P_(2)O_(5)含量对CaO-B_(2)O_(3)-La_(2)O_(3)玻璃/Al_(2)O_(3)系LTCC生瓷烧结性能的影响

Influence of P_(2)O_(5) Content on Sintering Behavior of CaO-B_(2)O_(3)-La_(2)O_(3)/Al_(2)O_(3) Glass-Ceramic Composites for LTCC

CaO-B_(2)O_(3)-La_(2)O_(3)(CBL)系玻璃具有优良的介电性能,可用于制备高频封装用低温共烧陶瓷(LTCC)生瓷。CBL系玻璃粉体烧结过程中的析晶特性等会影响其烧结致密度,进而影响材料的力学和介电性能。研究发现,CBL玻璃的析晶温度较低,导致烧结致密化过程中玻璃粉体过早出现晶相,影响粉体烧结的流动性和润湿性。在CBL玻璃中适当引入P_(2)O_(5)可有效改善粉体烧结性能和过早析晶的现象。当玻璃粉体与Al_(2)O_(3)粉体共烧时,两相的润湿性和烧结致密性均有明显改善,力学性能和介电性能显著提高。P_(2)O_(5)加入量过高会破坏玻璃网络结构,导致析晶温度降低,影响玻璃粉体与Al_(2)O_(3)粉体的烧结致密性,进而导致材料性能恶化。研究结果表明,P_(2)O_(5)含量为5%(摩尔分数,下同)时复合材料拥有最好的综合性能,且可同银导体良好匹配共烧。

With excellent dielectric properties,CaO-B_(2)O_(3)-La_(2)O_(3)glasses can be used for the preparation of LTCC green tape for high-frequency packaging.The crystallization behavior of CBL glass powders during the sintering process affect the sintering densification,which in turn influences the mechanical and dielectric properties of the material.It is found that the crystallization temperature of CBL glass is low,which leads to early appearance of crystalline phase in the sintering densification process and affects the fluidity and wettability of the powder sintering.The proper introduction of P_(2)O_(5)into CBL glass can effectively improve the sintering performance and the phenomenon of early crystallization.When co-fired with Al_(2)O_(3)powder,the sintering densification and wettability between the two phases are dramatically improved,thereby,significantly improving the mechanical and dielectric properties.Excessive addition of P_(2)O_(5)will spoil the glass network structure,resulting in lower crystallization temperature,which affects the sintering densification of glass powder and Al_(2)O_(3)powder,and in turn leads to the deterioration of material properties.The study demonstrates that the composite has the best overall performance at 5mol%of P_(2)O_(5)and can be co-fired well with silver electrode.