Method for producing aluminum titanate sintered object

• US 7,011,788 B2
• Filed: 11/06/2001
• Issued: 03/14/2006
• Est. Priority Date: 11/08/2000
• Status: Expired

• Current Assignee: OHCERA Co. Ltd.
• Original Assignee: OHCERA Co. Ltd.
• Inventors: Fukuda, Masahiro, Fukuda, Masaaki, Fukuda, Tsutomu
• Primary Examiner(s): Vincent, Sean
• Assistant Examiner(s): LYLES IRVING, CARMEN V
• Application Number:
  US10/169,728
• Publication Number:
  US 20030015829A1
• Time in Patent Office: 1,589 Days
• Field of Search: 423/598, 264/674, 264/681, 264/658, 501/127
• US Class Current: 264/674
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3472 Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
• CPC Class Codes: C04B 2235/5445 submicron sized, i.e. from 0,1 to 1 micron
• CPC Class Codes: C04B 2235/604 Pressing at temperatures other than sintering temperatures
• CPC Class Codes: C04B 2235/652 Reduction treatment C04B2235/664 takes precedence
• CPC Class Codes: C04B 2235/6562 Heating rate
• CPC Class Codes: C04B 2235/661 Multi-step sintering
• CPC Class Codes: C04B 2235/761 Unit-cell parameters, e.g. lattice constants
• CPC Class Codes: C04B 2235/77 Density
• CPC Class Codes: C04B 2235/96 Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
• CPC Class Codes: C04B 2235/9607 Thermal properties, e.g. thermal expansion coefficient
• CPC Class Codes: C04B 2235/9615 Linear firing shrinkage
• CPC Class Codes: C04B 35/478 based on aluminium titanates
• CPC Class Codes: C04B 35/62655 Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
• CPC Class Codes: C04B 35/63 using additives specially adapted for forming the products , e.g.. binder binders
• CPC Class Codes: C04B 35/64 Burning or sintering processes C04B33/32 takes precedence ; powder metallurgy B22F

Abstract

The present invention provides a process for preparing an aluminum-titanate-based sintered body comprising the step of firing, at 1250 to 1700° C., a formed product prepared from a raw material mixture containing 100 parts by weight of a mixture of TiO₂ and Al₂O₃ in a weight ratio of TiO₂:Al₂O₃=40:60 to 60:40, and 1 to 15 parts by weight of an alkali feldspar represented by the formula:(Na_xK_1-x)AlSi₃O₈ wherein 0≦x≦1.

According to the process of the present invention, it is possible to obtain an aluminum-titanate-based sintered body in which inherent properties of an aluminum titanate, i.e., a low coefficient of thermal expansion and high corrosion resistance are maintained, the mechanical strength thereof is improved, and which can be stably used even under high temperature conditions.

Claims

1. A process for preparing an aluminum-titanate-based sintered body comprising the step of firing a formed product at 1250 to 1700°

C.,

the formed product being prepared from a raw material mixture containing;

100 parts by weight of a mixture containing TiO₂ and Al₂O₃ in a weight ratio of TiO₂;

Al₂O₃=40;

60 to 60;

40, and

1 to 15 parts by weight of an alkali feldspar represented by the formula;

(Na_xK_1-x)AlSi₃O₈ wherein 0≦

x≦

1.

2. The process for preparing an aluminum-titanate-based sintered body according to claim 1, wherein the formed product is fired under a reducing atmosphere.

3. The process for preparing an aluminum-titanate-based sintered body according to claim 1 or 2, wherein x in the formula:

(Na_xK_1-x)AlSi₃O₈ is 0.1≦

x≦

1.