生产环境恒温对培育钻石生长质量的影响

Effect of constant temperature production environment on cultivated diamond growth quality

在1300℃~1350℃范围、5.6 GPa条件下使用国产六面顶压机设备,通过温度梯度法,控制合成车间温度变化幅度在±2℃之内,合成培育钻石。实验结果表明,控制车间温度恒温到25℃±2℃附近,相对于未控制车间温度时,合成培育钻石中包裹体夹杂物比例明显减少,优晶比例提高,培育钻石单产提高3.4%,且批次单块稳定性提高,生长速度相对稳定;两者所得的培育钻石晶型、高径比几乎一致。并对两种车间控温模式下合成出的培育钻石进行拉曼光谱检测,测试结果表明,两组培育钻石的拉曼峰值非常接近,金刚石的本位特征峰1332.5 cm^(-1),恒温下合成的培育钻石的拉曼半高宽数值小于未控制车间温度下合成出的培育钻石的拉曼半高宽,结晶程度相对更好。

In the temperature range of 1300℃~1350℃and under the pressure condition of 5.6GPa,the domestic cubic press equipment is used to control the temperature change range of synthesis workshop within 2℃through the temperature gradient method,and the diamond is synthesized and cultivated.The experimental result shows that when the workshop temperature is controlled to be around 25℃±2℃,compared with that condition when the workshop temperature is not controlled,the proportion of inclusions in synthetic cultivated diamonds is obviously reduced,the proportion of excellent crystals is increased,the yield of cultivated diamonds is increased by 3.4%,and the stability of single batch is improved and the growth rate is relatively stable.The crystal form and height-diameter ratio of the cultivated diamonds obtained by the two methods are almost the same.The cultivated diamonds synthesized in two workshop temperature control modes are tested by Raman spectroscopy.The test result shows that the Raman peaks of the two groups of cultivated diamonds are very close to the standard characteristic peak of diamond,which is 1332.5 cm^(-1).The Raman FWHM value of cultivated diamonds synthesized at constant temperature is smaller than that of cultivated diamonds synthesized at uncontrolled workshop temperature,and the degree of crystallization is relatively better.