DEVELOPMENT OF HIGH PERFORMANCE SILICON NITRIDE CERAMICS COATED WITH MULLITE

高性能莫来石涂层氮化硅陶瓷的研制

• 批准号: 05555237
• 负责人: HATTORI Makoto
• 金额: $ 4.67万
• 依托单位: YONAGO NATIONAL COLLEGE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555237/
• 关键词: CERAMICS; GRADIENT INTERFACE; SURFACE MODIFICATION; AUTOCLAVE; NON-OXIDE; CORROSION RESISTANCE; STRUCTURAL MATERIAL; COMPOSITE

It is well known that Si_3N_4 ceramics are readily susceptible to high-temperature oxidation and hydrothermal corrosion. Mullite and Si_3N_4 have very close coefficients of thermal expansion, suggesting a durable coating/substrate system can be made. In general, mullite shows better corrosion resistance to high-temperature oxidation and hydrothermal corrosion. The purpose of this project is to fabricate mullite coated Si_3N_4 ceramics and to characterize the oxide/nitride gradient nano-interface of the materials. Mullite coatings by using the hydrolysis of mixed alkoxides were applied to Si_3N_4 coupons and hydrothermally corroded Si_3N_4 coupons. The following resuls were obtained.1.X-ray diffraction indicated mullite powders to be a single phase, which were prepared by the hydrolysis of mixed alkoxides route and heated at above 900ﾟC.2.Mullite coatings on Si_3N_4 substrates can be successfully made by dipping in the mixed alkoxides solution. Coatings were approximately 30 to 80 mum thick on Si_3N_4 substrates after heating at 1300ﾟC.These materials have a oxide/nitride gradient interface at coating/substrate system.3.Coatings showed good adherence to the Si_3N_4 substrates, but poor density. Because of these features, the fracture strength and vickers hardness were relatively low compared to Si_3N_4 ceramics.

众所周知，SI_3N_4陶瓷很容易敏感，并且可以使热腐蚀的粘合剂的近距离腐蚀。材料和水热腐蚀的SI_3N_4优惠券。涂料在Si_3n_4的底部厚度约30厚，船尾在船尾后尾后的船尾在1300°的船尾加热。这些材料在涂层/底物系统上具有氧化物/氮化物梯度界面。3.Coatings对SI_3N_4 sistraterates coattions coating/disstrate system。 ，由于theatures，裂缝强度和W与Si_3n_4陶瓷相匹配。

项目成果

小田耕平: "Hydrothermal Corrosion of Pure,Hot Isostatically Pressed Silicon Nitride" J. Am, Ceram, Soc.176. 1365-68 (1993)

Kohei Oda：“纯热等静压氮化硅的水热腐蚀”J. Am，Ceram，Soc.176（1993）。

KOHEI ODA: "OXIDATION KINETICS of HEXAGONAL BORON NITRIDE POWDER" J.Mater.Sci.28-24. 6562-66 (1993)

Kohei Oda：“六方氮化硼粉末的氧化动力学”J.Mater.Sci.28-24。

KOHEI ODA: "HYDROTHERMAL CORROSION of MULLITE POWDER" J.Mater.Sci.Lett.13-20. 1454-56 (1994)

Kohei Oda：“莫来石粉的水热腐蚀”J.Mater.Sci.Lett.13-20。

KOHEI ODA: "HYDROTHERMAL CORROSION of PURE,HOT ISOSTATICALLY PRESSED SILICON NITRIDE" J.Am.Ceram.Soc.76-5. 1365-68 (1993)

Kohei Oda：“纯热等静压氮化硅的水热腐蚀”J.Am.Ceram.Soc.76-5。

小田耕平: "Oxidation Kinetics of Hexagonal Boron Nitride Powder" J. Mater. Sci.28. 6562-66 (1993)

Kohei Oda：“六方氮化硼粉末的氧化动力学”J. Mater. 6562-66 (1993)。