| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.23 ( October 1990 ) R&D of High-Technology Research Laboratories, Commemorating the 20th Anniversary of the Technical Research Division ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Machinable Si3N4-BN Composite Ceramics Keiichiro Isomura, Toshihiko Funahashi, Ryoji Uchimura |
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Synopsis : Advanced composite ceramics of the Si3N4-BN system have been developed. The Si3N4-BN composite ceramics (SNB) have been produced using slipcasting technique, which utilizes homogeneous mixing of ultra-fine constituent ceramic powders, and N2 gas pressure sintering. An essential feature of SNB is that it is possible to change widely their various properties by controlling the proportion of BN to Si3N4. The advantageous features of SNB are high thermal shock resistance, high corrosion resistance to molten metal, and excellent machinablity while retaining relatively high strength, i.e., the bending strength of SNB with 20 wt.% BN is 200 MPa or over. The thermal shock resistance temperature is improved by 250 to 300 compared with Si3N4 monolithic ceramics by incorporating 20 wt.% BN. These features indicate that SNB are well suited to machine parts for various molten metal casting facilities and jigs for heat treatment. |
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