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Study on the thermal stress evolution in large scale KDP crystals during the crystal extraction process

机译：晶体提取过程中大型KDP晶体中热应力演化的研究

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摘要

Transient numerical calculations were carried out to predict the evolution of temperature and thermal stress in traditionally grown large-size KDP crystals during the removal process, considering two methods that are used to accomplish the crystal extraction. The influence of the crystal size and the difference of temperature between the crystal and environment on the stresses inside the KDP crystals were also investigated in detail. Results indicate that, in both processes of isolating crystals, the highest stress transfers from the crystal periphery to the internal part from the early to the later time stage. In the case of extracting the crystal from solution directly after crystallization and exposing to air, the maximum stress at the crystal periphery is larger than that inside the crystal, and the probability of failure from the outside surface of crystals is large. In the case of retaining the solution for a time after crystallization, the maximum stress in the crystal internal region is larger than that of the crystal surface, leading to a large possibility to originate cracks in the inner region. Both increased crystal sizes and increased temperature differences between the crystals and the environment at the end of crystal growth are factors which aggravate crystal cracking. The maximum stress in crystals in the case of retaining the solution is less than that in the case of extracting the solution, which brings about a decreased likelihood of cracking. Thus, retaining solution for a period of time after the growth is completed, such as 96 h, is suggested to be adopted to accomplish successful crystal extraction.
机译：进行瞬态数值计算以预测在去除过程中传统生长的大尺寸KDP晶体中温度和热应力的演变，考虑到用于实现晶体提取的两种方法。还详细研究了晶体尺寸的影响和晶体和环境之间的温度差异，并详细研究了KDP晶体内的应力。结果表明，在隔离晶体的两个过程中，从早期到稍后的时间阶段将最高应力从晶体周边转移到内部部分。在结晶并暴露空气之后直接从溶液中提取晶体的情况下，晶体周边的最大应力大于晶体内部的最大应力，并且来自晶体外表面的失败概率大。在结晶后保持溶液的情况下，晶体内部区域中的最大应力大于晶体表面的最大应力，导致源自内部区域中的裂缝的可能性。晶体尺寸的增加和晶体生长结束时晶体和环境之间的温度差异增加是加重晶体裂缝的因素。在保持溶液的情况下晶体中的最大应力小于提取溶液的情况下，这使得裂解的可能性降低。因此，建议采用诸如96h的生长完成后的时间段的保留溶液，以完成成功的晶体提取。

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  • 来源
    《RSC Advances》 |2019年第36期|共9页
  • 作者

    Huang Pingping; Wang Shenglai; Ding Jianxu; Wang Duanliang; Wang Bo; Liu Hui; Xu Longyun; Zhang Liyuan; Li Xianglin; Liu Yining;

  • 作者单位

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ Sci &

    Technol Coll Mat Sci &

    Engn Qingdao 266590 Shandong Peoples R China;

    Qufu Normal Univ Coll Phys &

    Engn Shandong Prov Key Lab Laser Polarizat &

    Informat Qufu 273165 Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ State Key Lab Crystal Mat Jinan 250100 Shandong Peoples R China;

    Shandong Univ Coll Mat Sci &

    Engn Jinan 250061 Shandong Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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