| 摘要 |
A method of production of poly-crystalline diamond powder, wherein a hydro-carbon gas is passed through the arc zone (28) of a plasma gun (13), the arc zone being at a temperature above 10000 K, plasma (27) is passed from the arc zone (28) having a temperature gradient from at least 5000 K to less than 1500 K, the plasma (27) is quenched by subjecting it to a flow of sufficient relatively cold gas to induce thermal shock, the temperature gradient of the plasma is increased, and its size reduced in turn increasing carbon density in the plasma and the value of carbon super saturation ratio, and in turn producing diamond powder substantially free of graphite. |
