ZrO2对尾矿微晶玻璃析晶及断裂韧性的影响

Effect of ZrO2 on Crystallization and Fracture Toughness of Tailing Glass-ceramics

尾矿微晶玻璃的制备实现了固体废弃物的清洁、高值及高效利用,其具有的高力学性能可作为冶金、电力、矿山等领域高耐磨、耐腐蚀输运管道使用。尾矿微晶玻璃断裂韧性的提高必然会进一步拓宽其应用领域。通过外加ZrO2,研究其对尾矿微晶玻璃析晶及断裂韧性的影响规律。通过XRD、DTA等测试研究了ZrO2对微晶玻璃析晶特性的影响。结果表明,随着ZrO2含量的增加,微晶玻璃析晶放热峰右移,主晶相晶格参数增加。微晶玻璃的密度、耐酸性、弹性模量及剪切模量均随ZrO2含量的增加呈现先增加后降低的趋势,维氏硬度及裂纹扩展长度先减小后增大。最终导致微晶玻璃的断裂韧性先增大后降低。ZrO2含量为2.6 wt%时,其最大断裂韧性达到2.2 MPa·m^1/2。

The preparation of tailing glass-ceramics has achieved the clean, high value and high efficiency of solid waste, and the tailing glass-ceramics with high mechanical properties can be used as high wear resistance and corrosion resistant pipelines in metallurgy, electric power and mine. The improvement of fracture toughness of tailing glass-ceramics will broaden its application further. The effect of ZrO2 on crystallization characteristic and fracture toughness of tailing glass-ceramics had been investigated. The effects of ZrO2 on the crystallization characteristics of glass-ceramics were studied by XRD and DTA. The results show that with the increase of ZrO2 content, the crystallization temperature shift toward higher temperature and the lattice parameter of main crystal phase increases. The density, acid resistance, elastic modulus and shear modulus of glass-ceramics first increase and then decrease with the increase of ZrO2 content, and the Vickers hardness and crack growth length decrease first and then increase. And finally the fracture toughness of the glass-ceramics increases first and then decreases. When the content of ZrO2 is 2.6 wt%, the maximum fracture toughness is 2.2 MPa· m^1/2.