| 摘要 |
Cubic boron nitride is refined from a mixture of cubic boron nitride and hexagonal boron nitride by adding to the mixture lithium hydroxide, sodium hydroxide, or potassium hydroxide, or mixtures thereof and water as may be necessary to control the hydroxide fusion temperature, heating to a low-temperature molten state to dissolve the hexagonal boron nitride, and separating the cubic boron nitride from the remainder of the mixture. |
