Preparation method of high-density fused quartz ceramic
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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
Inactive Publication Date: 2017-01-04
FOSHAN GAOMING DISTRICT MINGCHENG TOWN NEW ENERGYNEW MATERIAL IND TECH INNOVATION CENT
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Problems solved by technology
The above-mentioned methods generally have the disadvantages of uneven microstructure, poor material reliability, low product density, and low strength, and are inefficient and difficult to adapt to the needs of mass industrial production.
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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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Abstract
The invention discloses a preparation method of high-density fused quartz ceramic. The preparation method comprises the following steps: A, mixing high-purity fused quartz powder, adding deionized water, polyvinyl alcohol, lactic acid and sodium sesquicarbonate and preparing slurry with solid content being 75 to 80 vol%; B, mixing 40 wt% of an acrylamide aqueous solution and N,N-methylene bisacrylamide, stirring and dissolving to prepare premixed liquid; C, mixing the slurry in the step A, a sintering aid and the premixed liquid in the step B, adding an initiator and preparing formed slurry; D, injecting the formed slurry prepared in the step C into a mold of a dynamic injection coagulation forming device, vibrating for 20 to 30 minutes, placing a green body and the mold into a drying oven, curing at the temperature of 72 to 78 DEG C for 3 to 4 hours, cooling, and opening the mold to obtain the required ceramic green body; E, firing and forming the green body in the step D in a high-temperature furnace at the temperature of 1175 to 1200 DEG C and preserving heat for 2 to 3 hours to prepare the required fused quartz ceramic.
Description
technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a preparation method of high-density fused silica ceramics. Background technique [0002] Quartz ceramics refer to products made of quartz glass or fused quartz as raw materials, only broken, shaped, fired and other ceramic manufacturing processes, also known as fused quartz ceramics, quartz glass ceramics. Due to a series of excellent properties such as excellent thermal shock stability, low thermal conductivity and low thermal expansion coefficient, fused silica ceramics have been more and more widely used in metallurgy, glass, chemical industry, aerospace and other fields. Fused silica ceramics mainly have the following advantages: [0003] 1) The coefficient of thermal expansion is small. The coefficient of thermal expansion (at room temperature) of pure fused silica ceramics is only 0.54×10 -6 / °C, has the same thermal expansion coefficient as quartz glass, an...
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