著者

折井 靖光 宮本 勇 丸尾 大 樫浦 英秋 大越 昌幸 村原 正隆 御代川 孝彦 豊田 浩一 大迫 寛樹 佐藤 博保 篠原 久典 小林 誠 堀木 保宏 土井 章裕 小海 文夫 島本 幸次郎 古賀 義紀 福田 健三 新納 弘之 井村 達哉 大花 継頼 大内 秋比古 永井 千秋 矢部 明 井本 吉信 中山 斌義 久保 宇市 西井 正信 杉本 俊一 清水 雄一 鈴木 伸武 河西 俊一 長瀬 智洋 遠藤 正雄 江口 洋介 津 田裕 佐藤 宏一 山根 啓嗣 森下 正浩 松本 明 千賀 洋之 仲前 一男 大同 雅人 甲藤 正人 黒澤 宏 奥田 昌宏 佐々木 亘 野澤 繁典 五十嵐 龍志 星野 聡 常見 明良 杉岡 幸次 緑川 克美 田代 英夫 北村 一典 市川 義博 菅野 晃 窪田 貴晴 水原 貴之 小林 正樹 辻原 清人 英 貢 古野志 健男 井口 哲 松吉 達郎 大家 利彦 山口 滋 森 実紀夫 関根 和雄 剣持 庸一 辻本 博 土居 功年 藤林 肇次 吉田 典生 中溝 佳幸 松原 真人 竹中 裕司 西前 順一 葛本 昌樹 趙 同栄 空閑 良寿 大山 俊之 武内 一夫 永田 伍雄 川崎 暢之 飯村 康紘 石井 忠浩 Zhao T. R.

出版者

The Laser Society of Japan

雑誌

レーザー研究 (ISSN:03870200)

巻号頁・発行日

vol.21, pp.129-134,143, 1993

著者

岡田 実 西口 公之 丸尾 大 谷 隆之

出版者

社団法人溶接学会

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.36, no.1, pp.44-52, 1967-01-25

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An excellent dense and oxide free coating of Ni-Cr-B-Si alloy was obtained by the shielded plasma spraying method as shown in the previous report. The present report describes certain effects of spraying conditions, such as spraying atmosphere and preheating of substrate surface, on the quality of coating. And the application of shield nozzle and its effect are also investigated in details. Usually, plasma spraying of Ni-Cr-B-Si alloy in the air makes a porous and oxide inclusive deposit, even with use of pure argon plasma jet. It may be seen that some of these defects were caused by the oxidation of droplets in spraying. Air contamination into the plasma flame up to 90% was detected in the quantitative gas analysis of plasma flame at a distance of 90mm from the torch. Spraying in argon atmosphere gave a somewhat better coated layer compared with the spraying in the air, but is far from being perfect. These results suggest that the protection of particle and substrate from oxidation is necessary but is insufficient for obtaining perfect coating. Furthermore, thermal problems in a process should be considered at the same time. As the result of atmospheric, thermal and kinetic considerations in the processes, shield spraying method has been proposed. In the shielded spraying of this alloy, the preheating of substrate has great effect on the bond between the coated layer and the substrate. For the specimen which is shield-sprayed without any preheating, a little amount of porosity was observed at the boundary. But almost perfeet metallurgical bonding is accomplished with local preheating (300℃) of substrate surface. As for the application of shield nozzle, a series of experiments were carried out to analize the effect of nozzle. Results as follows; (1) Spraying atmosphere is kept perfectly inert. (2) Shield nozzle has an effect of raising the heat transfer from the plasma flame to the particles and substrate, since the contamination of cold gas is completely shout off. (3) Application of shield nozzle makes it easy to preheat the substrate surface with a high effluent of heat flux. (4) Temperature and velocity of particle rise as a result of increase of thermal efficiency and velocity of plasma flame.

著者

岡田 実 西口 公之 丸尾 大 谷 隆之

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.36, no.1, pp.44-52, 1967

---

An excellent dense and oxide free coating of Ni-Cr-B-Si alloy was obtained by the shielded plasma spraying method as shown in the previous report. The present report describes certain effects of spraying conditions, such as spraying atmosphere and preheating of substrate surface, on the quality of coating. And the application of shield nozzle and its effect are also investigated in details.<BR>Usually, plasma spraying of Ni-Cr-B-Si alloy in the air makes a porous and oxide inclusive deposit, even with use of pure argon plasma jet. It may be seen that some of these defects were caused by the oxidation of droplets in spraying. Air contamination into the plasma flame up to 90% was detected in the quantitative gas analysis of plasma flame at a distance of 90 mm from the torch.<BR>Spraying in argon atmosphere gave a somewhat better coated layer compared with the spraying in the air, but is far from being perfect. These results suggest that the protection of particle and substrate from oxidation is necessary but is insufficient for obtaining perfect coating. Furthermore, thermal problems in a process should be considered at the same time. As the result of atmospheric, thermal and kinetic considerations in the processes, shield spraying method has been proposed.<BR>In the shielded spraying of this alloy, the preheating of substrate has great effect on the bond between the coated layer and the substrate. For the specimen which is shield-sprayed without any preheating, a little amount of porosity was observed at the boundary. But almost perfect metallurgical bonding is accomplished with local preheating (300°C) of substrate surface.<BR>As for the application of shield nozzle, a series of experiments were carried out to analize the effect of nozzle. Results as follows;<BR>(1) Spraying atmosphere is kept perfectly inert.<BR>(2) Shield nozzle has an effect of raising the heat transfer from the plasma flame to the particles and substrate, since the contamination of cold gas is completely shout off.<BR>(3) Application of shield nozzle makes it easy to preheat the substrate surface with a high effluent of heat flux.<BR>(4) Temperature and velocity of particle rise as a result of increase of thermal efficiency and velocity of plasma flame.