Rapidly synthesized polishing-free cordierite ceramic sheet for microwave oven and production method thereof

Abstract

Provided are a rapidly synthesized polishing-free cordierite ceramic sheet for a microwave oven and a production method of the rapidly synthesized polishing-free cordierite ceramic sheet. The production method comprises the following steps: basic materials including 35-55% of mullite, 15-35% of attaclay, 10-25% of black soil, 0-10% of cordierite, 0-10% of petalite, 0-5% of kaolin, 0-2% of calcium carbonate, 0-2% of potassium feldspar and 0-10% of Al2O3 are prepared according to weight ratio, the additives are polyvinyl alcohol (PVA) and sodium humate, the above all powdery basic materials are subjected to ball-milling to be crushed, the two additives are added into the basic material and are subjected to proper ball-milling to be fully mixed, then the basic materials and the additives are screened through a screen with 200-400 meshes, the iron in the basic materials and the additives is attracted, then the basic materials and the additives are sprayed with mist, dried to make powder, mechanical pressed, applied with glaze, and rapidly sintered at the intermediate temperature of 1220-1300 DEG C to make the product. According to the invention, the raw ores of mullite and attaclay are used to make the sheet, so that the cost of raw materials is greatly lowered, the glaze can be co-fired at one time, and the cordierite crystalline phase is rapidly synthesized by taking advantages of lattice imperfection of various raw mineral materials. The sheet can be pressed very thin and flat so as to avoid polishing.

Description

technical field [0001] The invention relates to the field of microwave dielectric ceramic materials of special ceramic materials, in particular to a rapid synthesis cordierite throw-free ceramic thin plate for microwave ovens and a manufacturing method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials with excellent dielectric properties in the microwave frequency range of 300MHz to 300GHz, which have been widely used in industry and military, and are used in modern communications, mobile phones, microwave oven load boards, etc. , is an emerging special ceramic material in China. [0003] At present, the microwave oven carrier plate has changed from the rotary table type to the fixed type. This method can save the power consumption of the rotary table drive motor and the drive motor, reduce the volume of the microwave oven cavity, and reduce the consumption of production materials. At present, the carrier board of domestic micro...

AI Technical Summary

Problems solved by technology

However, the ionic structure of the cordierite material is not compact enough, and there are large gaps in the lattice, so the material is difficult to sinter, and the firing temperature range is narrow. Cordierite-based microwave oven ceramic carrier plate is mainly made of cordierite clinker as the main raw material. The blank glaze is fired in two times, and the firing cycle of the blank is long; the original raw material is relatively dry and hard, requiring 800 tons. The pressure (272X272mm) can only be pressed to a thickness of 4.5-4.7mm, and it needs to be polished to achieve a certain thickness and flatness; it needs to be glazed and fired after the thick plate is polished and polished, so it is necessary to purchase a large amount of cordierite clinker However, the cost of raw materials is high, the glaze is fired twice, which makes the cost of gas occupy a large part, and the firing cycle of the green body is too long, which reduces the production efficiency. Big

However, the existing technology cannot be co-fired and the cycle cannot be shortened, which makes it difficult for such enterprises