Silicon nitride ceramic and a process for its preparation

Details Silicon nitride ceramic and a process for its preparation Silicon nitride ceramic and a process for its preparation

1990-02-16

1991-10-22

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 3558

Patent

active

050595652

ABSTRACT:
A multi-phase ceramic which is resistant to high temperatures and contains 25-85 % by weight of crystalline .beta.-silicon nitride, 11 to 70% by weight of crystalline cubic HfO.sub.2 and an amorphous glass phase which, in addition to silicon, contains at least one of the elements magnesium, yttrium and/or the rare earths and if appropriate aluminum, has good mechanical properties.
To prepare the ceramic, a mixture of 25-85% by weight of pulverulent a-silicon nitride, 11 to 70% by weight of monoclinic HfO.sub.2 and 5-20% by weight of at last one oxide of the elements magnesium, yttrium and/or the rare earths (from Sm to Yb) is shaped to a body and this is sintered to give a dense body at 1,700-2,000.degree. C.

REFERENCES:
patent: 4640902 (1987-02-01), Lange
patent: 4814301 (1989-03-01), Steinmann et al.
patent: 4830991 (1989-05-01), Matsui
patent: 4883776 (1989-11-01), Pyzik et al.
patent: 4902653 (1990-02-01), Komatsu et al.
patent: 4919689 (1990-04-01), Pyzik et al.
patent: 4920085 (1990-04-01), Yoshida et al.

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