Rare earth thick film circuit electrical heating element based on aluminum nitride minicrystal ceramic substrates and its preparation technique

Abstract

The invention provides a controllable electrical heating element of rare-earth thick-film circuit based on aluminum nitride microcrystal ceramic base plate and manufacturing method thereof, comprising base pieces and serial electronic sizing agents which are manufactured on the base pieces. The serial electronic sizing agents comprise package sizing agent and electronic sizing agent, and are all composed of three parts including a functional phase, an inorganic bonding phase and an organic carrier. The serial electronic sizing agents further comprise rare-earth resistance sizing agent. The base piece is ALN aluminum nitride microcrystal ceramic base piece. The serial electronic sizing agents are manufactured on the base piece by means of thick film circuit. The invention synchronously further provides formulations of ALN aluminum nitride microcrystal ceramic base piece, rare-earth envelopment sizing agent, rare-earth resistance sizing agent and rare-earth electrode sizing agent. The invention is environment-friendly, safe and reliable by providing with equal and controllable heating temperature field, large power, high power density, high efficiency of heat conduction, high speed of response, high efficiency for saving energy, strong capability of thermal-shock resistance, small volume and wide application range.

Description

Technical field [0001] The invention relates to the technical field of electric heating, and more specifically to an ALN ​​microcrystalline ceramic substrate, a rare earth electronic slurry, a thick film circuit controllable electric heating element and a preparation process thereof. Background technique [0002] In the sustainable development strategy established by our country, the two aspects involved are environmental protection and improvement of energy utilization, and improvement of energy structure. In the field of electric heating, the new type of heating element requires small volume, large power, large surface heat load, low thermal inertia, high thermal efficiency, low power consumption, fast thermal start, uniform temperature field, and heat conduction. Excellent performance, strong thermal shock resistance, no pollution, green, environmentally friendly, safe and reliable. [0003] When the high-efficiency electric heating elements of metal substrates and glass-ceram...

AI Technical Summary

Problems solved by technology

Therefore, among the various requirements for the substrate, the thermal conductivity becomes the leading index, and the thermal conductivity of the metal substrate and the glass-ceramic substrate is not the best. When the electric heating element operates at high power and high temperature, the low thermal conductivity will cause It may cause a drop in efficiency, especially when operating at 400-600°C, not only will it cause a drop in efficiency, but it will also cause an increase in design and manufacturing costs. Moreover, although the existing ALN aluminum nitride substrate has the best thermal conductivity, it cannot be used under high-power and high-temperature conditions. The performance is good, but the ALN material has poor toughness, low mechanical strength, and small specifications, so the scope of application is greatly limited.