Low-temperature sintering high-heat conduction ceramic paint suitable for metal base material and preparation method and application thereof

Abstract

The invention discloses a low-temperature sintering high-heat conduction ceramic paint suitable for metal base material and a preparation method and an application thereof. The paint comprises the following raw materials: low-temperature molten glass powder, iron oxide red, copper-chrome black, cerium dioxide, boron nitride, iolite micro powder, alumina micro powder, chromium sesquioxide micro powder, 20-50% of silicon aluminium sol, 0.5-3% of an auxiliary agent, and the balance of water. The method comprises the following steps: a metal matrix is processed, then the surface of the metal matrix is uniformly coated with a paint and dried in shade; and the coated metal matrix is heated at the temperature of 650-900 DEG C to form the low-temperature sintering high-heat conduction ceramic paint. The paint has the advantages of easy acquisition of the raw materials and low cost, is tightly combined with the metal matrix, has effective high temperature oxidation resistance, acid corrosion resistance and abrasion resisting effects of a heating furnace flue heat exchanger on a metal heat exchanger, ceramic coating surface is smooth and clean, slag buildup of the heat exchanger is effectively reduced, the service life of the metal heat exchanger is prolonged, and the heat exchange efficiency effect is increased.

Description

technical field [0001] The invention relates to the technical field of ceramic coatings, in particular to a low-temperature sintered high thermal conductivity ceramic coating suitable for metal substrates and its preparation method and application. Background technique [0002] The heat exchanger is one of the main equipments commonly used to improve energy utilization in iron and steel, chemical industry, oil refining, food, light industry, energy, pharmaceuticals, machinery and many other industrial sectors. The environment is relatively complex, such as high temperature environment, acid environment, dusty gas environment, etc. Therefore, problems such as high temperature oxidation, acid corrosion, wear, perforation, and dust accumulation will inevitably occur during use, which seriously affects the use of heat exchangers. efficiency and longevity. [0003] In view of the above problems, there are two main solutions: one is to use high temperature resistant and corrosion...

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Problems solved by technology

At present, the research on anti-corrosion coatings for heat exchangers mainly focuses on the organic high-temperature anti-corrosion coatings used in low-temperature heat exchangers in petrochemical and other fields (the operating temperature is lower than 350°C). There are relatively few researches on ceramic coatings for heaters

The reported metal-based ceramic coatings are mainly applied to the hot surfaces of various industrial boilers, mainly to improve the efficiency of infrared radiation, reduce contamination and slagging, and enhance anti-oxidation and wear resistance. For example, "a kind of anti-staining Dirty slagging ceramic coating and its preparation method (patent application number 201510666902.3), "a high-temperature-resistant, oxidation-resistant, high-emissivity coating and its user (patent application number 201510668003.7), "a coating suitable for metal and non-metal substrates High emissivity and high emissivity (patent application number 201310131435.5)", etc., the formation temperature of ceramic coatings is mostly higher than 1000 ° C, for metal heat exchangers with operating temperatures in the range of 650-900 ° C, it is impossible to form dense ceramic coatings, And because the thermal conductivity is small, it will often affect the heat transfer performance of the heat exchanger, so it is necessary to develop a low-temperature sintered high thermal conductivity ceramic coating suitable for metal substrates and its preparation method

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