Castorite/cordierite multi-phase low-buckling ceramic and preparation method thereof

Abstract

The invention relates to a petalite / cordierite multiphase low expansion ceramic and preparation method thereof. The invention is characterized in that: the invented low expansion ceramic with a main crystal phase of compound petalite and cordierite multiphase crystal structure is made from the following materials that are: petalite, kaolin and talc, and adopts common sintering method of ceramic. The heat expansion coefficient Alpha is 1.0-2.0 multiplied by 10-6 DEG C. The low expansion ceramic with good thermal stability can be made without using expensive lithium containing material such as spodumene and lithium carbonate. The invention can be broadly used in making kiln furniture, high temperature clamp, high temperature radiation baffle, homely heat-resistant tableware, and thermocouple protective tube, etc.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials (ceramics), and relates to petalite / cordierite composite ceramics with low expansion characteristics and a preparation method thereof. Background technique [0002] Low-expansion ceramics refer to thermal expansion coefficients less than 2.0×10 -6 / °C ceramics. Low expansion materials have been widely used in ceramics, metallurgy, enamel, special glass, chemical industry, etc., and lithium low expansion ceramics are favored due to their excellent high temperature resistance, thermal shock resistance and high temperature chemical stability. It is widely used in ceramic blanks, glazes, kiln furniture, induction heating parts (such as microwave oven gaskets), astronomical telescope mirror blanks, and heat-resistant tableware for household use. [0003] At present, the commonly used lithium-based low-expansion ceramics mainly use industrial lithium carbonate (Li 2 CO 3 ) and natural...

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Problems solved by technology

[0004] In addition, the main crystal phases of the most commonly used lithium-based low-expansion ceramic products at home and abroad are spodumene and petalite. There is no report that the main crystal phase is composite petalite / cordierite

As described in Chinese patent document 200510023142.0 "a high thermal shock resistance ceramic and its manufacturing method", the blank is made of calcined spodumene powder, high-quality kaolin, quartz and sintering accelerators such as titanium dioxide and zirconium dioxide to synthesize β- The main crystal phase of spodumene, although it has a low thermal expansion coefficient (-0.2-1.5×10 -6 ℃), but the amount of spodumene is as high as 35-55%, and chemical raw materials such as titanium dioxide and zirconium dioxide are added, and the cost is relatively high; and as disclosed in patent document 200510035605.5 "medium temperature heat-resistant ceramics and its manufacturing method", the ingredients Petalite feldspar, kaolin and lithium carbonate are used to synthesize petalite feldspar main crystal phase, wherein the amount of petalite feldspar is 42-70%, the amount of lithium carbonate is 0-8%, and its cost is obviously higher than this Invention patent, but its thermal expansion coefficient is high, reaching 2.0-3.0×10 -6 / °C

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