Gel-casting moulding technique for preparing silicon nitride ceramics heating element
2007
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.
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