Preparation method of high-strength aluminum oxide ceramic substrate

By constructing a nano-magnesium oxide active layer in situ on the surface of alumina powder and combining it with rare earth metal oxides in a segmented sintering process, the problems of uneven additive dispersion and synergistic effect of alumina ceramic substrates were solved, and the preparation of alumina ceramic substrates with high strength and high density was achieved, which are suitable for high-end electronic components and high-temperature structural parts.

CN121651886APending Publication Date: 2026-03-13HEBEI HUICI ELECTRONIC TECHNOLOGY CO LTD
5 Cites 2 Cited by

Patent Information

Application Number
CN202610001058.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-04
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve ultra-uniform dispersion and synergistic effects of additives in alumina ceramic substrates, resulting in insufficient improvement in mechanical properties, narrow process windows, and large performance fluctuations, making it difficult to meet the stringent requirements of high-end applications.

Method used

A nano-magnesium oxide active coating layer was constructed in situ on the surface of alumina powder using a liquid phase method. This layer was then ball-milled together with rare earth metal oxides and metal oxides. A composite reinforced microstructure was formed through a segmented sintering process, including high-temperature pre-activation, medium-temperature control, and target-temperature refining. This process achieved ultra-uniform distribution and optimal interfacial bonding of nano-magnesium oxide and exogenous sintering aids.

Benefits of technology

It significantly improves the density and mechanical strength of alumina ceramics, forming a composite structure of "fine-grained matrix + ordered laminated plate-like crystals", thereby increasing the bending strength and bulk density of the material, making it suitable for large-scale production.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a preparation method of a high-strength aluminum oxide ceramic substrate, which comprises the following steps: firstly, modifying aluminum oxide powder by a liquid phase method, and coating a layer of nano magnesium oxide on the surface of the aluminum oxide powder; then carrying out ball milling treatment on the modified powder, rare earth metal oxide, metal oxide, an organic solvent, a binder, a plasticizer and a dispersing agent together, then carrying out defoaming, tape casting, drying and laminated hot pressing to obtain a ceramic green body, and finally carrying out sintering molding in an air atmosphere to obtain the ceramic. The nano magnesium oxide active coating layer constructed in situ and the added exogenous sintering aid act together, so that uniform growth of isometric crystals is promoted, development of a small amount of dominant oriented grains is directionally induced, a composite enhanced microstructure is formed, atomic scale super-uniform distribution and optimal interface combination of the nano magnesium oxide and the exogenous sintering aid are realized, and the nano magnesium oxide / exogenous sintering aid composite material is prepared. The bending strength of the obtained alumina ceramic can reach up to 881 MPa.
Need to check novelty before this filing date? Find Prior Art