Process for preparing sintered body of aluminum titanate

• US 6,403,019 B1
• Filed: 11/06/2000
• Issued: 06/11/2002
• Est. Priority Date: 11/08/1999
• Status: Expired due to Fees

• Current Assignee: OHCERA Co. Ltd.
• Original Assignee: Masaaki Fukuda, Masahiro Fukuda, Tsutomu Fukuda
• Inventors: Fukuda, Masahiro, Fukuda, Masaaki, Fukuda, Tsutomu
• Primary Examiner(s): DERRINGTON, JAMES H
• Application Number:
  US09/705,753
• Time in Patent Office: 582 Days
• Field of Search: 501/127, 423/598, 241/15, 241/16, 264/658, 264/661, 264/681
• US Class Current: 264/658
• CPC Class Codes: C04B 35/478 based on aluminium titanates

Abstract

The present invention provides a process for preparing a raw material powder for producing a sintered body of aluminum titanate comprising:

pulverizing a mixture containing:

(1) 100 parts by weight of aluminum titanate crystals pulverized until a maximum grain size of 30 to 50 μm is attained; and

(2) 2 to 6 parts by weight of spinel crystals obtained by heating a mixture containing MgO and Al₂O₃ at 1250° C. to 1290° a molar ratio of MgO to Al₂O₃ being 1:0.95 to 1:1.05,

said pulverizing being conducted by wet grinding process with a ball mill or cylinder mill.

Claims

1. A process for preparing a raw material powder for producing a sintered body of aluminum titanate comprising:

pulverizing a mixture containing;

(1) 100 parts by weight of aluminum titanate crystals pulverized until a maximum grain size of 30 to 50 μ

m is attained; and

(2) 2 to 6 parts by weight of spinel crystals obtained by heating a mixture containing MgO and Al₂O₃ at 1250°

C. to 1290°

C., a molar ratio of MgO to Al₂O₃ being 1;

0.95 to 1;

1.05,

said pulverizing being conducted by wet grinding process with a ball mill or cylinder mill.

2. The process for preparing the raw material powder according to claim 1, wherein the mixture containing aluminum titanate crystals and spinel crystals is pulverized until the maximum grain size of aluminum titanate crystals becomes 3 μ

m or smaller.

3. The process for preparing the raw material powder according to claim 1, wherein the aluminum titanate crystals are prepared by heating a mixture of titanium oxide in anatase form with γ

-alumina and the spinel crystals are prepared by heating γ

-alumina and soft-burned magnesia.

4. A process for preparing a sintered body of aluminum titanate, the process comprising the steps of forming the raw material powder obtained by the process according to claim 1 into a desired shape;

and sintering the formed product.

5. The process for preparing the sintered body of aluminum titanate according to claim 4, wherein sintering is conducted at 1600°

C. to 1700°

C. and then cooling to 1200°

C. is conducted at a cooling rate of 280°

C./hour or higher.