DKDP表面潮解对其机械性能影响的研究

The Effects of DKDP Surface Deliquescence on Its Mechanical Properties

摘要: 本文采用显微拉曼光谱法和纳米压痕法对表面潮解后的磷酸二氘钾(DKDP)晶体进行了研究。光学显微镜下观察到样品表面出现大量微米级离散点状潮解区。拉曼光谱结果表明，潮解并未造成DKDP光谱的主要峰位发生改变。证明潮解过程并没有生成新的物质，不是化学反应。纳米压痕测试结果表明，荷载分别为10 g、20 g、30 g、40 g、50 g、60 g时，所测得的模量值和硬度值的变化趋势基本一致，在40 g模量随荷载增加从54.7 GPa下降至46 GPa (硬度从1.95 GPa下降至1.50 Gpa)，40 g以后随荷载增加模量上升至53 GPa (硬度上升至1.67 GPa)，表明DKDP表面机械性能受到潮解影响。

Abstract: This deliquesced surface of DKDP, deuterated potassium dihydrogen phosphate, was studied with microscopes Raman spectroscopy and Nano-indentation. Two Raman spectra were acquired at the surface of the specimen before and after it was deliquesced. Modulus and hardness were measured with Nano-indentation under 6 different loads. Discrete deliquesced spots were observed on the surface with an optical microscope. Results show that the Raman spectra, before and after de-liquesced, are almost the same. No new products are created after deliquesced and it is not a chemical change. 6 Loads are 10 g, 20 g, 30 g, 40 g, 50 g and 60 g. The measured modulus and hardness vary with increased loads and their variation trends are nearly identical. Before 40 g, the modulus decreases with the load from 54.7 GPa to 46GPa (hardness from 1.95 GPa to 1.50 GPa). From 40 g to 60 g, the modulus raised up to 53 GPa again (hardness raised up to 1.67 GPa). Thus, the mechanical properties of the deliquesced surface have been modified.