【摘要】 传统的直接加热式合成腔组装结构,存在两个问题:一是原材料本身通电发热,原料发生反应时电阻就会变化,加热功率也随之变化,造成温度波动,不利于金刚石生长;二是高压腔内各部位温度高低与压力高低不一致。间接加热式金刚石合成腔,原料本身不通电发热,由外部发热体发热,热量由外向内传导,间接使原料加热。压力与温度梯度方向一致,互相匹配,解决了高压腔各部位压力和温度高低互不匹配的难题;而且,在原料发生反应时,电阻不变,温度不会波动。实现了压力和温度的均匀、稳定,从而生产出高品级产品。单次合成金刚石500克拉以上,高品级率达到60%。更多还原

【Abstract】 There are two problems with the traditional direct-heating chamber structure.One is that the raw material itself is being electrified as well as giving out heat.The electrical resistance changes while the raw material reacts,so does the heating power.That directly results in the fluctuation of temperature,which is bad for the growth of diamond crystal.The other is the discrepancy of pressure and temperature inside the high-pressure chamber.Inside the indirect heating chamber,raw material itself is not being electrified nor giving out heat.Instead,heat is offered by some heater outside and transferred inside to heat the raw material indirectly.Gradient of pressure parallels to as well as matches with that of temperature,which solves the mismatch between these two elements inside the high-pressure chamber.Meanwhile,both electrical resistance and temperature remain unchanged when raw material reacts.What described above realizes uniformity and stability of pressure and temperature to produce high-quality product,per unit output reaches as much as and over 500cts,60% of which are of high grade.更多还原