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提出一种实验研究薄表面层形成和生长的涂覆法。利用该方法,以KH_2PO_4(KDP)晶体Z切片为载体,探究晶体的某些部位,比如(001)面、棱边、柱面在薄表面层形成以及生长过程中所起的作用。结果表明,当Z切片的(001)面上的棱边被覆盖,会首先以小晶锥的形式在(001)面形成新棱边,然后自新棱边沿(101)面切线方向出现薄表面层生长;当整个(001)面被覆盖,柱面生长一定时间并形成新棱边,之后也会出现薄表面层生长;当(001)面被涂覆分割,各分割部分能在各自的新棱边形成后以薄表面层方式形成独立的锥体,而在锥体间的棱边恢复后,独立锥体相应锥面能实现连接。可见,棱边是薄表面层形成的先决条件。对各种涂覆处理的Z切片通过光学显微镜实时观测,发现棱边在薄表面层形成中起关键作用,而柱面能提供台阶,在薄表面层生长中起重要作用;同时,得到了不同涂覆处理方式下薄表面层切向生长速度和动力学系数。
An experimental method to study the formation and growth of thin surface layer is proposed. Using this method, the Z slice of KH_2PO_4 (KDP) crystal was used as a carrier to explore some parts of the crystal, such as (001) surface, edge and cylinder, which play a role in the formation and growth of thin surface layer. The results show that when the edge on the (001) surface of the Z slice is covered, a new edge will be formed on the (001) surface in the form of a small crystal cone first, and then a thin surface appears in the tangential direction from the edge of the new edge (101) Layer growth; when the entire (001) surface is covered, the cylinder growth for some time and the formation of a new edge, then there will be thin surface layer growth; when the (001) surface is coated and divided, After the edge is formed, an independent cone is formed by the thin surface layer, and after the edge between the cones is restored, the corresponding cone of the independent cone can be connected. As can be seen, the edge is a prerequisite for the formation of a thin surface layer. Real-time observations of various coated Z sections with an optical microscope revealed that the edges played a key role in the formation of thin surface layers that provided steps that played an important role in the growth of thin surface layers; at the same time, different Tangential Growth Rate and Kinetic Coefficients of Thin Surface Layer under Coating Treatment.