Stress analysis and experiment on a split-type ultra-high-pressure die for synthesizing diamond

In order to obtain a higher pressure-bearing capacity and a larger sample volume and prolong the life of the high-pressure die, a novel high-pressure die for synthesizing gem-grade diamond is investigated with the finite element method. This device is the split-type die, and the cylinder is a combined type. Furthermore, this paper studies the stress distribution of the split-type cylinder and compares it with that of the traditional belt-type die. According to the simulation results, the split-type cylinder has much smaller stress than that of the belt-type cylinder, and it can bear much higher pressure. Meanwhile, the experimental tests also show that the high-pressure die with a split cylinder has a stronger pressure-bearing capacity than the belt-type die. Apart from that, the split-type cylinder has a better performance in easy manufacturing, strong pressure-bearing capacity, and replaceable performance.