Surface alloying ceramic and its preparing process

Abstract

This invention discloses a surface alloying ceramics and its preparation method. It relates to fields of improving technology of ceramics surface and composite material preparation. The features are that common ceramics are surface alloyed in arc glowing furnace by using composite target designed by this invention method. The target is pro rate mechanic consisted by one kind or several kinds of titanium (or zirconium, hafnium) and other metal materials (such as iron, chromium, nickel, manganese, molybdenum, copper, aluminum, argentums). The target evaporates or melts under the action of the arc heat and the ceramics surface is impacted by metal ions in high speed under the action of high electric field. The advantage is that the cementation speed is fast, the bond strength is high, and the thickness of alloy layer can reach more than 100 mu m. The preparations of several kinds of surface alloying ceramics and sill like composite material can be realized by this method.

Description

1. Technical field [0001] Surface alloyed ceramics and preparation method of the present invention relate to ceramic surface modification technology and preparation of composite materials [0002] technology field. 2. Background technology [0003] Ceramic materials have many advantages, such as high temperature resistance, corrosion resistance, high hardness, wear resistance, and good electrical insulation. Therefore, ceramic materials have been widely used. However, due to the inevitable disadvantages of ceramics, such as brittleness, strength dispersion and poor processability, the further use of ceramics is limited. Alloying the surface of ceramics to form surface alloyed ceramics is the main way to maximize the strengths and avoid weaknesses to expand the application of ceramics. Therefore, surface alloyed ceramics have broad application prospects. [0004] The biggest difficulty in metallizing ceramic surfaces is that the bonding mechanism of ceramic materials and m...

AI Technical Summary

Problems solved by technology

The Mn-Mo method is to sinter Mn and Mo powder materials on the ceramic surface during the complex sintering process. This metallization process reduces the surface finish and performance of the ceramics; the vapor deposition metallization method is characterized by ceramics that do not withstand high temperatures. , can ensure the dimensional accuracy of the parts, the metallized film is continuous and dense, has good thermal conductivity, low high-frequency loss, and high strength, but it can only deposit a single metal element, so it can only be called a ceramic surface metallization method. In addition, because it has no activity The role of elements, the bonding strength of the metal layer and ceramics is low

[0005] Based on the beneficial effect of the chemical reaction between active element titanium and ceramics, the applicant has carried out arc glow titanium infiltration on the ceramic surface, but this method only makes the ceramic surface realize titanium metallization, the metal element is single, and the adaptability is poor , and due to the strong oxygen affinity of titanium, the metal titanium layer is easily oxidized by the atmosphere, and the formation of an oxide film is not conducive to the subsequent application process

For example, in the connection between ceramics and metals based on this, since the titanium layer permeated on the surface of the ceramics is difficult to react and mix with the solder during the brazing process, a layer of titanium is retained on the ceramic side of the ceramics and metal connection joints. layer, which affects the wetting and reaction of the solder and the ceramic, and directly affects the connection strength between the ceramic and the metal. The presence of a large number of intermetallic compounds on the ceramic side of the joint increases the brittleness of the joint, and it is prone to cracking under the action of residual stress

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