Preparation method of high-density fused quartz ceramic
A technology of fused silica and density, applied in the field of ceramic materials, can solve the problems of low efficiency, poor material reliability, low strength, etc., and achieve the effect of simple and easy process, increased reliability, and improved uniformity
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Embodiment 1
[0034] 1. Preparation of fused silica molding slurry
[0035] The raw material used in the examples is fused silica powder with a purity greater than 99.99wt%.
[0036]Mix high-purity fused silica powder according to the following particle size distribution and mass percentage: 5-8μm, 5wt%; 8-21μm, 8wt%; 21-58μm, 15wt%; 58-114μm, 36wt%; 114-160μm , 21 wt %; 160-175 μm, 15 wt %. Add the above high-purity fused silica powder to deionized water, 0.26% polyvinyl alcohol, 0.38% lactic acid, and 0.2% trisodium bicarbonate to make a slurry with a solid content of 80vol%.
[0037] Mix 40wt% acrylamide aqueous solution and N,N-methylenebisacrylamide at a mass ratio of 23:1, stir and dissolve to obtain a premix.
[0038] Mix the slurry, zirconia powder, and premix prepared above at a mass ratio of 40:1:4, disperse for 60 minutes at a speed of 750r / min, then add ammonium persulfate accounting for 3.5% of the mass of the premix, and stir evenly Obtain molding slurry. The particle size...
Embodiment 2
[0043] In this embodiment, the process conditions and raw materials are consistent with those in Example 1, the difference is that 0.55% of Si is added to the fused silica powder and accounts for 0.55% by mass. 3 N 4 powder, and Si 3 N 4 The particle size of the powder is 45 μm.
Embodiment 3
[0045] In this embodiment, the process conditions and raw materials are consistent with those in Example 1. The difference is that 0.5% of the silica airgel micropowder is added to the fused silica powder, and the silica airgel The specific surface area is 450m 2 / g, the density is 65kg / m 3 .
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