Self-enhancement-toughening silicon nitride/ aluminium nitride/ lanthanum barium silicate glass ceramics ternary composite material with self-enhancement-toughening and preparing method of ternary composite material

Abstract

The invention discloses a self-enhancement-toughening silicon nitride / aluminum nitride / lanthanum barium silicate glass ceramics ternary composite material with self-enhancement-toughening and a preparing method of the ternary composite material. The ternary composite material adopts lanthanum barium silicate glass powder, aluminum nitride powder and alpha-silicon nitride powder as raw materials, is prepared through blanking and sintering, and contains beta-silicon nitride rod-like crystal. The silicon nitride / aluminum nitride / lanthanum barium silicate glass ceramics ternary composite material has the advantages of being low in density, high in strength, high in fracture characteristic, high in dielectric constant, low in inflation coefficient, high in conductivity and the like. The preparing method of the ternary composite material is simple in preparing process and low in the glass melting temperature and the composite material sintering temperature, and the ternary composite material is friendly to environment and low in production cost. The prepared ternary composite material has a good application prospect, can partially replace an existing high temperature structure material, and is applied in the fields of national defense and military industries, electronic devices, high thermal conductivity ceramic baseplates, high-end ceramic parts and the like.

Description

technical field [0001] The invention relates to a self-reinforcing and toughening silicon nitride / aluminum nitride / lanthanum aluminum silicate glass-ceramic ternary composite material and a preparation method thereof, belonging to the technical field of ceramic materials. Background technique [0002] Aluminum nitride ceramics have many excellent properties, such as good thermal conductivity, very high insulation, etc., so it is widely used, such as insulating substrates, heat dissipation substrates, gate insulating layers, pressure sensors, chemical sensitive components, Surface acoustic wave devices, insulating buried layers, substrate materials, gallium nitride epitaxial substrate materials, abrasive materials, wear-resistant and corrosion-resistant parts, etc. Although aluminum nitride ceramics have excellent comprehensive properties, they are still restricted by many technical factors in the production process of aluminum nitride ceramics. Due to its own characteristic...

AI Technical Summary

Problems solved by technology

Self-grown β-silicon nitride rod crystal reinforced glass-ceramic composite material is a new preparation process developed in the past ten years. The microstructure of the glass-ceramic composite material with good effect, thereby improving the mechanical properties of the material, but the glass-ceramic composite material reinforced by whiskers, fibers, and rod crystals in the prior art has poor compatibility between the fiber and the matrix, and the interface Defects and thermal performance mismatch issues

In the prior art, there is no self-grown β-silicon nitride reinforced and toughened silicon nitride / aluminum nitride / lanthanum barium aluminosilicate glass-ceramic ternary composite material scheme and related literature reports

Images