Heat-proof purple sand ceramic mud and method for preparing the product

Abstract

The present invention provides one kind of heat resisting violet sand earthenware material and its product making process. The heat resisting violet sand earthenware material consists of Si2O 60-73 wt%, Al2O3 15-38 wt%, CaO 2-6 wt%, MgO 6-12 wt%, Fe2O3 0-5 wt%, K2O 0-2 wt%, and Li2O 0-5 wt%; and its raw materials include violet sand 40-60 wt%, black clay 20-30 wt%, white clay 10-25 wt%, talcum 10-18 wt%, and Chinese medicinal stone 5-10 wt%. The heat resisting violet sand earthenware material may be used in making different kinds of heating utensils with thermal expansion coefficient of (1-2)x10<-6> / deg.c, high heat stability and high heat shock resistance. In addition, the utensil made of the violet sand earthenware material may be used in cooking food with good look, good smell, good taste and excellent health function.

Description

technical field [0001] The invention relates to the field of ceramic materials and products thereof, in particular to a preparation method of heat-resistant purple sand ceramic mud and products thereof. Background technique [0002] The heat-resistant ceramics commonly used at present mainly include the talc-clay-feldspar ternary combination and the spodumene-kaolin-feldspar ternary combination. The disadvantage is that the thermal expansion coefficient of the product is relatively high, which is 4 respectively. ~6×10 -6 / ℃ and 3~4×10 -6 / °C, poor thermal shock resistance; high firing temperature, high energy consumption. In recent years, some companies have also been researching medium-temperature heat-resistant ceramics. For example, Chinese patent ZL200510035605.5 (notification number CN1298667C) discloses a medium-temperature heat-resistant ceramic and its preparation method. It is a binary formula composed of lithium petalite-kaolin , although the thermal stability h...

AI Technical Summary

Problems solved by technology

[0002] The heat-resistant ceramics commonly used at present mainly include the talc-clay-feldspar ternary combination and the spodumene-kaolin-feldspar ternary combination. The disadvantage is that the thermal expansion coefficient of the product is relatively high, which is 4 respectively. ~6×10 -6 / ℃ and 3~4×10 -6 / °C, poor thermal shock resistance; high firing temperature, high energy consumption

However, due to technical limitations, it cannot achieve the purpose of dry burning without cracking, but can only be used as a set of electrical appliances or steaming and stewing, and cannot be used directly on open flames, and the application field is limited.