Once-fired Varistor Ceramics Process And Properties Of The Dual Function Of The Preparation Of Strontium Titanate

ceramic varistor is a kind of material with double functions. It can be used as capacitor and varistor. It has a great deal of characteristic, such as low sensing-voltage, big dielectric constant and restraining the wave which voltage is lower than the standard. Its good properties have been utilized widely. Now, SrTiO3 powder can be produced by many means, of which water-heating and chemical codeposition are most important. At the present, SrTiO3 ceramic varistor is often prepared by the single-fired method. During the production, reducing atmosphere is created by H2. But H2 can bring about big danger. To avoid this sequent, N2 and lead are adopted to create reducing atmosphere. The effect is good. To decrease the sensing-voltage, CuO and MnCO3 are used as acceptors. We found the effect of doped CuO was better. At the same time, the experiment results indicate that acceptor doping is very important for SrTiOs ceramic, and that La-Cu combination is a prospective ingredient makeup. Doping with two donors is better than with single donor. "0.6mol%Nb2O5+0.3mol%La2O3" is the most arrangement of former and The most arrangement of latter is 1.2mol%La2O3.