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作 者:李鹏虎 金海云[1] 刘怀东 王昭 高乃奎[1] LI Penghu;JIN Haiyun;LIU Huaidong;WANG Zhao;GAO Naikui(State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China)
机构地区:[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049
出 处:《复合材料学报》2023年第8期4813-4820,共8页Acta Materiae Compositae Sinica
基 金:国家自然科学基金(52272073)。
摘 要:陶瓷材料的应用由于其烧结温度高、加工性能差而受到限制。以斜方硅钙石作为成瓷填料,低熔点玻璃粉作为助熔剂,纳米SiO_(2)作为补强剂,制备了硅橡胶基可陶瓷化复合材料。将这种复合材料作为可加工前驱体,在1000℃进行CaZnSi_(2)O_(6)玻璃陶瓷的烧结。研究了硅橡胶的质量分数和玻璃粉的含量对陶瓷材料力学性能的影响,研究了Bi_(2)O_(3)作为辅助助熔剂对陶瓷材料显微形貌、弯曲强度和介电性能的影响。结果表明:随着硅橡胶质量分数的减小或者玻璃粉含量的增加,陶瓷试样的弯曲强度先增大后减小。不加入Bi_(2)O_(3)时,经过1000℃烧结形成的陶瓷材料弯曲强度可以达到90.54 MPa,线性收缩率仅为15%。而适量的Bi_(2)O_(3)不仅可以提高显微形貌的致密度,使弯曲强度提高至110.48 MPa,还能够显著降低陶瓷材料在高温环境下的工频损耗,并且提高材料的工频击穿场强。本文制备的前驱体具有良好的加工性能,可以完成不同尺寸、不同形状的陶瓷材料的烧结。The applications of ceramics are limited by their high sintering temperatures and poor processability.The ceramizable silicone rubber composites were prepared using kilchoanite as a ceramic filler,low-melting-point glass frit as a flux,and nano SiO_(2)as a reinforcing agent.The CaZnSi_(2)O_(6)glass ceramics were sintered at 1000℃using the ceramizable composites as machinable precursors.The effect of the mass fraction of silicone rubber and the content of glass frit on the mechanical properties of the ceramics was studied.The effect of Bi_(2)O_(3)as a secondary flux on the microstructure,flexural strength and dielectric properties of the ceramics was investigated.The results show that the flexural strength of the ceramic samples increase first and then decrease with reducing the mass fraction of silicone rubber or increasing the content of glass frit.The maximum flexural strength of the ceramic samples without Bi_(2)O_(3)sintered at 1000℃is 90.54 MPa,and the linear contraction is only 15%.A proper content of Bi_(2)O_(3)not only improve the density of microstructure and increase the flexural strength to 110.48 MPa,but also decrease the tanδof the ceramics at power frequency and high temperature obviously,and improve the breakdown strength of the ceramics at power frequency.The precursors in this study have a good processability and could complete the sintering of ceramics with different sizes and shapes.
关 键 词:可陶瓷化复合材料 可加工前驱体 玻璃陶瓷 显微形貌 介电性能
分 类 号:TQ174[化学工程—陶瓷工业] TQ333[化学工程—硅酸盐工业]
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