JPH07305159A - Production of boiler member - Google Patents
Production of boiler memberInfo
- Publication number
- JPH07305159A JPH07305159A JP12185794A JP12185794A JPH07305159A JP H07305159 A JPH07305159 A JP H07305159A JP 12185794 A JP12185794 A JP 12185794A JP 12185794 A JP12185794 A JP 12185794A JP H07305159 A JPH07305159 A JP H07305159A
- Authority
- JP
- Japan
- Prior art keywords
- boiler
- nichrome
- chromium carbide
- sprayed
- coating
- 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]
【産業上の利用分野】本発明は、耐摩耗性に優れたボイ
ラ用部材の製造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 manufacturing a boiler member having excellent wear resistance.
【０００２】[0002]
【従来の技術】石炭焚きボイラや流動床ボイラ等のボイ
ラにおいては、高温下で灰や砂により激しいアッシュエ
ロージョンを受ける。このアッシュエロージョンにより
定期的に部材の補修や交換が行われ、多大な時間と費用
を要している。又運転中にボイラチューブ等が、摩耗に
より穴があき、運転を停止する等の事故も多く、安定操
業の面からも耐摩耗性向上、長期メンテナンスフリー化
が求められている。2. Description of the Related Art Boilers such as coal-fired boilers and fluidized bed boilers are subjected to severe ash erosion due to ash and sand at high temperatures. Due to this ash erosion, the members are regularly repaired and replaced, which requires a great deal of time and cost. In addition, there are many accidents such as the operation of the boiler tube being punctured due to wear during operation and stopping the operation, and there is a demand for improved wear resistance and long-term maintenance-free operation in terms of stable operation.
【０００３】そこで、ボイラ用部材にも応用出来る材料
の表面被膜法として、特開平２−６１０５１号公報に示
されるような、クロム炭化物粒子とメタル粒子とを混合
した炭化物−メタル複合粉末を、材料の表面に溶射し、
これを３００〜８００℃で熱処理して溶射皮膜中に酸化
クロムを生成させる方法がある。Therefore, as a surface coating method of a material which can be applied to a member for a boiler, a carbide-metal composite powder obtained by mixing chromium carbide particles and metal particles as shown in JP-A-2-61051 is used. Sprayed on the surface of
There is a method of heat-treating this at 300 to 800 ° C. to generate chromium oxide in the thermal spray coating.
【０００４】しかるに、この特開平２−６１０５１号公
報に示される方法は、溶射皮膜中に酸化クロムを生成さ
せる為、熱処理は大気中，水蒸気中若しくは酸化性雰囲
気中で行うので、溶射皮膜のマイクロクラック及び皮膜
と母材界面の酸化を生じ、これが後に皮膜の割れ、剥
離、母材の酸化を生じ易くする要因となっていた。However, in the method disclosed in Japanese Patent Laid-Open No. 2-61051, the heat treatment is carried out in the atmosphere, in steam or in an oxidizing atmosphere in order to generate chromium oxide in the thermal spray coating. Cracks and oxidation at the interface between the coating and the base material were generated, which was a factor that later facilitated cracking, peeling of the coating, and oxidation of the base material.
【０００５】[0005]
【発明が解決しようとする課題】本発明では、上記従来
技術の問題点を解消し、皮膜のマイクロクラック及び皮
膜と母材界面の酸化を生じさせない強固な粒子間結合を
有した緻密な皮膜、さらに割れのないねばりのある皮膜
を有し、耐食性、耐摩耗性に富むボイラ用部材を得るこ
とを目的としている。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides a dense coating having a strong interparticle bond that does not cause microcracks of the coating and oxidation of the interface between the coating and the base material. Further, it has an object to obtain a member for a boiler having a non-cracking, sticky film and being excellent in corrosion resistance and wear resistance.
