著者

乾 一代 大西 宏司 河波 利夫

出版者

The Society of Powder Technology, Japan

雑誌

粉体工学会誌 (ISSN:03866157)

巻号頁・発行日

vol.30, no.2, pp.80-87, 1993

被引用文献数

3

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The wear characteristics of ZrO₂ balls, which were prepared under several conditions, were investigated.<br>The wear loss of ZrO₂ balls was attributed to the materials of the tank, such as Al₂O₃, ZrO₂, and urethane. The wear loss of ZrO₂ balls using a mill with an Al₂O₃ lining was larger than that using a mill with ZrO₂ or urethane. This result indicated that the wear particles of the Al₂O₃ lining worn by ZrO₂ balls attacked the surface of the ZrO₂ balls and promoted the wear of the balls, because Al₂O₃ particles are harder than ZrO₂ balls.<br>Also, the wear loss of the ZrO₂ balls depended mainly on the grain size, fracture toughness and strength of the balls.<br>The SEM of the worn surface showed some defects and pores, and the wear mode was primarily intergranular.<br>It was supposed that phase transformation also had an influence on the wear of the balls.

著者

河波 利夫

出版者

Japan Society of Powder and Powder Metallurgy

雑誌

粉体および粉末冶金 (ISSN:05328799)

巻号頁・発行日

vol.39, no.12, pp.1060-1066, 1992

被引用文献数

2 2

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Development of toughened zirconia parts for grinding was reviewed. This work was achieved by developing the high purity, ultra-fine zirconia powder processing and toughened Y-TZP( Y<SUB>2</SUB>O<SUB>3</SUB> doped tetragonal ZrO<SUB>2</SUB> ceramics ), and investigating the propertieswear characteristics relation. Zirconia powders prepared by the hydrolysis method, which was the lowest production cost, showed the good formability and sinterbility. Y-TZPP containing 2.5-3.0mol% Y<SUB>2</SUB>O<SUB>3</SUB> gave higher fracture toughness and strength by the stress induced phase transformation toughening. The wear characteristics of Y-TZP grinding media depended strongly on the fracture toughness, strength and grain size, but not on hardness and density within the range of this experiment. It is considered that the excellent wear characteristic zirconia parts for grinding can be obtained by controlling the fracture toughness, strength and microstructure. To investigate these mechanism, the microstructures of worn areas were examined by SEM observations.