要と
する部分に溶射されていた。2. Description of the Related Art A furnace wall of a boiler, for example, a wall for installing a wall dislager or a soot blower for spraying steam or the like for removing ash or slab, needs to have improved wear resistance. For this reason, conventionally, nickel chromium alloys, ceramics, cermets, and the like have been sprayed onto portions requiring wear resistance.
【０００３】[0003]
【発明が解決しようとする課題】ニッケルクロム合金
は、クロムを４０〜６０％含む高ニッケル合金であり、
比較的コストが安く、施工も容易であるが、皮膜の硬さ
がＨｖ３００〜４００程度であり、ウォールディスラガ
近傍のように摩耗が激しい炉壁には、硬度が不足して適
用できない問題点があった。The nickel chromium alloy is a high nickel alloy containing 40 to 60% of chromium,
Although the cost is relatively low and the construction is easy, the hardness of the coating is about Hv300 to 400, and the furnace wall which is severely worn such as in the vicinity of the wall dislager has a problem that the hardness is insufficient and cannot be applied. there were.
【０００４】また、セラミックスは、硬度が高く（例え
ばＨｖ６００程度）、摩耗が激しい部分への溶射材料と
して適しているが、反面、施工が困難であり、施工コス
トが高い難点があった。更に、セラミックスと金属の複
合材料であるサーメットも、硬度が高く耐摩耗性に優れ
ているが、やはり、施工が困難であり、施工コストが高
い難点があった。[0004] Ceramics have a high hardness (for example, about Hv600) and are suitable as a thermal spraying material for a severely abraded portion. However, on the other hand, they are difficult to construct and have a high construction cost. Further, the cermet, which is a composite material of ceramics and metal, also has high hardness and excellent abrasion resistance, but also has difficulty in construction and high construction cost.
【０００５】本発明は、かかる要望を満たすために創案
されたものである。すなわち、本発明の目的は、比較的
コストが安く、施工も容易であるニッケルクロム合金を
溶射材料として用い、その耐摩耗性を向上させることが
できるニッケルクロム合金の耐摩耗性向上方法を提供す
ることにある。[0005] The present invention has been devised to satisfy such a demand. That is, an object of the present invention is to provide a method for improving the wear resistance of a nickel-chromium alloy, which is capable of improving its wear resistance by using a nickel-chromium alloy which is relatively inexpensive and easy to apply as a thermal spray material. It is in.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、ニッケ
ルクロム合金を溶射して溶射皮膜を形成し、次いで該溶
射皮膜を約５００℃以上，約８００℃以下に長時間加熱
して組成中にニッケルクロム金属間化合物を析出させ
る、ことを特徴とするニッケルクロム合金の耐摩耗性向
上方法が提供される。According to the present invention, a nickel chromium alloy is sprayed to form a sprayed coating, and then the sprayed coating is heated to about 500 ° C. or more and about 800 ° C. or less for a long time. A method for improving the wear resistance of a nickel-chromium alloy, characterized in that a nickel-chromium intermetallic compound is precipitated.
【０００７】ＮｉとＣｒの合金状態図中に、Ｃｒが約２
０〜４０重量％、温度約５００〜６００℃の領域に、
γ’相が存在する。このγ’相は、硬度の高いＮｉ2 Ｃ
ｒからなるため、その相を析出させることにより、ニッ
ケルクロム合金の溶射皮膜の硬度を増大させることがで
きる。本発明はかかる新規の知見に基づくものである。[0007] In the alloy phase diagram of Ni and Cr, Cr
0-40% by weight, temperature about 500-600 ° C
There is a γ 'phase. This γ 'phase is made of Ni 2 C having high hardness.
Therefore, the hardness of the sprayed coating of the nickel-chromium alloy can be increased by depositing the phase. The present invention is based on such a new finding.
