Silicon nitride composite refractories
AssigneeKyushu Refractories Co., Ltd.
InventorsAkira Watanabe, Yoshimitsu Takeuchi, Noboru Shinoda, Tetsusaburo Isono, Kenji Fujiwara
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Abstract
The present invention relates to silicon nitride composite refractories having silicon nitride bonds therein and having an increased thermal shock-resistance, an improved molten steel-resistance and an improved mechanical strength, which consists of silicon nitride at 20 to 60 wt %, refractory materials at 10 to 50 wt % and boron nitirde at 1 to 30 wt %, or additionally carbon fibers of 0.5 to 10 wt %. The above described characteristics can be realized because the silicon nitride bonds are bonding structures.
Claims7
Silicon nitride composite refractories consisting of:
- 20 to 60 wt% silicon nitride;
- 10to 50 wt% refractory materials in powder form selected from the group consisting of magnesia, spinel, alumina, zirconia and carbides, said refractory materials having grain sizes of 50 microns or more, and
- 1 to 30 wt% boron nitride,
- said composite refractories containing silicon nitride bonds formed by the reaction sintering of silicon, said silicon nitride bonds being bonded structures.
Silicon nitride composite refractories consisting of:
- 20 to 60 wt% silicon nitride;
- 10 to 50 wt% refractory materials in powder form selected from the group consisting of magnesia, spinel, alumina, zirconia and carbides, said refractory materials having grain sizes of 50 microns or more, and
- 1 to 30 wt% of boron nitride, carbonaceous materials or both, said carbonaceous materials being selected from the group consisting of graphite, coke and carbon black,
- said composite refractories containing silicon nitride bonds formed by the reaction sintering of silicon, said silicon nitride bonds being bonded structures.
Dependencies are inferred from the claim text.