Method for preparing ultralow expanding ceramic material

Abstract

The invention relates to a method for preparing an ultralow expanding ceramic material. The method comprises the following steps of: 1, preparing the following raw materials in part by weight: 60 to 80 parts of spodumene, 10 to 35 parts of aluminium oxide (Al2O3), 15 to 40 parts of silica (SiO2), 5 to 15 parts of kaolin, additive and 1.5 to 3 parts of polyvinyl alcohol (PVA); 2, performing ball-milling and crushing on all the powdered raw materials; 3, sieving, attracting iron, performing spray-drying to prepare powder, and performing machine moulding; and 4, sintering at high temperature andpreserving heat to prepare the ultralow expanding ceramic material. The ultralow expanding ceramic material is a white flaky material, uses spodumene particulate solid melt as a basic material and isdirectly synthesized according to a Li2O-Al2O3-SiO2 ternary system formula theory, wherein the water absorption of the product is less than 0.5 percent; rupture modulus is 50 to 80 MPa; thermal shockresistance is that the product is not cracked during one-step heat exchange at the temperature of between 720 and 20 DEG C according to a test by a strip sample test method (YB4018) in China; and thermal expansion coefficient is 0.9*10<-6> / DEG C at the temperature of between 20 and 850 DEG C. The process is simple; the process required by preparation of fritted glaze is saved; and energy consumption of production is reduced.

Description

technical field [0001] The invention relates to the field of special ceramic materials, namely a method for manufacturing ultra-low expansion ceramic materials. Background technique [0002] Ultra-low expansion ceramic materials are widely used in induction cooker panels, microwave oven linings, barbecue heating plates, high-temperature radiation baffles, electronic components, refractory materials, etc. Because of its extremely low coefficient of thermal expansion, it has good thermal shock resistance. The invention is an ultra-low expansion ceramic material, which is used to manufacture a barbecue heating plate. At present, at home and abroad, natural lithium materials or artificial synthetic materials with small thermal expansion coefficients are basically used as the main raw materials to manufacture ultra-low expansion ceramics. The theory is Li 2 O-Al 2 0 3 -Si0 2 Ternary system formula. The current low-expansion ceramics and their manufacturing methods have the ...

AI Technical Summary

Problems solved by technology

The current low-expansion ceramics and their manufacturing methods have the disadvantages of strict particle size conditions, narrow firing temperature range, complex process, high cost, insufficient performance and insufficient stability, especially during firing. Cracking and many other difficult problems

For example: In the invention patent with the application number 200910115236.9 published on September 23, 2009, it is believed that: "Currently, it is difficult to prepare ultra-low expansion ceramic materials directly by the preparation process of the whole raw material formula for lithium-based low-expansion ceramic materials, that is, The coefficient of thermal expansion is less than 1.0×10 -6 / °C Ceramics”

"The first step is to proportion by weight, and the second step is to melt into a glass frit as material A...", the melting temperature reaches 1450°C, and the fuel consumption is high