Study Of Borosilicate Glass/Alumina Substrate Material Of Micro-Fuse

As the micromation of modern electric products, multi-layer micro fuse with minisize, high safety and good precision emerged. The key technology of multi-layer micro fuse is the substrate material which can be sintered with fuse metal such as Ag at a low temperature. This substrate material with low sintering temperature is called LTCC (low temperature co-fired ceramic).Foreign companies keep the LTCC technology secret to make benefit, so research on LTCC material and indigenous patent of LTCC technology is very important for our country electric industry. This paper introduced some outstanding LTCC material and compared the properties of these products. we chose borosilicate glass as search object though analyses and first experiment. The substrate material We prepared with borosilicate glass and alumina can be sintered at low temperature (660℃) which meet the requirement of micro-fuse. The paper studied the impact of different technics to the properties of the substrate, we also studied the melting down property of Ag. the main conclusions are:1.Li₂O- B₂O₃- SiO₂- Al₂O₃ glass is chosen as the main composition of LTCC material. we designed and optimize the composition of the Li₂O- B₂O₃- SiO₂- Al₂O₃ glass, Li₂O- B₂O₃-SiO₂- Al₂O₃ glass which has low sintering temperature is made by melt experiment, the composition is Li₂O 12.01wt%,B₂O₃ 34.59wt%,SiO₂ 37.42wt%,A;₂O₃15.88wt%;2. The technics micro-fuse substrate which is composed of Li₂O-B₂O₃- SiO₂- Al₂O₃ glass and alumina was optimized, the optimized substrate material with glass content 60%-65% and alumina content 40%-35% is sintered at low temperature(660℃), and the strength of the substrate is 20.0MPa-36.6MPa, Linear shrinkage rate is 2.9%-1.1%, dielectric lose is 0.23-0.21, meet the requirement of macro fuse substrate.3.The melt down simulation experiment simulated the melt down process of Ag on the substrate. The paper analyzed the characteristic of Ag melt down, analyzed the impact of technics to the characteristic of Ag melting down process. The melt down simulation experiment shows that: the increase of porosity accelerate the wastage of Ag. The glass phase accelerate the inleakage of Ag.