2 results about "Lead tetraoxide" patented technology

The invention discloses a PTC ceramic material and a preparation method thereof, and relates to the technical field of PTC, and the PTC ceramic material is prepared from the following components: 50-65 parts of barium titanate, 12-16 parts of lead tetraoxide, 0.1-0.3 part of yttrium oxide, 0.1-0.3 part of lanthanum oxide, 6-15 parts of modified silicon boride, 4-10 parts of aluminum oxide, 1-3 parts of ammonium polyacrylate, and 3-6 parts of polyvinyl alcohol. Through synergistic cooperation of a barium titanate main body and functional fillers such as modified silicon boride, leap-type improvement of the comprehensive performance of the PTC ceramic material is realized, on the basis of maintaining excellent PTC characteristics, the heat conductivity coefficient and the breaking strength of the material are effectively improved, the thermal shock resistance and the mechanical reliability are remarkably enhanced, and the PTC ceramic material has good application prospects. The method is especially suitable for the high-end application fields of automotive electronics, industrial control, high-power LED driving and the like.

This application relates to the field of ceramic materials technology, specifically disclosing a ceramic material for PTC thermistors and its preparation method. The ceramic material for PTC thermistors includes the following raw materials: barium titanate, silane-modified alumina-coated lead tetroxide-silicon boride in-situ composite powder, rare earth oxides, alumina, ammonium polyacrylate, and polyvinyl alcohol. This application adds the silane-modified alumina-coated lead tetroxide-silicon boride in-situ composite powder to the ceramic material. The alumina directionally coats the lead tetroxide, effectively suppressing the volatilization of lead vapor during high-temperature sintering and improving the environmental friendliness of the ceramic material. Simultaneously, the in-situ composite bonding of lead tetroxide and silicon boride, combined with silane modification, improves the interfacial bonding ability between the composite powder and the barium titanate matrix, reducing internal stress during ceramic sintering and improving the mechanical properties of the ceramic material.