High-temperature-resistant lightweight heat-insulating material with dual pore structure and preparation method thereof

A heat-insulating material and high-temperature-resistant technology, which is applied in home appliances, manufacturing tools, ceramic products, etc., can solve problems such as energy-saving effect, poor thermal shock resistance, poor high-temperature creep resistance, and large volume heat capacity, so as to improve strength and Effects of high temperature creep resistance, thermal conductivity reduction, and thermal shock resistance improvement

Active Publication Date: 2016-12-14
NANJING WEINENG KILN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dense refractories have better strength and high temperature creep resistance, but have large volumetric heat capacity, high thermal conductivity, poor energy saving effect and thermal shock resistance; porous refractory materials have good energy saving effect and thermal shock resistance, but the strength Low, poor high temperature creep resistance

Method used

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  • High-temperature-resistant lightweight heat-insulating material with dual pore structure and preparation method thereof
  • High-temperature-resistant lightweight heat-insulating material with dual pore structure and preparation method thereof
  • High-temperature-resistant lightweight heat-insulating material with dual pore structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this example, the mass ratio of alumina, silica, fused mullite, andalusite and Suzhou soil powder is 54:2:30:10:4. The mass ratio of raw material to activated carbon pore former is 100:1.5. The Al / Si ratio of the raw materials in this example is 6.0:1, and the properties of the samples are listed in Table 1. Its bulk density is 1.10, its flexural strength is 12MPa, its thermal conductivity is 0.85W / m K (perpendicular to the through hole) and 2.00W / m K (parallel to the through hole), and its volumetric heat capacity is 59kJ / K m 3 , the creep index is 1.65, and the thermal shock resistance index is 65. The sample in this example uses a standard brick mold during extrusion molding to extrude a green body with width × thickness = 137mm × 78mm, and cut it into a standard brick green body with a length of 277mm. After firing, the length × width × thickness = Standard brick sample of 230mm×114mm×65mm, as attached image 3 shown.

Embodiment 2

[0050] In this example, the mass ratio of alumina, silica, fused mullite, andalusite and Suzhou soil powder is 42:2:30:20:6. The mass ratio of the total raw material to the activated carbon pore-forming agent is 100:1.5. In this example, the raw material Al / Si ratio is 4.2:1. The properties of the samples are listed in Table 1. Its bulk density is 0.95, its flexural strength is 9.8MPa, its thermal conductivity is 0.78W / m·K (perpendicular to the through hole) and 1.88W / m·K (parallel to the through hole), and its volumetric heat capacity is 52kJ / K· m 3 , the creep index is 2.64, and the thermal shock resistance index is 70. The sample in this example uses a flat die during extrusion molding to extrude a green body with width×thickness=578mm×90mm, and cut it into a flat green body with a length of 963mm, and obtain length×width×thickness=800mm after firing ×480mm×75mm flat sample, as attached Figure 4 shown.

Embodiment 3

[0052] In this example, the mass ratio of alumina, silica, fused mullite, kyanite, and Suzhou soil powder raw materials is 66:2:30:20:2. The mass ratio of raw material to activated carbon pore former is 100:1.5. In this example, kyanite is used instead of mullite and andalusite as the main source of silica, and the amount of alumina is more than that in Examples 1 and 2, and the Al / Si ratio in the raw material is 6.8:1. The properties of the samples are listed in Table 1.

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Abstract

The invention discloses a high-temperature-resistant lightweight heat-insulating material with a dual pore structure and a preparation method thereof. The preparation method comprises the following steps: with alumina, silica and aluminosilicate powder as raw materials, adding a molding aid and a pore forming agent into the raw materials and carrying out uniform mixing under stirring; and then subjecting a mixture obtained in the previous step to extrusion molding and then to sintering so as to obtain the high-temperature-resistant lightweight heat-insulating material with the dual pore structure composed of macroscopic through hole channels and micropores, wherein a ratio of the total volume of through holes to the total volume of the micropores is 0.5-25: 1. According to the invention, through synergism of proper volumes of a micropore structure and the macroscopic through hole channels, the prepared material has improved energy conservation effect and thermal shock resistance, and substantially enhanced strength and high-temperature creep resistance while high temperature performance of the material is guaranteed.

Description

technical field [0001] The invention belongs to the field of material technology, and specifically relates to a high-temperature-resistant lightweight heat-insulating material with a double-pore structure for high-temperature equipment and a preparation method thereof. The preparation technology of high-temperature-resistant lightweight heat-insulating materials with a double-pore structure of through-holes and micro-pores, the volume ratio of macro-through-holes and micro-pores is controlled within an appropriate range, which can ensure that the double-pore structure can fully exert the synergistic effect. Background technique [0002] Refractory materials are widely used in various high-temperature equipment such as industrial kilns and reaction furnaces, and are often used as the basic structural components of high-temperature equipment in the form of standard bricks or prefabricated parts. According to different use temperature and functions, it can be basically divided ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/66C04B35/101
CPCC04B35/101C04B38/08C04B2235/349C04B2235/3418C04B2235/3463C04B2235/96C04B2235/6021C04B2235/6562C04B35/117C04B35/18C04B2235/9607C04B35/62665C04B2235/3217C04B2235/95C04B35/185C04B35/632C04B35/63416C04B35/6342C04B35/63408C04B35/63436C04B35/6365C04B38/02B28B3/269C04B35/00C04B38/0054C04B38/0064C04B38/0074B28B3/20B28B11/243B28B2003/203C04B35/10C04B35/64C04B38/0009C04B38/068C04B35/66
Inventor 郭露村耿龙兴陈涵
Owner NANJING WEINENG KILN TECH
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