| 摘要 |
<p>Refractory materials having a high resistance to corrosion, a high temperature mechanical resistance and a resistance to thermic shock, comprising: (a) grains of at least one refractory material whose fusion point or point of possible thermic dissociation is above 1700 °C, said grains being dispersed in (b) a bonding matrix primarily consisting of a sialon of the formula Si6-zAlzOzN8-z where z is between 0.5 to 4, defined according to an X-radiation diffraction diagramme, characterized in that they further comprise: (c) hexagonal boron nitride particules and/or crystallized graphite dispersed in said bonding matrix. For use in the iron and steel industry, in particular as sliding valve seal plates, immersed nozzles and the like.</p> |
