Φ42 mm腔体高岭石-白云石质传压密封介质金刚石合成扩大试验

 高岭石具有良好的流动密封、固体传压及机械加工等物理性能，是传统传压密封介质原料叶蜡石的替代品。采用比纯高岭石更适合作为传压密封介质原料的某地高岭石矿物，经过配料、混料、装模、压制成型以及焙烧等工序，制成了高岭石-白云石质传压密封介质，并对其进行金刚石合成扩大试验。试验结果表明：高岭石-白云石质传压密封介质能够达到与叶蜡石质传压密封介质相当的效果；合成金刚石的单产为19 g，抗压强度不小于160 N的晶粒占32%，晶粒尺寸大于或等于0.30 mm的占82%，合成1 g金刚石的顶锤消耗小于0.5 g，合成过程稳定。

Enlarged Scale Tests on Diamond Synthesis by Pressure Transmitting and Sealing Medium with Inside Diameter of 42 mm and Composed of Kaolinite and Dolomite

Kaolinite can take the place of pyrophyllite in the use of pressure transmitting and sealing medium due to its good sealing performance, pressure transmitting property and machining capability. The selected kaolinite sample in this paper is not pure mineral, but it is more suitable for the pressure transmitting and sealing. A new pressure transmitting and sealing medium composed of kaolinite and dolomite is obtained through batching, mixing, shaping, and roasting. With this pressure transmitting and sealing medium, a large number of diamond synthesis tests are conducted. The test results show that the per unit yield of diamond is 19 g, the proportions of crystals whose compression strength and grain size are more than 160 N and 0.30 mm are 32% and 82%, respectively, and the cemented carbide anvil consumption is less than 0.5 g per 1 g of the produced diamond. In addition, the synthesis process observed is stable. Compared with pyrophyllite, the selected kaolinite-dolomite can also achieve considerable effect.