【０００８】すなわち、上述した本発明の方法により、
ニッケルクロム合金の溶射皮膜を形成後、この溶射皮膜
を約５００℃以上，約８００℃以下に長時間加熱するこ
とにより、組成中にニッケルクロム金属間化合物（Ｎｉ
2 Ｃｒからなるγ’相）を析出させることができる。こ
の結果、例えば約１００時間の加熱により、溶射のまま
ではＨｖ３００〜４００程度であったニッケルクロム合
金の溶射皮膜硬度を、時効効果により、Ｈｖ約５００〜
約７００程度まで高めることができることが、試験結果
から確認された。従って、この方法により、比較的コス
トが安く、施工も容易であるニッケルクロム合金を溶射
材料として用い、その耐摩耗性を向上させることができ
る。That is, according to the method of the present invention described above,
After forming a sprayed coating of a nickel-chromium alloy, the sprayed coating is heated to about 500 ° C. or more and about 800 ° C. or less for a long time, so that the nickel-chromium intermetallic compound (Ni
Consisting 2 Cr gamma 'phase) can be precipitated. As a result, for example, by heating for about 100 hours, the thermal spray coating hardness of the nickel-chromium alloy, which was about 300 to 400 Hv as it was sprayed, was reduced to about 500 to 500 Hv by the aging effect.
It was confirmed from the test results that it could be increased to about 700. Therefore, according to this method, a nickel chromium alloy, which is relatively inexpensive and easy to apply, is used as a thermal spray material, and its wear resistance can be improved.
【０００９】[0009]
【発明の実施の形態】以下、本発明の好ましい実施形態
を図面を参照して説明する。図１は、Ｎｉ−Ｃｒ合金の
状態図である。この図において、横軸はＣｒの含有率、
縦軸は状態温度である。また、左端の縦軸は、Ｎｉ１０
０％、Ｃｒ０％であり、右端の縦軸は、Ｃｒ１００％、
Ｎｉ０％を示している。この図から、Ｃｒが約２０〜４
０重量％、温度約５００〜６００℃の領域に、γ’相が
存在することがわかる。このγ’相は、硬度の高いＮｉ
2 Ｃｒからなるため、この相を析出させることにより、
ニッケルクロム合金の溶射皮膜の硬度を増大させること
ができることがわかる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a state diagram of a Ni—Cr alloy. In this figure, the horizontal axis is the Cr content,
The vertical axis is the state temperature. The vertical axis at the left end is Ni10
0% and Cr 0%, and the vertical axis at the right end is Cr 100%,
Ni 0% is shown. From this figure, it can be seen that Cr is about 20-4.
It can be seen that the γ ′ phase exists in the region of 0% by weight and the temperature of about 500 to 600 ° C. This γ 'phase is composed of Ni
Since it is composed of 2Cr, this phase is precipitated,
It can be seen that the hardness of the sprayed nickel chromium alloy film can be increased.
【００１０】図２は、本発明の耐摩耗性向上方法を示す
ブロック図である。この図に示すように、本発明の方法
は、溶射工程２と時効処理工程４からなる。溶射工程２
では、クロム（Ｃｒ）を約４０〜６０％含むニッケルク
ロム合金を溶射して溶射皮膜を形成する。次いで、時効
処理工程４では、形成した溶射皮膜を約５００℃以上，
約８００℃以下に長時間加熱して組成中にニッケルクロ
ム金属間化合物を析出させる。FIG. 2 is a block diagram showing a method for improving wear resistance according to the present invention. As shown in this figure, the method of the present invention includes a thermal spraying step 2 and an aging treatment step 4. Thermal spraying process 2
Then, a thermal spray coating is formed by spraying a nickel-chromium alloy containing about 40 to 60% of chromium (Cr). Next, in the aging treatment step 4, the formed thermal spray coating is heated to about 500 ° C. or more.
It is heated to about 800 ° C. or less for a long time to precipitate a nickel-chromium intermetallic compound in the composition.
【００１１】ニッケルクロム合金を溶射して溶射皮膜を
形成する工程（溶射工程２）は、従来周知の溶射工程と
同一で良い。この場合に例えば炉壁表面に形成される溶
射皮膜は、一旦溶融後に炉壁表面で急冷されて約２００
〜３００℃となるため、そのままでは、上述したγ’相
は形成されない。しかし、時効処理工程４において、形
成した溶射皮膜を約５００℃以上，約８００℃以下に長
時間加熱することにより、組成中にニッケルクロム金属
間化合物を析出させることができる。この金属間化合物
の組成は、上述したγ’相（Ｎｉ2 Ｃｒ）からなり、例
えば１００時間以上の十分な時間加熱を継続することに
より、いわゆる時効効果を起こすことができる。The step of spraying a nickel chromium alloy to form a sprayed coating (spraying step 2) may be the same as the conventionally known spraying step. In this case, for example, the sprayed coating formed on the furnace wall surface is quenched once on the furnace wall surface after being melted, and about 200 mm.
