A high-emissivity infrared energy-saving material and its preparation method

Abstract

The invention belongs to the technical field of infrared energy saving, and relates to a high emissivity infrared energy saving material and a preparation method thereof. The high-emissivity infrared energy-saving material involved has a perovskite-structured lanthanum aluminate as the main phase, and the raw material of the high-emissivity infrared energy-saving material has lanthanum oxide, aluminum oxide, and a dopant used to prepare the main phase of the lanthanum aluminate Ⅰ and dopant Ⅱ; dopant Ⅰ is calcium oxide, dopant Ⅱ is chromium oxide; 0.1~0.2 moles of calcium ions are doped at the unit mole of lanthanum, and 0.1~0.2 moles of calcium ions are doped at the unit mole of aluminum Chromium ion; the raw material of high-emissivity infrared energy-saving materials also has zirconia; zirconia and calcium oxide undergo a solid-phase reaction to form the second main phase calcium zirconate, and suppress or reduce the low-melting phase (CaLa) through solid-state reaction Al 3 o 7 The generation of zirconium ions that react in solid phase with calcium ions in calcium oxide is provided by zirconia. The invention has the characteristics of high emissivity, high temperature resistance, high stability and high compatibility.

Description

technical field [0001] The invention belongs to the technical field of infrared energy saving, and more specifically relates to a high emissivity material and a preparation method thereof. Background technique [0002] In recent years, the rapid growth of energy consumption in my country has made the situation of energy conservation very severe. The industrial energy consumption for high-temperature processes represented by thermal furnaces accounts for about 25% to 40% of the national energy consumption. At the same time, the analysis of statistical data shows that At present, the average thermal efficiency of my country's thermal furnace equipment is less than 40%, which is 10% to 20% lower than that of industrially developed countries. Therefore, timely layout and research and development of energy-saving technologies for thermal equipment are extremely necessary and significant. In my country, aluminum-silicon refractories (Al 2 o 3 / SiO 2 , such as: alumina fiber bri...

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Problems solved by technology

[0002] In recent years, the rapid growth of energy consumption in my country has made the situation of energy conservation very severe. The industrial energy consumption for high-temperature processes represented by thermal furnaces accounts for about 25% to 40% of the national energy consumption. At the same time, the analysis of statistical data shows that At present, the average thermal efficiency of thermal furnace equipment in my country is less than 40%, which is 10% to 20% lower than that of industrially developed countries.

[0003] So far, in the research and development and application of infrared radiation energy-saving ceramic coatings, the American Wessex company is internationally recognized as the best performing company, but because its products are based on SiB 6 Main phase, resulting in long-term high prices

In addition, the British Encoat company's coating products have achieved an energy-saving efficiency of 5% in the trials of natural gas furnaces and oil furnaces, but due to the use of SiC powder as the radiation base material, they are not suitable for thermal furnaces with high-temperature oxidizing atmospheres

Invention patent "a nano-insulation coating" (patent application number: 201210554146.1) mainly uses nano-aluminum phosphate, nano-manganese oxide, nano-zirconia, nano-titanium carbide, nano-perlite, and nano-calcium silicate powder as raw materials. The prepared coating is only It can be used in normal temperature or medium and low temperature environment. In high temperature environment, these raw materials are easy to be sintered, and the crystal grows and loses the properties of nanomaterials.

The invention patent "an infrared energy-saving coating and its application" (patent application number: 201510119884.7) is based on lanthanum aluminate with a perovskite structure as the main phase, and its emissivity in the near infrared can reach above 0.9. With the increase of the content of calcium ions in the position (unit mole of lanthanum doped with calcium ions ≥ 0.2), there will be a low-melting phase (CaLa) Al in the system 3 o 7 formation, which affects its stability at high temperature and limits its application in high temperature conditions

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