【０００６】[0006]
【課題を解決するための手段】本発明は、ボイラ用部材
の表面に、クロムカーバイドーニクロム複合材料をプラ
ズマ溶射し、該溶射皮膜を非酸化性雰囲気中で７００〜
１０００℃で熱処理することを特徴とする。非酸化性雰
囲気としては、真空，Ｎ2 若しくはＡｒが有効である。SUMMARY OF THE INVENTION According to the present invention, a chromium carbide nichrome composite material is plasma sprayed on the surface of a boiler member, and the sprayed coating is heated to 700-700 in a non-oxidizing atmosphere.
It is characterized in that it is heat-treated at 1000 ° C. Vacuum, N 2 or Ar is effective as the non-oxidizing atmosphere.
【０００７】上記本発明において、熱処理温度を７００
〜１０００℃とするのは、７００℃未満の熱処理品で
は、殆ど耐摩耗性の向上が認められず、一方１０００℃
を越えると熱影響により部材が変形してしまうからであ
る。In the present invention, the heat treatment temperature is 700
The heat treatment product of less than 700 ° C shows almost no improvement in wear resistance, while 1000 ° C is 1000 ° C.
This is because if the temperature exceeds, the member will be deformed due to the influence of heat.
【０００８】[0008]
【作用】クロムカーバイドーニクロム複合材料を基材に
溶射した後、大気中を含む酸化性雰囲気で熱処理をすれ
ば、皮膜の硬度上昇と共に、耐摩耗性の向上が認められ
るものの、皮膜自体が脆くなるが、本願発明の非酸化性
雰囲気の熱処理では硬度上昇はさほどなくても耐摩耗性
の向上が大きい。これは酸化性雰囲気では、酸化クロム
の生成により耐摩耗性が向上したものと考えられるが、
非酸化性雰囲気では酸化クロムの生成ではなく、皮膜内
部の粒子間結合の増大によって皮膜自体のねばりが向上
したためと考えられる。[Function] When the chromium carbide nichrome composite material is sprayed on the base material and then heat-treated in an oxidizing atmosphere including the atmosphere, the hardness of the coating is increased and the abrasion resistance is improved, but the coating itself is Although it becomes brittle, the heat treatment in the non-oxidizing atmosphere of the present invention greatly improves the wear resistance even if the hardness is not so much increased. It is considered that this is because in an oxidizing atmosphere, the wear resistance is improved by the generation of chromium oxide,
It is considered that, in a non-oxidizing atmosphere, not the formation of chromium oxide but the increase in interparticle bonding inside the coating improved the stickiness of the coating itself.
【０００９】[0009]
【実施例】以下本発明をその実施例に基づいて詳細す
る。実施例１ クロムカーバイドーニクロム材料として、Ｃｒ3 Ｃ2 ／
８０重量％Ｎｉ２０重量％Ｃｒ複合粉末（Ｃｒ3 Ｃ2 は
７５重量％）を使用し、窒素ガス３５０ｌ／ｍｉｎ，ア
ルゴンガス１５０ｌ／ｍｉｎ，出力４５０Ｖ×５００Ａ
の条件でプラズマ溶射法により鋼板表面に溶射し、厚さ
３００μｍの溶射皮膜を形成した。EXAMPLES The present invention will be described in detail below based on examples thereof. Example 1 As a chromium carbide nichrome material, Cr 3 C 2 /
80 wt% Ni 20 wt% Cr composite powder (Cr 3 C 2 is 75 wt%) is used, nitrogen gas 350 l / min, argon gas 150 l / min, output 450 V × 500 A
Under the above conditions, the surface of the steel sheet was sprayed by the plasma spraying method to form a sprayed coating having a thickness of 300 μm.
【００１０】次に、真空，窒素（１気圧），アルゴン
（０．４Ｔｏｒｒ）雰囲気で、７００〜１０００℃の範
囲で、０．５時間から２時間の範囲で熱処理を施した。
熱処理された溶射皮膜の断面ビッカース硬度（荷重３０
０ｇ）の測定を行った。比較として溶射のままの溶射皮
膜についても同様の測定を行った。それらの結果を表１
に示す。Then, heat treatment was performed in a vacuum, nitrogen (1 atm), and argon (0.4 Torr) atmosphere at 700 to 1000 ° C. for 0.5 to 2 hours.
