High-strength Si3N4-BN modified esterified polyvinyl alcohol heat conduction material and preparation method thereof
A technology of polyvinyl alcohol and heat-conducting materials, applied in the field of polyvinyl alcohol heat-conducting materials, can solve problems such as poor thermal conductivity and flame retardancy, low melting point of polyvinyl alcohol materials, poor thermal stability, etc., to improve the curing degree , Improve thermal conductivity and thermal conductivity, enhance the effect of interfacial tension and residual stress
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[0027] F-doped Si 3 N 4 -SiC preparation method comprises the following steps:
[0028] (1) Add an appropriate amount of ethanol to the reaction flask, and then add Si 3 N 4 , SiC, NaF and Na 2 SiF 6 , the molar ratio of the four substances is 8-12:1:0.5-0.8:0.4-0.6, the solution is transferred to a planetary mill, the revolution speed is 50-70 rpm, the rotation speed is 580-620 rpm, and ball milling is carried out. Until all the materials pass through a 300-400 mesh sieve, the materials are placed in an oven to be heated and dried to remove ethanol to obtain a solid mixture.
[0029] (2) Put the solid mixture in the atmosphere pressure sintering furnace, and pass high-purity N 2 , keep the pressure in the sintering furnace at 32-35 MPa, heat up at a rate of 5-10 °C, and heat-preserve and calcinate at 1780-1800 °C for 2-4 h to prepare F-doped Si 3 N 4 -SiC.
[0030] The quercetin-modified boron nitride (BN) preparation method comprises the following steps:
[0031](1...
Embodiment 1
[0037] (1) Preparation of F-doped Si 3 N 4 -SiC component 1: add an appropriate amount of ethanol to the reaction flask, and then add Si 3 N 4 , SiC, NaF and Na 2 SiF 6 , the molar ratio of the four substances is 8:1:0.5:0.4, the solution is transferred to a planetary mill, the revolution speed is 50 rpm, and the rotation speed is 580 rpm, and ball milling is carried out until the materials are all passed through a 300 mesh screen. The material is heated and dried in an oven to remove ethanol to obtain a solid mixture. The solid mixture is placed in an atmosphere pressure sintering furnace, and high-purity N 2 , keeping the atmosphere pressure in the sintering furnace at a pressure of 32 MPa, heating at a rate of 5 °C, and calcination at 1780 °C for 2 h to prepare F-doped Si 3 N 4 - SiC component 1.
[0038] (2) Preparation of quercetin-modified boron nitride (BN) component 1: add appropriate amount of distilled water and ethanol to the reaction flask, the volume ratio ...
Embodiment 2
[0041] (1) Preparation of F-doped Si 3 N 4 -SiC component 2: add an appropriate amount of ethanol to the reaction flask, and then add Si 3 N 4 , SiC, NaF and Na 2 SiF 6 , the molar ratio of the four substances is 8:1:0.8:0.4, the solution is transferred to a planetary mill, the revolution speed is 70 rpm, and the rotation speed is 580 rpm, and ball milling is carried out until the materials are all passed through a 300-mesh sieve. The material is heated and dried in an oven to remove ethanol to obtain a solid mixture. The solid mixture is placed in an atmosphere pressure sintering furnace, and high-purity N 2 , keeping the atmosphere pressure in the sintering furnace at a pressure of 35 MPa, heating at a rate of 5 °C, and calcination at 1800 °C for 2 h to prepare F-doped Si 3 N 4 - SiC component 2.
[0042] (2) Preparation of quercetin-modified boron nitride (BN) component 2: add appropriate amount of distilled water and ethanol to the reaction flask, the volume ratio o...
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