| 摘要 |
<p>Boron nitride articles are made by heat treating turbostratic BN powder to reduce its oxygen content to 5-8 % (mesographitic BN), washing this heat-treated powder, mixing it with 5-8 % amorphous boron, shaping the mixture, explosively compacting the shape by a hydrodynamic method and reaction sintering the compacted shape, to form the article. The article is then buried in a powder mixture of BN and SiC and heat-treated, to getter residual B2O3. After this, the article is impregnated with low-viscosity oligomers (MW < 1000) of methylsilanes selected to yield a high proportion of SiC on pyrolysis, and the article is heat-treated to fill the pores evenly throughout its thickness with SiC.</p> |