Cross-sectional Vickers hardness of the heat-treated sprayed coating (load 30
0 g) was measured. For comparison, the same measurement was performed on the sprayed coating as it was. The results are shown in Table 1.
Shown in.
【００１１】[0011]
【表１】 [Table 1]
【００１２】また、これらの溶射皮膜について粉体摩耗
試験を行った。試験結果を表２に示す。この試験は、９
０°の角度より＃１６のサンドを８．０mmφのノズル，
５kg/Cm2の圧力で吹きつけて、その試験前後の重量変化
を測定することによって求めた。表２は、比較のテスト
ピースの溶射のままを１００としたときの他の熱処理品
の比較値を示している。A powder abrasion test was conducted on these thermal spray coatings. The test results are shown in Table 2. This test is 9
No. 16 sand from the angle of 0 °, the nozzle of 8.0mmφ,
It was determined by spraying at a pressure of 5 kg / Cm 2 and measuring the weight change before and after the test. Table 2 shows comparative values of other heat-treated products when the thermal spraying of the comparative test piece was 100.
【００１３】[0013]
【表２】 [Table 2]
【００１４】上記結果より、非酸化性雰囲気で熱処理し
た溶射皮膜は、硬度がそれほど上昇していなくても（大
気中の熱処理では８００℃でＨｖ300 ＝１１００まで上
昇する）、耐摩耗性の向上が認められることが判る。こ
のことは、大気中の熱処理では酸化クロムの生成によ
り、硬度の上昇を伴ない耐摩耗性が向上すると考えられ
るが、非酸化性雰囲気での熱処理では、酸化クロムの生
成ではなく、皮膜内部の拡散によって粒子間結合が増大
し、皮膜自体のねばりが向上したためと考えられる。From the above results, the thermal spray coating heat-treated in a non-oxidizing atmosphere has improved wear resistance even if the hardness does not increase so much (Hv 300 = 1100 at 800 ° C. at heat treatment in air). It can be seen that This means that the heat resistance in the atmosphere improves the wear resistance due to the increase in hardness due to the generation of chromium oxide, but the heat treatment in the non-oxidizing atmosphere does not cause the generation of chromium oxide, but rather the inside of the film. It is considered that the diffusion increased the inter-particle bonds and improved the stickiness of the film itself.
【００１５】実施例２ 火力発電所の石炭焚きボイラの過熱器管及び再熱器管の
プロテクタに表３に示す条件で施工したものについて、
１年間の実証試験を行った。溶射施工品の溶射材料は実
施例１と同じものを使用し、膜厚３００μｍとした。大
気中の熱処理は８００℃で１時間，真空中のものは８５
０℃で１時間熱処理を行った。未施工品はＳＴＢ材であ
る。表３には１年間使用後のプロテクタの外観、摩耗状
態及び組織観察を示す。 Example 2 For the protectors of the superheater tube and the reheater tube of the coal-fired boiler of the thermal power plant, which were constructed under the conditions shown in Table 3,
A one-year verification test was conducted. The same material as in Example 1 was used as the thermal spray material, and the film thickness was 300 μm. Heat treatment in air at 800 ° C for 1 hour, vacuum heat treatment at 85
Heat treatment was performed at 0 ° C. for 1 hour. The unconstructed products are STB materials. Table 3 shows the appearance, wear state and microstructure observation of the protector after one year of use.
【００１６】[0016]
【表３】 [Table 3]
【００１７】表３の結果より、未施工品と比べると溶射
を施したプロテクタは耐摩耗性の向上が認められ、腐食
の影響も受けていないが、溶射のままと大気中熱処理し
たプロテクタにはクラックが発生していた。真空中で熱
処理したプロテクタにはクラックは認められなかった。
このことからも本発明方法は耐摩耗性と耐食性を向上さ
せる方法であることが実証された。The results shown in Table 3 show that the protector subjected to thermal spraying has improved wear resistance and is not affected by corrosion as compared with the untreated product, but the protector subjected to thermal treatment in the air as it is sprayed is not affected by corrosion. There was a crack. No crack was observed in the protector heat-treated in vacuum.
