Development of High-Heat Resistant Materials for Aerospace Use by Means of Gas Tunnel Type Plasma Reactive Spraying

气体隧道式等离子反应喷涂航空航天用高耐热材料的开发

• 批准号: 15360449
• 负责人: KOBAYASHI Akira
• 金额: $ 9.54万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360449/
• 关键词: TiN coating; Gas tunnel type plasma jet; Plasma reactive spraying; High hardness; Graded functionality; Thermal barrier coating; ZrO_2-Al_2O_3 composite coating; Porosity; プラズマ反応容射; ガストンネル型プラズマジェット

The results obtained by this study are as follows :1) The titanium nitride (TiN) coatings of 150μm thickness were obtained at P=25kW, t=5s in a short time operation, by means of the gas tunnel type plasma reactive spraying. Some coating characteristics which depend on the traverse number, powder feed rate, the environmental gas, etc. were clarified and the optimum condition was decided.2) The hardness of TiN coating was uniform in the cross section and the porosity was decreased with increase in the traverse number. The adhesion strength of TiN coating was about 14 MPa, and was decreased as the thickness was increased. As the results, 100μm thickness coating had better mechanical properties such as wear resistance.3) The TiN ratio of the obtained TiN coating was more than 95%, and was increased with increased in the mixing ratio of N_2 gas. After heat treatment the property of the TiN coating was improved without oxidation.4) High hardness zirconia (ZrO_2-Al_2O_3) composite coating formed by gas tunnel type plasma spraying had a graded functionality of hardness. With increase in Al_2O_3 mixing ratio, the graded functionality ZrO_2-Al_2O_3 composite coating was enhanced and dense coating was obtained. The combination of high hardness of Al_2O_3 with the low thermal conductivity of ZrO_2 will contribute the development of high functionally graded TBC (thermal barrier coating).5) The plasma temperature was 8000K at the torch exit, and the sprayed particle velocity was 150m/s, which were increased with increase in the plasma input power.6) This study proved that these coatings was available as High-Heat Resistant Materials for Aerospace Use, by using of gas tunnel type plasma spraying and/or reactive spraying method.

本研究得到的结果如下：1)采用气体隧道式等离子反应喷涂方法，在P=25kW、t=5s的条件下，在短时间内获得了厚度为150μm的氮化钛(TiN)涂层。明确了取决于往返次数、送粉量、环境气体等的涂层特性，并确定了最佳条件。2）TiN涂层断面硬度均匀，孔隙率随着行程次数的增加而减小，TiN涂层的附着强度约为14 MPa，并且随着厚度的增加而降低。结果表明，100μm厚度的涂层具有更好的耐磨性等力学性能。所得TiN涂层的氧化率均在95%以上，且随着N_2气体混合比例的增加而提高，热处理后TiN涂层的性能得到改善，且不发生氧化。4)高。气体隧道式等离子喷涂形成的氧化锆(ZrO_2-Al_2O_3)复合涂层具有梯度功能性,随着Al_2O_3混合比例的增加,ZrO_2-Al_2O_3复合涂层的梯度功能性增强,涂层结合致密。 Al_2O_3的硬度和ZrO_2的低导热率将有助于高功能梯度TBC（热障涂层）的发展5) 火炬出口处的等离子体温度为 8000K，喷涂粒子速度为 150m/s，随着等离子体输入功率的增加而增加。6) 本研究证明这些涂层可用作高耐热涂层。航空航天用耐磨材料，采用气体隧道式等离子喷涂和/或反应喷涂方法。

项目成果

イットリア安定化ジルコニア溶射膜の微細構造と変形挙動の関係

氧化钇稳定氧化锆喷涂层微观结构与变形行为的关系

• 发表时间: 2005
• 作者: 脇 裕之

Low Temperature DBD Plasma Jet and Controlled Smart Plasma Torch

低温DBD等离子射流和受控智能等离子炬

• 发表时间: 2005
• 作者: Jialiang ZHANG; Akira KOBAYASHI
• 通讯作者: Akira KOBAYASHI

Performance of Zirconia Composite Coatings Produced by Gas Tunnle Type Plasma Spraying as a Thermal Barier Coatings

气体隧道式等离子喷涂氧化锆复合涂层作为热障涂层的性能

• 发表时间: 2003
• 作者: Akira Kobayashi

Experimental Facility for Thermal Cycle Testing of Refractory Foams Using Plasma Technology

利用等离子体技术进行耐火泡沫热循环测试的实验装置

• 发表时间: 2003
• 作者: Shahram SHARAFAT; A.KOBAYASHI; Nasr M.GHONIEM
• 通讯作者: Nasr M.GHONIEM

Akira Kobayashi, Shahram Sharafat, a Nasr M.Ghoniem: "Deposition of Tungsten on Stainless Steel by Gas Tunnel Type Plasma Spraying Torch"ADVANCES IN APPLIED PLASMA SCIENCE. Vol.4. 387-394 (2003)

Akira Kobayashi、Shahram Sharafat、Nasr M.Ghoniem：“通过气体隧道型等离子喷涂炬在不锈钢上沉积钨”应用等离子体科学的进展。