金刚石高压合成腔体温场的有限元模拟

发布时间：2018-06-29 19:36

  本文选题：有限元模拟 + 温度降　； 参考：《长春理工大学》2015年硕士论文

【摘要】：本文利用有限元法对高压合成组装腔体内温度场进行了模拟。提出腔体组装设计的两条原则,依据这两条原则对传统组装提出改进方案。通过有限元模拟和高压合成实验证实旁热式组装更有利于金刚石的生长。建立了旁热式组装的三维有限元模型,分析腔体内温场分布情况,解释了“荒地”的成因,给出了金刚石生长区域在棒料上的分布图,结果表明:热量由加热管流向棒料的内部,棒料中心温度梯度最小;沿轴向钢帽处有大量热量的散失,造成合成腔内温差过大(300℃),这也是存在较大“荒地”的主要原因;功率为3500W时,金刚石生长区域位于棒料中心,生长区域面积最大,金刚石质量最好。为降低腔体内温度降,在传统旁热式组装合成棒两端添加辅助热源。经有限元分析,腔体内温度分布更加均匀,总温度降减小30%;“荒地”面积得到了很好地控制,在最佳合成功率3440W时完全可以消除“荒地”。我们的研究为高压合成组装的设计和改进提供了一般性的思路,对合成工艺的改进也有一定的参考价值。
[Abstract]:In this paper, the finite element method is used to simulate the temperature field in a high pressure synthesis cavity. Two principles of cavity assembly design are put forward, according to which the improvement scheme of traditional assembly is put forward. It is proved by finite element simulation and high pressure synthesis experiment that the side thermal assembly is more favorable for diamond growth. The three-dimensional finite element model of side-heat assembly is established, the distribution of temperature field in cavity is analyzed, the cause of "wasteland" is explained, and the distribution map of diamond growing region on bar material is given. The results show that the heat flow from the heating tube to the interior of the bar, the temperature gradient in the center of the bar is the smallest, and a large amount of heat is lost along the axial steel cap, which causes the temperature difference in the synthesis cavity to be too large (300 鈩，

本文编号：2083146