Title:
ALUMINOUS SINTERED COMPACT AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3279885
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an aluminous sintered compact excellent in strength and fracture toughness by allowing specified isotropic Al2O3 crystalline grains to coexist with specified anisotropic Al2O3 crystal grains.
SOLUTION: This aluminous sintered compact contains 15-80vol.% isotropic Al2O3 crystal grains each having ≤3μm major axis size and an aspect ratio of ≤1.5 and 20-85vol.% anisotropic Al2O3 crystal grains each having ≥10μm major axis size and an aspect ratio of ≥3. It is obtd. by adding a metal oxide forming a eutectic with Al2O3 at ≤1,600°C to Al2O3 powder, mixing and compacting them and firing the resultant compact by heating from room temp. to the firing temp. at ≥8°C/min rate. The metal oxide is one or more of oxides selected from Na, Mg, Ca, Sr, Ba, Ti, Fe, Mn, W, Si and group IIIa elements. The firing temp. is between a liq. phase formation temp. and 1,700°C, preferably 1,200-1,700°C. Microwaves are effectively used as a means of heating the compact and the output is preferably ≥5kW.
Inventors:
king rain
Hiroshi Maruyama
Hiroshi Maruyama
Application Number:
JP25073595A
Publication Date:
April 30, 2002
Filing Date:
September 28, 1995
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
C04B35/10; (IPC1-7): C04B35/10
Domestic Patent References:
| JP61256963A | ||||
| JP6157133A | ||||
| JP8259926A |