| 摘要 |
<p>A porous refractory material with a porosity of 25-70 per cent by volume and with 99.7 per cent of open pores, obtained by compression of an exothermic mixture comprising at least one metal from Groups IV to VI and VIII of the periodic system and at least one non-metal: boron, carbon, silicon, with subsequent thermo-vacuum treatment of the mixture at a temperature of 300-700°C, bringing the temperature to 200-1050°C and, finally, initiating the burning of that mixture in the vacuum. To make an article of said material a blank is formed, the density of which corresponds to that of the future article and which is treated in a similar manner. Articles of a complex form are obtained from blanks (1) assembled together with cover-pieces (2) formed of a mixture having the same composition.</p> |
