Calcium titanate-aluminum titanate composite ceramic and preparation method thereof

Abstract

The invention relates to calcium titanate-aluminum titanate composite ceramic and a preparation method thereof. The preparation method is characterized by comprising the following steps: carrying outthermal insulation on calcium titanate frit under the condition of 1400 to 1450 DEG C for 3 to 4 hours, cooling and grinding to obtain calcium titanate powder; burdening according to the mass ratio ofthe calcium titanate powder to alpha-alumina powder to cerium oxide powder being 1 to (0.10 to 0.15) to (0.01 to 0.03), mixing, levigating and carrying out ball-milling to obtain a mixture I; carrying out thermal insulation on the mixture I under the condition of 1400 to 1450 DEG C, cooling and grinding to obtain a mixture II; burdening according to the mass ratio of the mixture II to polyvinyl alcohol being 1 to (0.01 to 0.03), mixing, carrying out mechanical pressing under the condition of 140 to 170 MPa, carrying out thermal insulation under the condition of 1400 to 1450 DEG C for 1 to 3 hours and cooling to obtain the calcium titanate-aluminum titanate composite ceramic. The preparation method disclosed by the invention has the characteristics of comprehensive utilization of resources, energy conservation and environmental protection; the prepared calcium titanate-aluminum titanate composite ceramic has the advantages of small thermal expansion coefficient, low thermal conductivity and greater flexural strength.

Description

technical field [0001] The invention belongs to the technical field of multiphase ceramics. In particular, it relates to a calcium aluminum titanate-aluminum titanate composite ceramic and a preparation method thereof. Background technique [0002] Aluminum titanate is Al 2 o 3 -TiO 2 The only compound in the binary system, it is also a ceramic structural material with the best high temperature resistance among known low expansion materials, with high melting point, low thermal expansion coefficient, low thermal conductivity and good thermal shock resistance; in addition, Aluminum titanate can be used under severe rapid cooling and rapid heating conditions, and has excellent corrosion resistance and alkali resistance to molten steel, steel slag, copper liquid, copper slag, aluminum liquid, etc. Calcium aluminate titanate is a 6 and Ca((Al 0.84 Ti 0.16 ) 2 ) 6 o 19 It is a multi-phase refractory material with the main crystal phase, and during the heating process, t...

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Problems solved by technology

[0003] "A new type of aluminum titanate composite ceramic" (CN104045342A) patent technology, using corundum, aluminum titanate, fluorite, titanium dioxide, serpentine, talc, stone powder, etc. as raw materials to prepare aluminum titanate composite ceramics, the raw materials used There are many types, and the reaction between raw materials is inconvenient to control, and the impurities introduced by the raw materials have an adverse effect on the thermomechanical properties of the composite ceramics; Isocyanurate, rubber, fly ash, aluminum titanate, corundum, conch shell powder, sodium chromium pyroxene, etc. are used as raw materials to prepare low-expansion composite ceramic materials, although by introducing chromium oxide into the aluminum titanate matrix material Such as the second phase particles hinder the expansion of cracks, thereby improving the thermal shock resistance of the material, but there are many kinds of raw materials, and the impurities introduced by the raw materials are high, which is not conducive to the improvement of the mechanical strength of the material