Since the temperature is up to 300 ° C., the above-mentioned γ ′ phase is not formed as it is. However, in the aging treatment step 4, the nickel-chromium intermetallic compound can be precipitated in the composition by heating the formed thermal spray coating to about 500 ° C. or more and about 800 ° C. or less for a long time. The composition of the intermetallic compound is composed of the γ ′ phase (Ni 2 Cr) described above, and a so-called aging effect can be caused by continuing the heating for a sufficient period of time, for example, 100 hours or more.
【００１２】[0012]
【実施例】図３は、本発明の方法による時効温度と溶射
皮膜の硬さとの関係図である。この図において、横軸は
時効効果を起こさせるために保持した温度（時効温度：
℃）、縦軸は、時効効果後の硬度（Ｈｖ）であり、図中
の各○は試験結果を示している。なお、この試験におい
て、溶射材は５０Ｃｒ−５０Ｎｉであり、温度の保持時
間は１００時間である。この図から、溶射工程２による
溶射のままの溶射皮膜の硬さは、Ｈｖ約４００未満にす
ぎないが、時効処理工程４において時効温度を高めるほ
ど硬さが増し、約５００℃以上，約８００℃以下の範囲
で硬度をＨｖ約５００〜約７００程度まで高めることが
できることがわかる。なお、この結果からは、約８００
℃以上の高温においても時効硬化が期待できるが、図１
に示した状態図から約８００℃以上の高温保持により、
γ’相自体が他の相に変わる可能性があり、かつ炉壁等
を劣化させるおそれもあるので、約８００℃以下にとど
めることが望ましい。FIG. 3 is a diagram showing the relationship between the aging temperature and the hardness of the sprayed coating according to the method of the present invention. In this figure, the horizontal axis represents the temperature held to cause the aging effect (aging temperature:
° C), and the vertical axis indicates hardness (Hv) after the aging effect, and each circle in the figure indicates a test result. In this test, the sprayed material was 50Cr-50Ni, and the temperature holding time was 100 hours. From this figure, the hardness of the thermal spray coating as sprayed in the thermal spraying step 2 is only less than about 400 Hv, but the hardness increases as the aging temperature is increased in the aging treatment step 4; It can be seen that the hardness can be increased to about 500 to about 700 Hv in the range of not more than ℃. From this result, about 800
Age hardening can be expected even at high temperatures of over ℃.
By holding at a high temperature of about 800 ° C or more from the state diagram shown in
Since the γ 'phase itself may change to another phase and may deteriorate the furnace wall and the like, it is preferable to keep the temperature at about 800 ° C. or less.
【００１３】上述した本発明の方法により、ニッケルク
ロム合金の溶射皮膜を形成後、この溶射皮膜を約５００
℃以上，約８００℃以下に長時間加熱することにより、
組成中にニッケルクロム金属間化合物（Ｎｉ2 Ｃｒから
なるγ’相）を析出させることができる。この結果、例
えば約１００時間の加熱により、溶射のままではＨｖ３
００〜４００程度であったニッケルクロム合金の溶射皮
膜硬度を、時効効果により、Ｈｖ約５００〜約７００程
度まで高めることができることが、試験結果から確認さ
れた。従って、この方法により、比較的コストが安く、
施工も容易であるニッケルクロム合金を溶射材料として
用い、その耐摩耗性を向上させることができる。After forming a sprayed coating of a nickel-chromium alloy by the above-described method of the present invention, the sprayed coating is applied for about 500 hours.
By heating for a long time above ℃, about 800 ℃
A nickel-chromium intermetallic compound (γ ′ phase composed of Ni 2 Cr) can be precipitated in the composition. As a result, for example, by heating for about 100 hours, Hv3
From the test results, it was confirmed that the thermal spray coating hardness of the nickel chromium alloy, which was about 00 to 400, could be increased to about 500 to about 700 Hv by the aging effect. Therefore, this method is relatively inexpensive,
A nickel chromium alloy, which is easy to apply, can be used as a thermal spray material to improve its wear resistance.
【００１４】なお、本発明は上述した実施形態に限定さ
れず、本発明の要旨を逸脱しない範囲で種々変更できる
ことは勿論である。It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.
