Preparation method of foamed ceramic material with density gradient

A technology of foamed ceramics and density gradients, applied in glass manufacturing equipment, manufacturing tools, glass molding, etc., can solve the problems of low flexural strength, fracture, high scrap rate, etc., achieve high flexural strength, reduce fracture, improve The effect of intensity

Pending Publication Date: 2020-11-03
洛南县恒丰非金属矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in the application process: no matter it is used for external wall insulation, lightweight partition wall, self-insulation wall or roof insulation, when the size is large, due to the low flexural strength, it often leads to fracture during the construction process. Cause high scrap rate, affect the construction progress and the wide application of this type of product

Method used

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  • Preparation method of foamed ceramic material with density gradient
  • Preparation method of foamed ceramic material with density gradient
  • Preparation method of foamed ceramic material with density gradient

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specific Embodiment approach

[0029] The present invention is based on the potash feldspar-clay raw material system to prepare the foamed ceramic raw material ratio and firing temperature on the basis of its strength, porosity and thermal conductivity, and adopts the following three approaches: (1) in the cloth When selecting granulated materials with different proportions in the thickness direction and choosing the same firing temperature, the foamed glass-ceramic wall materials with different porosity, strength and thermal conductivity can be obtained. (2) When fabricating, select granulated materials with the same composition in the thickness direction, and set a temperature gradient in the height direction during firing to obtain foamed glass-ceramic walls with different porosity, strength and thermal conductivity from top to bottom. Material. (3) When fabricating, select granulated materials with different compositions in the thickness direction, and set a temperature gradient in the thickness directi...

Embodiment 1

[0047] 180-mesh potassium feldspar and 180-mesh clay were mixed in a weight ratio of 70:28 and 80:18 with 2 wt% 325-mesh silicon carbide for 2 hours using a ball mill. Use a disc granulator to granulate and granulate. After drying at 110° C. for 8 hours, use sieving to granulate balls with a diameter of 1 to 3 mm. Use mullite-cordierite as kiln furniture to build a 450×450mm space, then lay alumina fiber paper, and then lay 2cm thick potassium feldspar:clay:silicon carbide=80:18:2 granulation balls on the upper layer Lay 1cm thick potassium feldspar:clay:silicon carbide=70:28:2 granulation balls. The sample was fired in an oxidizing atmosphere in a resistance furnace at a firing temperature of 1260°C and kept for 4 hours, then cooled to 40°C with the furnace and released from the furnace to obtain a sample thickness of 5.6 cm. The properties of the sample are shown in Table 1.

[0048] Table 1 Properties of foamed glass-ceramic materials

[0049]

Embodiment 2

[0051] 180-mesh potassium feldspar and 180-mesh clay were mixed in a weight ratio of 60:38 and 70:28 with 2 wt% 325-mesh silicon carbide for 2 hours using a ball mill. Use a disc granulator to granulate and granulate. After drying at 110° C. for 8 hours, use sieving to granulate balls with a diameter of 1 to 3 mm. Using mullite-cordierite as kiln furniture, build a 450×450mm space, then lay alumina fiber paper, and then lay 2cm thick shale:clay:silicon carbide=70:28:2 granulation balls on the upper layer Put 1cm thick shale:clay:silicon carbide=60:38:2 granulation balls. The sample was fired in an oxidative atmosphere in a resistance furnace at a firing temperature of 1260°C, kept for 4 hours, then cooled to 40°C with the furnace and released from the furnace to obtain a sample thickness of 6.3cm. The properties of the sample are shown in Table 2.

[0052] Table 2 Properties of foamed glass-ceramic materials

[0053]

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Abstract

The invention discloses a preparation method of a foamed ceramic material with density gradient, which comprises the following steps: preparing potassium feldspar and clay as main raw materials, adding the raw materials into a ball mill, proportionally adding a high-temperature foaming agent, and uniformly mixing the foaming agent with the main raw materials to form a mixture; then adding the mixture into a disc pelletizer to be subjected to water spraying pelletizing to form pelletized balls; putting the pelletized balls into a drying oven for drying; screening the dried granulation balls toobtain uniform granulation balls; distributing and firing the screened granulated balls in kiln furniture; and cutting the fired material according to the thickness to obtain the foamed glass ceramicwith the density gradient. The foamed ceramic with density gradient is prepared through material composition design and sintering process temperature field design; on one hand, preparation of a thickplate can be achieved, and on the other hand, by controlling ingredient composition and temperature distribution in the thickness direction, the strength is improved, and plate breaking in the construction process is reduced under the condition that the heat preservation requirement is met.

Description

technical field [0001] The invention relates to the technical field of light wall material production, in particular to a preparation method of a foamed ceramic material with a density gradient. Background technique [0002] Building energy consumption has accounted for more than 30% of the country's energy consumption. By improving the thermal performance of the building envelope and using thermal insulation materials properly, the outdoor heat can be reduced indoors in summer, and the indoor heat loss can be reduced in winter. The loss can improve the thermal environment of the building, thereby reducing the cooling and heating consumption of the building. [0003] Thermal insulation materials mainly include inorganic materials and organic materials. Inorganic materials mainly include asbestos, airgel, foamed ceramics, etc., and organic materials include polyurethane foam and expanded polystyrene. Among them, the foamed ceramic lightweight wall material has excellent prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C11/00C03C10/00C03C6/02C03B19/08C03B19/06
CPCC03C11/007C03C10/00C03C1/00C03B19/08C03B19/06
Inventor 陈飞鹏尹洪峰闫耀锋李强
Owner 洛南县恒丰非金属矿业有限公司
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