Process for producing an aluminum nitride sintered product

Details Process for producing an aluminum nitride sintered product Process for producing an aluminum nitride sintered product

1993-07-12

1994-07-19

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 98, C04B 3558

Patent

active

053306929

ABSTRACT:
An aluminum nitride (AlN) sintered product with a high thermal conductivity of 120 W/m.multidot.k or above can be produced at a relatively low sintering temperature of 1650.degree. C. or below in accordance with the following process of the present invention. That is, an A1N powder having a specific surface in a region of about 3.5 to 8 m.sup.2 /g and an oxygen content between 0.5 to 1.8 wt % is mixed with optimum additive amounts of sintering aids (I) to (III) to obtain a mixture powder. The sintering aid (I) is at least one selected from the group consisting of rare earth oxides and rare earth compounds which are converted to corresponding rare earth oxides by the sintering. The sintering aid (II) is at least one selected from the group consisting of alkaline earth oxides and alkaline earth compounds which are converted to corresponding alkaline earth oxides by the sintering. The sintering aid (III) is at least one selected from the group consisting of LAB.sub.6, NbC, and WB. The optimum additive amount of LaB.sub.6 is in a range of 0.05 to 3 wt % of the A1N sintered product. The mixture powder is compacted, and then sintered at the sintering temperature in a non-oxidation atmosphere to obtain the A1N sintered product.

REFERENCES:
patent: 4711861 (1987-12-01), Sawamura
patent: 4746637 (1988-05-01), Kasori et al.
patent: 4877760 (1989-10-01), Okuno et al.
patent: 5219803 (1993-06-01), Yamakawa et al.

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