【００１５】[0015]
【発明の効果】上述したように、本発明の方法によれ
ば、通常、ニッケルクロム合金の溶射材は溶射のまま使
用されるが、単純な熱処理を実施することにより、セラ
ミックス系材料と同等の耐摩耗性を付与することができ
る。従って、比較的、低コストのニッケルクロム合金
で、同等の耐摩耗性を得ることができる。As described above, according to the method of the present invention, a nickel-chromium alloy sprayed material is usually used as sprayed, but by performing a simple heat treatment, the same material as a ceramic material can be obtained. Abrasion resistance can be imparted. Therefore, the same wear resistance can be obtained with a relatively low-cost nickel-chromium alloy.
【００１６】上述したように、本発明のニッケルクロム
合金の耐摩耗性向上方法は、比較的コストが安く、施工
も容易であるニッケルクロム合金を溶射材料として用
い、その耐摩耗性を向上させることができる、等の優れ
た効果を有する。As described above, the method for improving the wear resistance of a nickel-chromium alloy of the present invention uses a nickel-chromium alloy, which is relatively inexpensive and easy to apply, as a thermal spraying material and improves the wear resistance thereof. Has excellent effects such as
【図１】Ｎｉ−Ｃｒ合金の状態図である。FIG. 1 is a phase diagram of a Ni—Cr alloy.
【図２】本発明の耐摩耗性向上方法を示すブロック図で
ある。FIG. 2 is a block diagram showing a method for improving wear resistance according to the present invention.
【図３】本発明の方法による時効温度と溶射皮膜の硬さ
との関係図である。FIG. 3 is a graph showing the relationship between the aging temperature and the hardness of a sprayed coating according to the method of the present invention.
２ 溶射工程 ４ 時効処理工程 2 Thermal spraying process 4 Aging treatment process
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１０年７月１０日[Submission date] July 10, 1998
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】発明の名称[Correction target item name] Name of invention
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【発明の名称】 ニッケルクロム合金の耐摩耗性向上方
法Patent application title: Method for improving wear resistance of nickel chromium alloy
Claims (1)
を形成し、次いで該溶射皮膜を約５００℃以上，約８０
０℃以下に長時間加熱して組成中にニッケルクロム金属
間化合物を析出させる、ことを特徴とするニッケルクロ
ム合金の耐摩耗性向上方法。A nickel chromium alloy is sprayed to form a sprayed coating.
A method for improving the wear resistance of a nickel-chromium alloy, comprising heating to 0 ° C. or less for a long time to precipitate a nickel-chromium intermetallic compound in the composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12850398A JPH11323528A (en) | 1998-05-12 | 1998-05-12 | Method for improving wear resistance of nickel-chromium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12850398A JPH11323528A (en) | 1998-05-12 | 1998-05-12 | Method for improving wear resistance of nickel-chromium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11323528A true JPH11323528A (en) | 1999-11-26 |
Family
ID=14986363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12850398A Pending JPH11323528A (en) | 1998-05-12 | 1998-05-12 | Method for improving wear resistance of nickel-chromium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11323528A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676455A (en) * | 2015-11-04 | 2017-05-17 | 中国人民解放军装甲兵工程学院 | Method for improving contact fatigue performance by combining texturing and coating process optimization |
| CN116397123A (en) * | 2023-06-08 | 2023-07-07 | 西安热工研究院有限公司 | Abrasion resistant high nickel chromium/B 2 O 3 Material, preparation method and application thereof |
-
1998
- 1998-05-12 JP JP12850398A patent/JPH11323528A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676455A (en) * | 2015-11-04 | 2017-05-17 | 中国人民解放军装甲兵工程学院 | Method for improving contact fatigue performance by combining texturing and coating process optimization |
| CN106676455B (en) * | 2015-11-04 | 2019-08-02 | 中国人民解放军装甲兵工程学院 | The method of raising contact fatigue property is combined in a kind of texturing with coating process optimization |
| CN116397123A (en) * | 2023-06-08 | 2023-07-07 | 西安热工研究院有限公司 | Abrasion resistant high nickel chromium/B 2 O 3 Material, preparation method and application thereof |
| CN116397123B (en) * | 2023-06-08 | 2023-09-08 | 西安热工研究院有限公司 | Abrasion resistant high nickel chromium/B 2 O 3 Material, preparation method and application thereof |
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