A preparation method of large-scale reaction sintered silicon carbide ceramic plate

Abstract

A method for preparing a large-size reaction-sintered silicon carbide ceramic plate. According to the ratio of parts by mass, 60-85 parts of silicon carbide, 5-10 parts of graphite powder, 2-5 parts of carbon black and 2-4 parts of Auxiliary, after stirring evenly, add 5-15 parts of water to continue stirring evenly, and then stale to obtain mud material; after the mud material is smelted, it is extruded by an extruder to obtain a green billet; after drying, it is sintered to obtain silicon carbide ceramics sheet. Adopting the standing furnace charging method can effectively reduce a large number of cracks, and overcome the shrinkage cracks in the prior art during drying. The invention can prepare large-scale silicon carbide ceramic plates in large batches, and overcomes the problems in the processes of forming, drying and sintering in the prior art while ensuring the flatness thereof.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramic materials, and relates to a method for preparing a large-size reactive silicon carbide ceramic plate. Background technique [0002] With the continuous expansion of the application of silicon carbide ceramics, there are more and more requirements for the quality and size of silicon carbide ceramics. Among them, large-scale (3500*500*10-30mm) silicon carbide ceramic plates (including hollow plates) have not been mass-produced and have encountered many difficulties. [0003] 1. Selection of molding method: 1) Dry pressing molding has relatively limited size of the press, especially its high pressure requirements, so its production investment is too large, the pass rate is low, and because of its molding method, it cannot be manufactured. Silicon hollow sheet. 2) Grouting molding: the uniformity is difficult to guarantee, and the density of the same section varies greatly during the...

AI Technical Summary

Problems solved by technology

Among them, large-scale (3500*500*10~30mm) silicon carbide ceramic plates (including hollow plates) have not been mass-produced and encountered many difficulties

[0003] 1. Selection of molding method: 1) Dry pressing molding has relatively limited size of the press, especially its high pressure requirements, so its production investment is too large, the pass rate is low, and because of its molding method, it cannot be manufactured. Silicon hollow sheet

2) Grouting molding: the uniformity is difficult to guarantee, and the density of the same section varies greatly during the drying process

3) Extrusion molding: It has no limitation on the size in the length direction, but it will cause a large number of tiny cracks due to excessive length shrinkage during the shrinkage process

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