High-temperature high-power rare earth resistance paste and preparation method thereof

Abstract

The invention discloses a high-temperature high-power rare earth resistance paste and a preparation method thereof. The high-temperature high-power rare earth resistance paste comprises a functional phase, an inorganic adhesive phase, a burning promoter and an organic carrier, wherein the functional phase is composite powder consisting of micrometer silver powder and bismuth ruthenate powder; the inorganic adhesive phase is lead-free pyroceram powder consisting of SiO2, MgO, B2O3, ZnO, Bi2O3, rare earth oxides and a nucleation agent; and the organic carrier is a mixture consisting of a solvent, resin, a dispersing agent, a deforming agent and a thixotropic agent. The resistance paste has the advantages that firstly, the damages of lead on the environment and human bodies can be avoided; secondly, the resistance paste is high in compatibility, wettability, thermal performance, electrical performance, manufacturability and adaptability; thirdly, the resistance paste is high in binding performance with ceramic and stainless steel substrates; and fourthly, the resistance paste is high in printing performance, burning performance and compatibility. The preparation method comprises preparation of the inorganic adhesive phase, preparation of the functional phase, preparation of the organic carrier and preparation of the resistance paste in sequence, and the resistance paste can be produced and prepared effectively.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to a high-temperature and high-power rare earth resistor slurry based on ceramic substrates and stainless steel substrates and a preparation method thereof. Background technique [0002] Electrothermal materials are materials that utilize the thermal effect of electric current. Metal electrothermal materials mainly include precious metals (Pt), high-temperature melting point metals (W, Mo, Ta, Nb) and their alloys, nickel-based alloys and iron-aluminum alloys. The most widely used metal electrothermal The materials are mainly nickel-chromium alloy and iron-aluminum alloy. Metal electric heating materials mainly include silicon carbide, lanthanum chromate, zirconia, molybdenum disilicide, etc. It has the advantages of high temperature resistance, corrosion resistance, oxidation resistance, and high electrothermal conversion efficiency, and is gradually replacing metal e...

AI Technical Summary

Problems solved by technology

Traditional electric heating sources are generally large in size, low in energy efficiency utilization, and inconvenient in application, making it difficult to meet the needs of modern industry and life

[0003] The use of thick film heating technology is gradually being promoted in China, but it can only be conducted and convected as the main heat transfer method, and the product performance stability is poor, and the temperature of the heating element itself is very high, so there are great limitations in the application range and base material selection.

[0004] As the core material of thick film heating technology, resistance paste plays a very important role in thick film heating technology; however, for the existing thick film resistance paste, it generally has the following defects, the specific scope: 1. Contains lead materials that cause harm to the human body and the environment; 2. Compatibility, wettability, thermal performance, electrical performance, processability, and adaptability are not strong; 3. Poor matching with ceramic substrates and stainless steel substrates; 4. , printing characteristics and firing characteristics are poor