Preparation method of large solid quartz ceramic material

Abstract

The invention relates to a preparation method of a large solid quartz ceramic material and belongs to the technical field of quartz ceramic products. The preparation method comprises the following steps: preparing a mixed material: weighing the following substances in percent by mass: 15-35% of quartz coarse particles, 20-40% of quartz fine particles, 0.99-5.66% of a bonding agent, 15-30% of quartz fine powder, 8-20% of quartz micropowder and 8-15% of spherical quartz micropowder, and mixing the substances uniformly to form the mixed material; isostatic compaction: filling a rubber mold with the mixed material and vacuumizing the mold, and carrying out compression moulding at an isostatic press of 80-150 MPa to form a blank; and sintering process: sintering the blank in the step 2 according to a firing system, and carrying out furnace cooling to room temperature after fire stopping. The preparation method is scientific and reasonable and simple and feasible and the prepared quartz ceramic material is good in microstructure uniformity and has the characteristics of low porosity, high volume density and high constant temperature pressure resistance.

Description

technical field [0001] The invention relates to a preparation method of a large solid quartz ceramic material, belonging to the technical field of quartz ceramic products. Background technique [0002] Quartz glass ceramics are referred to as quartz ceramics for short. Due to their small thermal expansion coefficient, they are only 0.54×10 -6 / °C, which makes it have very good resistance to rapid cooling and rapid heating; the thermal conductivity of quartz ceramics is particularly low, and its thermal conductivity is only 2.1W / m.K, so it is an ideal heat insulation material; quartz ceramics have excellent chemical stability It has almost no effect on various metal melts, and has very good corrosion resistance to various glass slags. Therefore, ram bricks, cover bricks, parapet bricks and ceramic crucibles made of quartz glass are widely used in float glass furnaces, rare metals, special glass and polysilicon and other materials. With the continuous expansion of the applic...

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Problems solved by technology

[0004] The Chinese patent application number 200610070310.6 discloses a method for preparing quartz ceramics by isostatic pressing: it includes adding fused silica to a dispersant, a binder, a pore-forming agent, and a plasticizer to make a slurry, and the particle size of the fused silica is Control the mass between 150 mesh sieve and 325 mesh sieve to be 0-60% of the total mass of fused silica, and measure d90<60μm by laser particle size analyzer, and use spray granulation to make 80-250 mesh granules for isostatic pressing molding, forming The pressure is controlled at 20-300MPa, and products such as quartz ceramic radome and quartz ceramic ram brick are prepared, which solves the problem of poor microstructure uniformity in powder injection molding and gel injection molding, and long production cycle due to difficult dehydration And other issues

However, for quartz ceramic materials containing glassy coarse particles, the glassy fused silica particles are easy to cut through the rubber mold and cause molding difficulties; and for large solid quartz ceramic materials, full sintering according to the prior art requires prolonging the firing and holding time. Prolonging the holding time will lead to cristobalization and affect the performance of fused silica materials

After searching, no preparation method of large solid quartz ceramic material was found

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