From this, it was proved that the method of the present invention is a method of improving wear resistance and corrosion resistance.
【００１８】[0018]
【発明の効果】以上説明して来た如く、本発明方法によ
れば、溶射皮膜の粒子間結合の増大によって溶射皮膜が
ねばり強くなるため、耐アッシュエロージョン対策とし
て、操業の安定化、長期メンテナンスフリー化及びコス
トの低減化を図ることが出来るものである。As described above, according to the method of the present invention, since the sprayed coating becomes tenacious due to the increase in the interparticle bond of the sprayed coating, the operation is stable and the maintenance is long-term free as a measure against ash erosion resistance. And cost reduction.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 今泉 幸男 福岡県福岡市中央区渡辺通二丁目１番82号 九州電力株式会社内 (72)発明者 山田 謙一 福岡県糟屋郡粕屋町大字仲原2804−１ 山 田金属防蝕株式会社内 (72)発明者 水戸 芳一 福岡県糟屋郡粕屋町大字仲原2804−１ 山 田金属防蝕株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yukio Imaizumi 2-82 Watanabe Dori, Chuo-ku, Fukuoka, Fukuoka Prefecture Kyushu Electric Power Co., Inc. (72) Kenichi Yamada 2804 Nakahara, Kasuya-cho, Kasuya-gun, Fukuoka Prefecture 1 Yamada Metal Corrosion Protection Co., Ltd. (72) Inventor Yoshikazu Mito 2804-1, Nakahara, Kasuya-cho, Kasuya-gun, Fukuoka Prefecture Yamada Metal Corrosion Protection Co., Ltd.
Claims (2)
ドーニクロム複合材料をプラズマ溶射し、該溶射皮膜を
非酸化性雰囲気中で７００〜１０００℃で熱処理を行う
ことを特徴としたボイラ用部材の製造方法。1. A boiler member characterized in that a chromium carbide nichrome composite material is plasma-sprayed on the surface of the boiler member, and the sprayed coating is heat-treated at 700 to 1000 ° C. in a non-oxidizing atmosphere. Manufacturing method.
Ａｒ中であることを特徴とした請求項１記載のボイラ用
部材の製造方法。2. The method for manufacturing a boiler member according to claim 1, wherein the non-oxidizing atmosphere is vacuum, N 2 or Ar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12185794A JPH07305159A (en) | 1994-05-10 | 1994-05-10 | Production of boiler member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12185794A JPH07305159A (en) | 1994-05-10 | 1994-05-10 | Production of boiler member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07305159A true JPH07305159A (en) | 1995-11-21 |
Family
ID=14821657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12185794A Pending JPH07305159A (en) | 1994-05-10 | 1994-05-10 | Production of boiler member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07305159A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014069180A1 (en) | 2012-10-31 | 2014-05-08 | 福田金属箔粉工業株式会社 | Ni-Cr-Co-BASED ALLOY HAVING HIGH-TEMPERATURE CORROSION RESISTANCE PROPERTIES, AND POPPET VALVE HAVING SURFACE MODIFIED WITH SAME |
| CN112496329A (en) * | 2020-12-10 | 2021-03-16 | 湖南人文科技学院 | Spherical Cr with high apparent density3C2Preparation method of-NiCr thermal spraying powder |
-
1994
- 1994-05-10 JP JP12185794A patent/JPH07305159A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014069180A1 (en) | 2012-10-31 | 2014-05-08 | 福田金属箔粉工業株式会社 | Ni-Cr-Co-BASED ALLOY HAVING HIGH-TEMPERATURE CORROSION RESISTANCE PROPERTIES, AND POPPET VALVE HAVING SURFACE MODIFIED WITH SAME |
| US9441287B2 (en) | 2012-10-31 | 2016-09-13 | Fukuda Metal Foil & Powder Co., Ltd. | Ni-Cr-Co-based alloy having high-temperature corrosion resistance, and poppet valve surface-modified with the same |
| CN112496329A (en) * | 2020-12-10 | 2021-03-16 | 湖南人文科技学院 | Spherical Cr with high apparent density3C2Preparation method of-NiCr thermal spraying powder |
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