Tosoh Corporation

Satoshi Kondoh

Koji Tsukuma

Hideto Kuramochi

Yoshinori Harada

Mutsumi Asano

Masahiro Watanabe

Tsukuma Koji

The subject of the present invention relates to obtaining a zirconia sintered body having excellent in both properties of a translucency and a mechanical strength. The present invention relates to obtaining a high-strength zirconia sintered body having a translucency of an in-line transmission of 50% or more at a sample thickness of 1 mm for visible light at a wavelength of 600 nm and an average flexural strength of 300 MPa or more by subjecting a zirconia primary sintered body having an average grain size of 1 &#x3bc;m or less and a relative density of 92% or more and the crystal phase composed of cubic crystals only to HIP treatment at a temperature of 1,250&#xb0; C. to 1,600&#xb0; C. and a pressure of at least 50 MPa. The primary sintered body is obtained by maintaining a molded body of a zirconia powder containing 7 mol % to 30 mol % of yttria at 1,100&#xb0; C. to 1,300&#xb0; C. for at least 5 hrs or by heating the molded body at a high rate of temperature rise of 500&#xb0; C./hr or more.

Transparent zirconia sintered body, method for producing same, and use of same

An abrasive molding comprising at least 90% by weight, based on the abrasive molding, of an inorganic material having a stock hardness of 50-400 kg/mm , and said abrasive molding having a relative density of 20-70% and an average particle diameter of 0.001-50 &mgr;m. The abrasive molding preferably has pores having a pore size distribution such that the integrated pore volume of pores having a diameter of 0.01-1 &mgr;m is at least 20% of the integrated total pore volume of the entire pores, and the integrated pore volume of pores having a diameter of 1-360 &mgr;m is in the range of 10% to 70% of the integrated total pore volume of the entire pores. The abrasive molding is suitable for polishing a material having a Vickers hardness not larger than 300 kg/mm .

Abrasive molding and abrasive disc provided with same

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Toyama, Japan

Satoshi Kondoh