High-Functionally Graded Materials by Plasma Process

在1999-2001财政年度期间，促进了题为：等离子体处理高功能梯度材料(HFGM)的联合研究，以形成高功能梯度材料，并通过高能处理提高这些材料的性能。日本方面和美国方面的主要研究人员相互访问，并在实验和理论研究方面进行了合作。本课题三年来取得的研究成果如下：1.在大阪大学利用气道式等离子喷涂技术制备了功能梯度氧化锆涂层、氧化锆/氧化铝复合涂层和碳化钨复合涂层。研究了这些涂层的组织和性能，明确了密度、硬度等梯度功能。对所得到的HFGM的微观结构和功能进行了表征。一个例子是氧化锆、氧化铝复合涂层。Bo…的实验结果更多的方面将进行比较和讨论。此外，还将促进高能等离子体等方法获得的HFGM的功能性增强。促进了功能梯度材料等离子喷涂新工艺的研究，并利用气道式等离子反应喷涂技术制备了TiN厚涂层。阐明了这些涂层的组织结构和硬度、TiN含量等物理性能。该方法被确立为生产HFGM.4的新工艺。日方到访加州大学洛杉矶分校，推动双方就气道式等离子喷涂功能梯度氧化锆涂层、氧化锆/氧化铝复合涂层、碳化钨复合涂层的实验研究开展合作。采用气道式等离子喷涂的热处理工艺，实现了氧化锆复合涂层的梯度功能增强，并对涂层的梯度功能进行了讨论。对氧化锆/氧化铝复合涂层进行了理论研究，阐明了涂层的热力学性质。利用传热学模型计算了复合涂层的热阻。这些研究成果已在ISAPS‘99、’01和1999-2001年度研究会议上公布。

The Joint Research entitled: High-Functionally Graded Materials (HFGM) by Plasma Process, had been promoted during the fiscal year 1999-2001, in order to form high-functionally graded materials and to enhance the performance of those materials by high energy processing. Main researchers of both Japan side and USA side had been visited each other, and collaborated on the experimental and theoretical investigations. The research results of this project obtained in these three years were as follows:1. Functionally Graded Zirconia Coatings, Zirconia/Alumina Composite Coatings and WC Composite Coatings have been formed by the gas tunnel type plasma spraying at Osaka University. The microstructure and properties of these coatings were investigated, and the graded functionality of density, hardness, etc. were clarified2. The characterization of the microstructure and the functionality of obtained HFGM. One example is zirconia, alumina composite coating. The experimental results obtained by bo … More th sides will be compared and discussed. And moreover, it will be promoted to enhance the functionality of obtained HFGM by high-energy plasma etc.3. The studies on the new plasma spraying process for FGM were promoted and TiN thick coating was produced by means of the gas tunnel type plasma reactive spraying. The microstructure and physical properties such as hardness, TiN ratio etc. of these coatings were clarified. This method was established as the new process for producing HFGM.4. Japan side visited UCLA and promoted the collaboration about experimental study on Functionally Graded Zirconia Coatings, Zirconia/Alumina Composite Coatings and WC Composite Coatings formed by the gas tunnel type plasma spraying. And the enhancement of the Graded Functionality of those Zirconia Composite Coatings was achieved by the thermal process using the gas tunnel type plasma spraying and discussed about the graded functionality of those coatings.5. The theoretical study on the Zirconia/Alumina Composite Coatings was investigated and the thermo-dynamical properties of those coatings were clarified. The heat resistance of the composite coating was calculated by using the heat transfer model.6. Those research results obtained were presented at the ISAPS '99, '01, and the Research Meeting 1999-2001. Less