Claims
- 1. A method for producing a sintered body of aluminum nitride which comprises steps of:
- mixing alumina powder having a purity of not lower than 99.0% and an average particle size of not larger than 2 .mu.m with 10 to 100 parts by weight of carbon or a compound which liberates carbon by heating in terms of carbon per 100 parts by weight of alumina,
- molding the mixture and
- sintering the molded mixture at a temperature of 1,600 to 2,200 .degree. C. in an atmosphere containing nitrogen to produce the sintered body of aluminum nitride which has an average particle size of not larger than 5 .mu.m.
- 2. The method according to claim 1, wherein the amount of the carbon or the compound which liberates carbon by heating is from 20 to 100 parts by weight per 100 parts by weight of alumina.
- 3. The method according to claim 1, wherein alumina is further mixed with 0.01 to 50 parts by weight of at least one additive selected from the group consisting of aluminum nitride powder, aluminum powder, compounds of the IIa and IIIa elements of the Periodic Table in terms of their oxide per 100 parts by weight of alumina.
- 4. The method according to claim 3, wherein the amount of said additive is from 0.1 to 50 parts by weight per 100 parts by weight of alumina.
- 5. A method for producing a sintered body of aluminum nitride comprising steps of:
- molding aluminum powder having a purity of not lower than 99.0% and an average particle size of not larger than 50 .mu.m and
- sintering the molded aluminum powder at a temperature of 1,600 to 2,200.degree. C. in an atmosphere containing nitrogen to produce the sintered body of aluminum nitride which has an average particle size of not larger than 5 .mu.m.
Priority Claims (8)
Number |
Date |
Country |
Kind |
62-212939 |
Aug 1987 |
JPX |
|
62-212940 |
Aug 1987 |
JPX |
|
62-212941 |
Aug 1987 |
JPX |
|
62-212942 |
Aug 1987 |
JPX |
|
62-212943 |
Aug 1987 |
JPX |
|
62-212944 |
Aug 1987 |
JPX |
|
62-212945 |
Aug 1987 |
JPX |
|
62-216431 |
Sep 1987 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/236,942, filed on Aug. 26, 1988, which was abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0181849 |
May 1986 |
EPX |
3333406 |
Mar 1984 |
DEX |
3541398 |
Jun 1986 |
DEX |
2052180 |
Aug 1985 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
236942 |
Aug 1988 |
|