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Collidal forming process for preparing high strength light ceramic material

A technology of colloidal molding and ceramic materials, which is applied in the direction of ceramic products, applications, household appliances, etc., to achieve the effect of easy realization of process conditions, uniform internal structure and simple process

Inactive Publication Date: 2007-11-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the search, there is no report on the preparation of ultra-light, high-strength ceramic materials by colloidal molding process at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] 1) Preparation of green body: using monomers (including organic monomers and inorganic monomers), high molecular polymers, solvents, initiators or chelating agents, and ceramic powders as raw materials, prepare a solid phase volume content of 5 to 45vol % of the suspension, the suspension is solidified in situ by monomer gel polymerization or polymer crosslinking, and a low-density, high-strength ceramic body is prepared:

[0019] 2) After demolding the wet green body, ventilate and dry the green body at a temperature where the solvent volatilizes, while ensuring that the dry shrinkage of the green body is less than 1%;

[0020] 3) In the heating debinding furnace, according to the heating rate of 2 ~ 5 ℃ / min to the temperature at which the organic matter volatilizes, and keep it warm for 1.5 ~ 3 hours to remove the organic matter;

[0021] 4) In the pressureless high-temperature sintering furnace, according to the different properties of the ceramic raw materials, he...

Embodiment 1

[0023] Example 1: Preparation of ultra-light and high-strength alumina ceramics by tert-butanol / acrylamide system

[0024] At a temperature of 25°C, acrylamide monomer, methylene bisacrylamide and tert-butanol were mixed in a mass ratio of 14.5:0.5:85 to form a pre-prepared solution, and the submicron Grade alumina powder, ball milled at 25-30°C for 24 hours to obtain a stable ceramic suspension. Add ammonium persulfate or sodium alginate aqueous solution with a mass fraction of 40% to the suspension, the amount of ammonium persulfate is 4% of the total weight of the suspension, stir evenly and pour into the mold, then place the suspension together with the mold in a 40°C water bath In the process, the acrylamide monomer in the suspension will complete the polymerization in about 30 minutes, so that the green body can be solidified in situ. Put the low-density wet green body in a blast drying oven and dry it completely at 40°C. At this time, the dry line shrinkage of the gree...

Embodiment 2

[0025] Example 2: Preparation of ultra-light and high-strength ceramic parts by PVC / camphene system

[0026] At a temperature of 55°C, PVC and camphene (Camphene) were mixed according to a mass ratio of 10:90 to prepare a pre-prepared solution, and submicron alumina powder was added according to a solid phase volume fraction of 5vol%. Sealed ball milling under the condition of ℃ for 24 hours to obtain a stable ceramic suspension. The suspension is injected into the mold, the temperature is lowered to room temperature (about 20°C), the camphene in the suspension crystallizes, and the PVC polymer is cross-linked at the same time, so that the green body is molded and solidified; the solidified green body is demoulded, and the Under ventilation conditions at room temperature (25°C), the solvent zene is directly sublimated, and at the same time, the PVC polymer is further cross-linked to obtain an ultra-light green body with a compressive strength exceeding 0.5 MPa and a relative d...

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Abstract

The present invention belongs to the field of ceramic material preparing technology, and is especially colloidal state forming process for preparing light high strength ceramic material. The process includes the following steps: preparing suspension with very low solid phase content with special organic monomer, solvent, initiator or chelating agent, and ceramic powder; in-situ solidification through gel polymerization of monomer or high molecular cross-linking to obtain ceramic biscuit; drying, removing binder and no-pressure high temperature sintering to obtain light high strength ceramic material. The present invention can control the porosity and pore size of the ultimate product through altering the solid phase content in the suspension, the sintering condition and the powder size. The present invention has simple technological process, low cost, environment friendship and other advantages, and the produced ceramic material has wide application range.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic materials, and in particular relates to a new method for preparing light-weight and high-strength ceramic materials by using a colloidal molding process. Background technique [0002] Ceramic materials have outstanding characteristics such as high temperature resistance, corrosion resistance, high strength, and high hardness. In many fields such as chemical industry, aerospace, biology, energy, and environmental protection, ceramic materials with ultra-low density, uniform internal microstructure, and high strength are often required. Lightweight ceramic materials, such as in aerospace vehicles, the reduction in material weight will greatly reduce the power consumption rate; as biomaterials, they are also required to have the characteristics of low density and high strength. In order to meet this demand, the common solution is to prepare foam The porosity of ceramics and foam cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B38/06
Inventor 黄勇陈瑞峰汪长安林伟渊
Owner TSINGHUA UNIV
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