A vacuum heat-insulating refractory product and its preparation method
A technology of refractory materials and vacuum insulation, applied in the field of refractory materials, can solve the problems of high cost, unusable, unfavorable large-scale commercial production, etc., and achieve the effects of low cost, reduced sintering shrinkage, and significant energy saving effect.
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Embodiment 1
[0027] A vacuum heat insulation refractory product, including a core material and a film wrapped around the core material, the core material is a mixture of 80% fumed silica powder and 20% aluminum silicate fibers evenly dispersed; the outer height of the core material The barrier film is a titanium oxide ceramic film;
[0028] The preparation process is:
[0029] Preparation of core material: Weigh fumed silica powder and aluminum silicate fiber with a diameter of 0.5mm and a length of 1-2mm, and the weight ratio is 4:1. The powder is staggered and interspersed with a certain integrity, and then pressed and formed into a core material;
[0030] Preparation of titanium oxide ceramic film: use casting machine to prepare titanium oxide ceramic film, first mix 90g of titanium oxide base material, 85g of polyvinyl alcohol aqueous solution with a concentration of 6%, and 7g of glycerin to prepare titanium oxide slurry. The prepared titanium oxide slurry is cast from the upper hop...
Embodiment 2
[0034] A vacuum heat-insulating refractory product, including a core material and a film wrapped around the core material. The core material is a mixture of 70% alumina powder and 30% zirconia crystal fibers evenly dispersed; The film is a heat-resistant alloy composite film;
[0035] The preparation process is:
[0036] Preparation of core material: Weigh alumina powder and zirconia crystalline fiber with a fiber diameter of 0.7mm and a length of 1-3mm, and the weight ratio is 7:3. The powder is staggered and interspersed with a certain integrity, and then pressed and formed into a core material;
[0037] Preparation of heat-resistant alloy composite film: first, mix 100g of heat-resistant alloy 1Cr18Ni9Ti powder, 85g of polyvinyl alcohol aqueous solution with a concentration of 7%, and 7g of glycerin to make a slurry, and then flow the prepared slurry from the upper hopper Extended to the stainless steel base belt, the green body is formed by the relative movement of the b...
Embodiment 3
[0041] A vacuum heat insulation refractory product, including a core material and a film wrapped around the core material, the core material is a mixture of 75% microporous titanium oxide powder and 25% alumina crystalline fiber evenly dispersed; The film is a high barrier silica glass film.
[0042] The preparation process is:
[0043]Preparation of core material: Weigh microporous titanium oxide powder and alumina fiber with a fiber diameter of 1-2mm and a length of 2-3mm, the weight ratio of which is 3:1, put the two into a mixer and mix them thoroughly to make the fiber Interlaced with the powder, with a certain integrity, and then pressed and formed into a core material;
[0044] Preparation of silica glass film: use a casting machine to prepare silica glass film. First, mix 95g of silica glass base material, 83g of 7% polyvinyl alcohol aqueous solution, and 6g of glycerin to make silica glass slurry Material, the prepared silica glass slurry is cast from the upper hopp...
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