Method for producing aluminum magnesium titanate sintered product

• US 7,166,552 B2
• Filed: 10/09/2003
• Issued: 01/23/2007
• Est. Priority Date: 11/01/2002
• Status: Expired

• Current Assignee: OHCERA Co. Ltd.
• Original Assignee: OHCERA Co. Ltd.
• Inventors: Fukuda, Masahiro, Takahashi, Masahide, Fukuda, Masaaki, Fukuda, Tsutomu, Yoko, Toshinobu
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US10/530,476
• Publication Number:
  US 20060009347A1
• Time in Patent Office: 1,202 Days
• Field of Search: 501/118, 501/119, 501/127, 501/128, 501/134, 501/135, 501/136, 264/658, 264/674, 264/681
• US Class Current: 501/136
• CPC Class Codes: C04B 2235/3206 Magnesium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3222 Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
• CPC Class Codes: C04B 2235/3231 Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3232 Titanium oxides or titanates, e.g. rutile or anatase
• 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 2235/6562 Heating rate
• CPC Class Codes: C04B 2235/80 Phases present in the sintered or melt-cast ceramic products other than the main phase
• 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 35/465 based on alkaline earth metal titanates
• CPC Class Codes: C04B 35/478 based on aluminium titanates
• CPC Class Codes: C04B 35/638 Removal thereof

Abstract

The present invention provides a process for preparing a sintered body comprising as a basic component aluminum magnesium titanate represented by the composition formula: Mg_xAl_2(1−x)Ti_(1+x)O₅ wherein the value of x is 0.1≦x<1. The process comprises a step of sintering a formed product from a raw material mixture comprising 100 parts by weight, calculated on an oxide basis, of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound at the same metal component ratio as the metal component ratio of Mg, Al and Ti in the above composition formula, and 1–10 parts by weight of an alkali feldspar represented by the composition formula: (Na_yK_1−y)AlSi₃O₈ wherein the value of y is 0≦y≦1.

According to the process of the present invention, a sintered body of aluminum magnesium titanate having stability in continuous use at high temperatures and excellent mechanical strength, while maintaining inherently low thermal expansibility of a sintered body of aluminum magnesium titanate, can be obtained.

Claims

1. A process for producing a sintered body comprising as a basic component aluminum magnesium titanate represented by the composition formula:

Mg_xAl<sub>2(1−

x)</sub>Ti_(1+x)O₅

wherein the value of x is 0.1≦

x<

1,

the process comprising a step of sintering a formed product from a raw material mixture comprising the ingredients (i) and (ii) below;

(i) 100 parts by weight, calculated on an oxide basis, of a mixture comprising a Mg-containing compound, an Al-containing compound and a Ti-containing compound at the same metal component ratio as the metal component ratio of Mg, Al and Ti in the composition formula,

(ii) 1–

10 parts by weight of an alkali feldspar represented by the composition formula;

(Na_yK<sub>1−

y</sub>)AlSi₃O₈

wherein the value of y is 0≦

y≦

1.

2. A process of producing a sintered body of aluminum magnesium titanate according to claim 1, wherein the value of x in the composition formula:

Mg_xAl<sub>2(1−

x)</sub>Ti_(1+x)O₅ is 0.25≦

x≦

0.75.

3. A process of producing a sintered body of aluminum magnesium titanate according to claim 1, wherein the value of y in the composition formula:

(Na_yK<sub>1−

y</sub>)AlSi₃O₈ is 0.15≦

y≦

0.85.

4. A process of producing a sintered body of aluminum magnesium titanate according to claim 1, wherein a sintering temperature is 1000–

1700°

C.

5. A sintered body of aluminum magnesium titanate which is obtainable by the process of claim 1.