Method for preparing thin-walled ceramic crucible

A ceramic crucible and thin-walled technology, which is applied in the field of preparation of thin-walled ceramic crucibles, can solve the problems of neurotoxicity of monomers and functional cross-linked bodies, harsh process control conditions, and easy production of waste products, so as to reduce cracking easily and simplify The effect of post-processing and low cost

Active Publication Date: 2013-12-11
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The patent "A Titanium and Titanium Alloy Melting Crucible Material" (Patent No. CN1583670A) introduces a method of preparing ceramic crucibles by isostatic pressing. This method is suitable for thicker walls, simple shapes, and contains aggregate particles. Wait for the molding of the crucible, and the obtained product needs to be ground and processed, which is easy to produce waste products; the patent "Preparation Method of a Large Quartz Ceramic Crucible" (Patent No. CN 101880166A) is prepared for polycrystalline silicon smelting by using the gel column molding process With thin-walled quartz crucibles, the industrial application of gel injection molding is not yet very mature. In addition, the process control conditions are relatively harsh, and the post-drying is easy to crack the green body. At the same time, the monomers and functional cross-linked products used are neurotoxic.

Method used

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  • Method for preparing thin-walled ceramic crucible

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The solid ceramic powder by mass percentage: fused mullite (300 mesh) 60 wt%, α-Al 2 o 3 Micropowder (D50=3μm) 30wt%, bentonite 8wt%, kaolin 2wt% are fully mixed to make a uniform ceramic powder.

[0022] The solvent is composed of 75% water, 0.45% polyvinyl alcohol PVA, 0.05% sodium polyacrylate as a dispersant, and 24.5% silica sol (30% concentration).

[0023] The proportion of powder and solvent by weight: powder 75%, solvent 25%, and a uniform ceramic slurry is made by fully stirring.

[0024] Select a paper blister mold with a layer of wax pattern on the inner wall, coat a layer of water-absorbing resin film on its surface, pour the mixed ceramic slurry on the surface of the paper mold until the mold is covered with ceramic slurry, static Set the mold to absorb water, make the green body reach a certain thickness by repeated pouring, and then dry it. Send the dried biscuit together with the paper mold into a high-temperature firing furnace for sintering, raise ...

Embodiment 2

[0026] According to the mass percentage of solid powder: industrial alumina powder 200~400 mesh 60wt%, α-Al 2 o 3 35wt% of fine powder and 5wt% of kaolin are fully mixed to make a uniform ceramic powder.

[0027] The solvent is composed of 82% water, 3% dextrin, 0.13% sodium polycarboxylate dispersant, 0.005% sodium dodecylbenzenesulfonate, and 11.865% pulping waste liquid.

[0028] The weight ratio of the powder and the solvent is 68% of the powder and 32% of the solvent, and a uniform ceramic slurry is made by fully stirring.

[0029] Choose a mold made of polytetrafluoroethylene, coat a layer of water-absorbing resin film on its surface, fully put the processed mold in the mixed ceramic slurry, so that the surface of the paper mold is evenly coated with a layer of ceramic slurry The material is left to stand to make the mold absorb water, and the green body reaches a certain thickness through repeated pouring, and then dried. Send the dried biscuit together with the pape...

Embodiment 3

[0031] The solid ceramic powder is mixed according to mass percentage: fused yttrium oxide stabilized zirconia powder 350 mesh 75%, monoclinic zirconia micropowder 25wt% and fully mixed to make a uniform ceramic powder.

[0032] The solvent is composed of 90% water, 1.5% PVA, 0.2% sodium polyacrylate as a dispersant, and 8.3% water-soluble amino resin.

[0033] The weight ratio of powder and solvent is 85% of powder and 15% of solvent, and a uniform ceramic slurry is made by fully stirring.

[0034] Select a polyurethane resin blister mold, coat a layer of water-absorbing resin film on its surface, pour the mixed ceramic slurry on the surface of the paper mold until the mold is covered with ceramic slurry, let the mold absorb water, and repeat The green body is poured to a certain thickness, and then dried. Send the dried biscuit together with the paper mold into a high-temperature firing furnace for sintering, raise the temperature to 800°C at a certain heating rate, and kee...

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Abstract

The invention belongs to the technical field of wet molding of ceramics and provides a method for preparing a thin-walled ceramic crucible. The method comprises the following steps of: mixing solid ceramic powder with a solvent according to a certain proportion to prepare uniform and stable ceramic slurry; coating the surface of a mould with a layer of water-absorbing resin to enable the mould to have water absorbability; pouring the prepared ceramic slurry evenly on the surface of the mould to enable the water-absorbing resin on the surface of the mould to absorb water fully; repeating the above processes until the thickness of the poured ceramic slurry is satisfactory; drying the ceramic slurry which is poured on the mould; and putting the dried ceramic slurry with the mould in a high-temperature firing furnace for binder removal and sintering to obtain the thin-walled ceramic crucible after the mould is volatilized during sintering. The shape and the size of the ceramic crucible prepared by the method disclosed by the invention are controllable; the molding is convenient; demolding is unnecessary, so that damage and cracking of biscuits are reduced during demolding and post-process is simplified; density distribution of the crucible is uniform and the cost is low; and the crucible is convenient for industrial promotion.

Description

technical field [0001] The invention belongs to the technical field of ceramic wet forming, and mainly relates to a preparation method of a thin-walled ceramic crucible. Background technique [0002] Ceramic crucibles are mainly used for high-temperature sintering and smelting of materials, and at the same time as containers for chemical reactions at high temperatures. They have the advantages of good chemical stability, high temperature resistance, and corrosion resistance, and are widely used. At present, the main molding methods of ceramic crucibles include gypsum mold slip casting, gel injection molding, compression molding and the like. Thin-walled ceramic crucible has the characteristics of small wall thickness and high crucible wall. It is formed by traditional wet method. It is easy to damage the green body during the demolding process and cracks when it is dried. If it is formed by pressing, it will have uneven density. Uniform, the green body is easily damaged dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622B28B1/14
Inventor 王自强王刚王泽华王冬冬黄佳原
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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