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Preparing method of silica ceramics of special-shaped structure

A technology for quartz ceramics and products, applied in the field of preparation of complex-structured quartz ceramics, can solve problems such as complex shape and internal structure of quartz ceramics, and achieve the effects of good appearance, fewer internal defects, and enhanced fluidity

Inactive Publication Date: 2017-01-18
FOSHAN GAOMING DISTRICT MINGCHENG TOWN NEW ENERGYNEW MATERIAL IND TECH INNOVATION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Considering the problems existing in the process of preparing quartz ceramic products in the prior art, water in the prior art is not used as the liquid phase in the quartz powder slurry in the present invention, but the quartz powder is added after the auxiliary agent is added. Mixing with the melted binder enhances its fluidity and the connection force between powder materials, and solves the molding problem of quartz ceramic products with complex shapes and internal structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Powder Mixing

[0025] The purity of the selected high-purity fused silica powder raw material is greater than 99.99wt%.

[0026] Mix the selected fused silica powder, wherein the particle size distribution and mass fraction of the fused silica powder are: 1-5μm, 5%; 5-18μm, 10%; 18-30μm, 20%; 30-40μm , 35%; 40-60 μm, 20%; 60-100 μm, 10%; add the above-mentioned high-purity fused silica powder to 0.55% of the quality of the quartz powder and 0.15% trisodium bicarbonate, and stir evenly to obtain a mixed powder material.

[0027] Compared with the raw material selection of ordinary fused silica ceramic products, the overall particle size of the fused silica raw material powder selected in this example is relatively small, mainly because of the compatibility between the binder and the powder material and the efficiency of the subsequent firing steps The problem is that the selection of raw material powder with a small overall particle size can improve the unifor...

Embodiment 2

[0035] In this embodiment, the process conditions and raw materials are consistent with those in Example 1, the difference is that in step 1, the high-purity fused silica powder is also added with Si that accounts for 0.6% by mass. 3 N 4 Powder. The particle size of the powder is 10 μm.

Embodiment 3

[0037] In this embodiment, the process conditions and raw materials are consistent with those in Example 1, the difference is that in step 1, the high-purity fused silica powder is also added with 1% Al 2 o 3 Powder. The particle size of the powder is 15 μm.

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Abstract

The invention discloses a preparing method of silica ceramics of a special-shaped structure. The preparing method includes the steps that 1, high-purity fused silica powder is mixed, and lactic acid and sodium sesquicarbonate are added into the high-purity fused silica powder and stirred uniformly to obtain mixed powder; 2, binder accounting for 12-18% of the mass of the silica powder in the step 1 is weighed and heated in a water bath to be melted, and then the mixed powder prepared in the step 1 is poured into the binder and stirred uniformly to obtain slurry; 3, the slurry prepared in the step 2 is injected into a mold, a cooling system of the mold is used for cooling the slurry so that the slurry is cooled and solidified, and a formed blank is taken out; 4, the formed blank in the step 3 is heated until oxidized polyethlene wax and Vaseline in the formed blank are completely evaporated or flow out, the furnace temperature is raised to 1100-1300 DEG C to fire the blank, the temperature is kept for 5-6 h, and the blank is cooled in a furnace to obtain the needed silica ceramics.

Description

technical field [0001] The invention belongs to the field of preparation of quartz ceramics, and in particular relates to a preparation method of complex-structured quartz ceramic products. Background technique [0002] Quartz ceramics refer to products made of quartz glass or fused quartz as raw materials, which are prepared by crushing, molding, and firing. Quartz ceramics have been widely used due to their advantages such as good thermal expansion coefficient, good thermal shock stability, and chemical corrosion resistance. However, due to the high viscosity of quartz ceramics, the volatility also increases with the increase of temperature, so it is difficult to produce large-scale complex-shaped quartz ceramic products by the usual process for producing silicate glass products. [0003] Most of the current technology adopts the method of gypsum mold slurry casting to produce quartz ceramic products. This method has the following disadvantages: 1) The appearance and shap...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/632C04B35/63C04B35/634
CPCC04B35/14C04B35/6303C04B35/632C04B35/63408C04B35/63492C04B2235/3206C04B2235/3217C04B2235/3873C04B2235/442C04B2235/6022
Inventor 麦浩
Owner FOSHAN GAOMING DISTRICT MINGCHENG TOWN NEW ENERGYNEW MATERIAL IND TECH INNOVATION CENT
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