Alumina-based insulator and low-temperature sintering method thereof

Abstract

The invention discloses an alumina-based insulator and a low-temperature sintering method thereof. The sintering temperature of the alumina-based insulator is lower than 1100 DEG C, the volume resistivity is not lower than 5*10<13> ohm cm, the dielectric strength is not lower than 500 kV / cm, the heat conductivity is not less than 30 W / m K, the bending strength is not lower than 400 Mpa, the Young's modulus is not lower than 300 Gpa, and the fracture toughness is not lower than 10 Mpa. The alumina-based insulator is prepared through the following steps: preparing nano alumina powder through a specific sol-gel technology and then adding various functional agents and sintering aids for high-pressure low-temperature sintering. According to the alumina-based insulator disclosed by the invention, the preparation temperature is low, the mechanical performance and the electric performance are excellent, the economical performance is good, the structure is dense, and the alumina-based insulator is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to an alumina-based insulator and a low-temperature sintering method thereof. Background technique [0002] Insulators are special insulation controls that can play an important role in overhead transmission lines. [0003] In the early years, insulators were mostly used on utility poles, and gradually developed into high-voltage wire connection towers where many disc-shaped insulators were hung at one end. It was used to increase the creepage distance, usually made of glass or ceramics, and was called an insulator. Insulators play two basic roles in overhead transmission lines, namely supporting wires and preventing current from returning to the ground. These two roles must be guaranteed; at the same time, insulators should have sufficient electrical insulation strength, moisture resistance and high temperature resistance. [0004] Among the relevant patents that have been app...

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Problems solved by technology

[0004] Among the relevant patents that have been applied in China, the patent "Alumina Low-Temperature Powder and Multifunctional Alumina Ceramic Radiator and Its Manufacturing Method" (application number: 201210519262.X, publication date: 2013-04-03) discloses a A method for preparing multifunctional alumina ceramics, but due to the commercially available nano-alumina powder, the particle size is large and the specific surface area is small, and the sintering temperature is still relatively high due to the single and backward sintering aids added and the sintering method (1380°C-1450°C), and because only the sintering step is very complicated, the economy is poor. On the other hand, because the organic matter is added to the mixed material for granulation, and then the organic matter is evaporated by sintering, so that the final ceramic The compactness is poor; the patent "A method for preparing wear-resistant microcrystalline alumina ceramics at low temperature" (application number: 201310289270.4, publication date: 2013-10-09 ) discloses a low-temperature preparation of wear-resistant microcrystalline alumina ceramics method, but it adopts the mechanical ball milling method to prepare alumina powder. The powder prepared by this method has a large particle size and a large size dispersion, and the internal stress is uneven and the powder activity is low. It is not suitable for large-scale industrial production. , and the mechanical and electrical properties of the produced ceramic body are generally superior (brittle, easy to break down, not resistant to corrosion), and the structure is not dense