Si for a microwave kiln 2 no 2 o Wave-transmitting-heat-insulating integrated lining material and preparation method thereof

Abstract

The invention belongs to the field of refractory materials, and in particular relates to a Si2N2O wave transmission-heat insulation integrated inner lining material for a microwave kiln, and a preparation method of the material. The preparation method of the Si2N2O wave transmission-heat insulation integrated inner lining material for the microwave kiln comprises the following step: calcining silicon nitride gel, the surface of which is coated with SiO2, for 60-80min at the temperature of 1600-1750 DEG C under the protection of inert atmosphere so as to obtain the Si2N2O wave transmission-heat insulation integrated inner lining material. The Si2N2O wave transmission-heat insulation integrated inner lining material for the microwave kiln has the porosity of 60-70%, the dielectric constant of 3.4-5.3 and the dielectric loss tg delta of less than 2.5*10<-3>; the material is excellent in heat preventing and heat insulation performances, bearing performance, impact resistance, wave transmittance and the like under the harsh conditions of high temperature, high pressure, strong corrosion and the like, thus having better application prospect in the aspect of microwave high temperature sintering kilns.

Description

technical field

[0001] The invention belongs to the field of refractory materials, in particular to a Si 2 N 2 O Wave-transparent-heat-insulating integrated lining material and preparation method thereof. Background technique

[0002] Microwave heating has become a rapidly developing research hotspot in recent years because it produces no waste water, waste gas, and waste, is green and environmentally friendly, has fast densification speed, saves energy, and homogeneous body heating can make the microstructure of materials uniform, thereby improving material properties.

[0003] The essence of microwave sintering is that the sample relies on its own dielectric loss to absorb microwaves, and generates heat from the inside, presenting a volume "thermal effect" process. Due to the particularity of the interaction between microwaves and substances, refractory materials used as thermal insulation structures in microwave kilns also have special requirements. : In addition to exc...

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