Lightweight vitreous foamed ceramic

Abstract

The invention discloses improvement to lightweight vitreous foamed ceramics and is characterized in that: a lightweight vitreous foamed ceramic mainly comprises 50 to 95 wt % of ceramic walls, a floor tile grinding wet powder skeleton material, 5 to 50 wt % of china clay and/or talcum and/or bentonite and/or tremolite and/or saponite fine powder matrix material and 0 to 8 wt % of a foaming agent; the above-mentioned materials are mixed and sintered at a temperature equal to or above a vitrification point of the matrix material. According to the invention, composition and ratio are simplified, composing materials basically comprise only two materials, mutual influence between the materials is small, it is easy to control the process of manufacturing, and therefore, a preparation process has good stability and products of different batches have stable performance and good consistency; a main raw material is waste materials generated in the production of ceramics, and the raw material is easily available and enables preparation cost to be substantially reduced and primary minerals to be saved; tangent planes of a prepared product are basically of a uniform noncommunicating subtle enclosed foam structure, the prepared product has volume density (unit weight) of 0.35 to 0.48 g/cm<3>, compressive strength at normal temperature of 9.0 to 9.6 Mpa and a heat conduction coefficient at a temperature of 70 DEG C (on average) of 0.168 to 0.182 W(m.k), and the natural color of the product (without addition of pigments) is white and greenish and appears to be tattletale gray.

Description

technical field [0001] The invention is an improvement to light-weight vitrified foamed ceramics, in particular to a light-weight vitrified foamed ceramics with few types of ingredients, simple preparation, stable performance and good comprehensive performance. Background technique [0002] Lightweight vitrified foamed ceramics, due to their light weight, low thermal conductivity, low thermal expansion, good strength, and acid and alkali resistance, are used in a variety of non-contact flame insulation, such as building wall insulation and sound insulation, wet desulfurization Chimney lining anti-corrosion, sound-absorbing sound barriers and other occasions. Ideal lightweight vitrified foamed ceramic body, such as chimney lining anti-corrosion should have a low bulk density (minimum 500kg / m 3 ), low heat transfer coefficient (≤0.25-.035W (m k)), good vitrification (volume water absorption ≤5.0%) and high compressive strength (≥8.0-10.0Mpa), acid resistance (≥0.9 ). Existi...

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned patents use different formulas. Although light-weight ceramics or foamed vitrified ceramics can be obtained, one of the common shortcomings is that there are relatively many components, resulting in a greater interaction between each component, resulting in a greater impact on product perfo