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MgO-Al2O3-ZnO-based high-temperature high-emissivity filler and preparation method thereof

A high-emissivity, al2o3 technology, applied in the field of infrared radiation filler preparation, can solve the problems of low average emissivity, harmful heavy metals, low temperature resistance, etc., and achieves simple and easy preparation process, cheap raw materials, good thermal shock performance effect

Inactive Publication Date: 2018-11-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main components of the filler are MgO, Al 2 o 3 , SiC, ZrO 2 and ZnO, among which MgO, Al 2 o 3 The spinel structure material formed by grinding the powder mixed with ZnO is used as the filler matrix; the filler is a high-temperature-resistant and high-emissivity filler applied to the inner wall of the boiler, which has the characteristics of energy saving and environmental protection, high comprehensive emissivity and high temperature resistance, and effectively solves the problem of It solves the problems of low temperature resistance, low average emissivity and harmful heavy metals of existing fillers

Method used

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  • MgO-Al2O3-ZnO-based high-temperature high-emissivity filler and preparation method thereof
  • MgO-Al2O3-ZnO-based high-temperature high-emissivity filler and preparation method thereof
  • MgO-Al2O3-ZnO-based high-temperature high-emissivity filler and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A high temperature resistant and high emissivity filler, in terms of mass percentage, containing SiC 10wt% and ZrO 2 10wt%, the rest is MgO, Al 2 O 3 And ZnO; among them, MgO, Al 2 O 3 The molar ratio with ZnO is 1:1:0.2.

[0038] The specific steps for preparing the high temperature resistant and high emissivity filler are as follows:

[0039] (1) Preparation of raw material mixed powder: According to the composition of filler powder (MgO, Al 2 O 3 The molar ratio of ZnO is 1:1:0.2, SiC and ZrO 2 Respectively account for 10wt% of the total mass of the powder), weigh the raw materials with an electronic balance, of which 1.1657g MgO and Al 2 O 3 2.9726g, ZnO 0.7431g, SiC 0.4882g and ZrO 2 0.4882g;

[0040] (2) Ball milling of raw material mixed powder: the weighed raw material is mixed powder, grinding ball (ZrO 2 Ball 9g) and deionized water (17g) are mixed according to the mass ratio of 1:1.5:3, put into the ball mill, and ball milled at 150r / min for 6h;

[0041] (3) Dryi...

Embodiment 2

[0047] A high temperature resistant and high emissivity filler, in terms of mass percentage, containing SiC 10wt% and ZrO 2 10wt%, the rest is MgO, Al 2 O 3 And ZnO; among them, MgO, Al 2 O 3 The molar ratio of ZnO is 1:1:0.8.

[0048] The specific steps for preparing the high temperature resistant and high emissivity filler are as follows:

[0049] (1) Preparation of raw material mixed powder: According to the composition of filler powder (MgO, Al 2 O 3 The molar ratio of ZnO is 1:1:0.8, SiC and ZrO 2 Respectively account for 10wt% of the total mass of the powder), weigh the raw materials with an electronic balance, of which 1.1657g MgO and Al 2 O 3 2.9726g, ZnO 2.9726g, SiC 2g and ZrO 2 2g;

[0050] (2) Ball milling of raw material mixed powder: the weighed raw material is mixed powder, grinding ball (ZrO 2 Ball 12g) and deionized water (48g) are mixed according to the mass ratio of 1:1:4, put into the ball mill, and ball milled at 200r / min for 6h;

[0051] (3) Drying of raw mat...

Embodiment 3

[0057] A high temperature resistant and high emissivity filler, in terms of mass percentage, containing 15wt% SiC and ZrO 2 15wt%, the rest is MgO, Al 2 O 3 And Fe 2 O 3 ; Among them, MgO, Al 2 O 3 The molar ratio of ZnO to ZnO is 1:1:1.

[0058] The specific steps for preparing the high temperature resistant and high emissivity filler are as follows:

[0059] (1) Preparation of raw material mixed powder: According to the composition of filler powder (MgO, Al 2 O 3 The molar ratio of ZnO is 1:1:1.3, SiC and ZrO 2 Respectively account for 15wt% of the total mass of the powder), weigh the raw materials with an electronic balance, of which 3.216g MgO and Al 2 O 3 4.1008g, ZnO8.6832g, SiC2g and ZrO 2 2g;

[0060] (2) Ball mill of raw material mixed powder: the weighed mixed powder, grinding ball (ZrO 2 Ball (40g) and deionized (80g) water are mixed according to the mass ratio of 1:2:4, put into the ball mill, and ball milled for 8h at a speed of 180r / min;

[0061] (3) Drying of raw ma...

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Abstract

The invention discloses MgO-Al2O3-ZnO-based high-temperature high-emissivity filler and a preparation method thereof. The filler is mainly formed by MgO, Al2O3, ZnO, SiC, and ZrO2, wherein a mole ratio of the MgO to the Al2O3 to the ZnO is 1:1:(0.2-1.5), the SiC is 10-20 wt% of a total weight, and the ZrO2 is 10-20 wt% of the total weight. The filler is the filler with high-temperature resistanceand high-emissivity which is applied to the inner wall of a boiler, has the characteristics of energy conservation and environment protection, high comprehensive emissivity and high-temperature resistance, and is capable of solving problems that current filler is low in high-temperature resistance, low in average emissivity and a harmful heavy metal exists. The high-temperature resistant high-emissivity filler prepared by using a solid phase method is simple in preparation method and easy to operate, and less in products harmful to the environment.

Description

Technical field [0001] The invention relates to the technical field of preparation of infrared radiation fillers, in particular to a MgO-Al applied to the inner wall of a boiler 2 O 3 -ZnO-based high temperature and high emissivity filler and preparation method thereof. Background technique [0002] As a new type of energy-saving material in industrial furnaces, infrared radiation fillers can receive good energy-saving effects when used in industrial furnaces; at the same time, it has a good protective effect on the boiler wall matrix and has a wide range of application prospects. The traditional infrared radiation coatings on the market have serious degradation of the infrared radiation performance of the filler with the increase of temperature, the service life is short, and the filler is prone to fall off. [0003] Since the 1960s, foreign countries have carried out research on high emissivity coatings. The developed Enecoat infrared radiation coatings, ET24 infrared radiation c...

Claims

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Application Information

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IPC IPC(8): C04B35/44
CPCC04B35/44C04B2235/3206C04B2235/3244C04B2235/3826C04B2235/6562C04B2235/6567C04B2235/96
Inventor 曾群郭园
Owner SOUTH CHINA NORMAL UNIVERSITY
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