Gel-casting moulding technique for preparing silicon nitride ceramics heating element

A technology of gel injection molding and silicon nitride ceramics, applied in the direction of ceramic molding machines, manufacturing tools, etc., can solve problems such as not being perfect, staying in the laboratory stage, and not being able to be popularized and used, so as to improve production efficiency and production costs The effect of reducing and not easily deforming

Inactive Publication Date: 2009-04-01
SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the existing gel injection molding technology is not perfect, it o...

Method used

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  • Gel-casting moulding technique for preparing silicon nitride ceramics heating element
  • Gel-casting moulding technique for preparing silicon nitride ceramics heating element

Examples

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Embodiment 1

[0031] The monomer solution is prepared as follows: the organic monomer used is acrylamide, and the crosslinking agent is N, N-methylenebisacrylamide. Acrylamide: N, N-methylenebisacrylamide is 24:1. After weighing the organic monomer and crosslinking agent according to the weight ratio of 24:1, add deionized water to prepare organic monomer (including organic monomer and cross-linking agent) content of 12% monomer solution, and 2% non-ionic water-soluble polymer solvent polyacrylamide is added to the above monomer solution as an anti-oxidation and anti-coagulation agent. Weigh 50 grams of α-Si 3 N 4 Ceramic powder, α phase > 92%, average particle size 20um, adding 0.5 grams of alumina, 0.5 grams of magnesium oxide and 1.0 grams of yttrium oxide as sintering aids. Add 40ml of the prepared monomer solution to the uniformly mixed solid phase powder, and the volume fraction of the solid phase in the prepared suspension slurry is about 56%. Then add 1.5 ml of dispersant tetrame...

Embodiment 2～ Embodiment 6

[0033] Table 1 shows other five more preferred specific embodiments of the present invention, and its process flow and steps are exactly the same as those in Example 1. See Table 1 for specific material components, proportioning and process parameters.

[0034] Table I

[0035]

[0036]

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Abstract

The invention relates to a gelatin injection molding-shaping method for preparing silicon nitride ceramics heating elements, pertains to the technical field of inorganic material composition and preparation, and is characterized in that the following steps are included: a monomer solution containing an organic monomer and a cross linker is confected, silicon nitride ceramics powder and 4-39% of sintering addition agent are added for preparing suspensoid slurry, and dispersing agent which accounts for 1-3% of the mass of solid-phase powder material is added; the pH value is adjusted to 9-11; the suspensoid slurry is ball-milled for 4-8 hours, and the ceramics slurry with 55-60% of solid phase volume content and 0.7-0.9 Pa.s of viscosity is obtained; 20-50% of initiator and 10-30% of catalyst are added and stirring is carried out in vacuum for 5-15 minutes to remove bubbles; then injection mold, solidification and dryness are carried out; finally the blanker is sintered in a microwave oven at 1550-1800 DEG C. The ceramics blanker obtained by the invention has even structure, the operation is simple, and the production cost is low.

Description

Technical field: [0001] The invention relates to a gel injection molding process for preparing a silicon nitride ceramic heating element, which belongs to the technical field of synthesis and preparation of inorganic materials, and is especially aimed at a ceramic heating element with a complex shape and strict requirements on near-net size. Background technique: [0002] The silicon nitride heating element is to place a heating wire in the silicon nitride material, and after forming according to the requirements of use, the silicon nitride material is fully densified by high-temperature sintering or hot-pressing sintering process. Due to the excellent insulation performance and good thermal conductivity of silicon nitride, the heating element has reliable safety and automatic descaling performance. However, in the prior art of ceramic sintering involved in the present invention, machining of ceramic materials after sintering is very difficult, and the production cost is als...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/584B28B1/08
Inventor 郜长福张大牛宋文杰刘培祥
Owner SHENZHEN JINKE SPECIAL MATERIALS CO LTD
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