Oxidation of Sputtered Cu-Cr Alloy Microcrystalline Coatings

1 Abstract The magnetocrystalline sputtering was used to prepare different coatings of 0 and alloys, and their oxidation in 700 and 800 伫, 0.3 pure oxygen was studied.

As a result, the oxidation behavior of the alloy microcrystalline coating is obviously different from that of the ordinary alloy. 0 Alloy 1 alloy microcrystalline coating has formed a continuous 0203 layer after oxidation, and an alloy microcrystalline coating containing 40 is oxidized and formed. Single 2,3 film, this article combines the characteristics of oxidation of dual-phase alloys to discuss the experimental results.

At present, the research on the preparation and properties of alloy 0 has attracted much attention.

On the other hand, it is a kind of vacuum contact material with wide application prospects.

On the other hand, because, 1! The mutual solubility between 0 and 0 is small and no mesophase is formed. The thermodynamic stability and growth rate of the oxides of 01 and 0 are greatly different, which makes it a typical system for high-temperature corrosion studies of the meta dual-phase alloy.

The corrosion behavior of alloy 10 and alloy 0 alloy prepared by electric arc furnace smelting by alloy powder metallurgy is studied under different conditions. It is obvious that the microstructure of the alloy has an important influence on the oxidation behavior of the dual phase alloy. In order to advance the discussion of the oxidation rule of the meta-phase alloy, magnetron sputtering method was used to prepare alloys with different contents and amounts. The National Natural Science Foundation of China 59871050 and 59725101 received the first draft date of 19991009, and received the revised draft date of 20000105. , Female, born in 1965, associate professor, Ph.D. Crystal Coating, and studied its oxidation in 700 with 800, 0.1 river, 1 pure oxygen.

1 Experimental method Magnetron sputtering was used to prepare different microcrystalline alloy coatings. The base material and sample substrate were vacuum smelted. The alloy and target were formed by the two components alloys 50 and 25. In this way, different alloys containing different amounts and amounts of microcrystalline coating, substrate, power density of 5 circles, argon pressure of 0.4 wood matrix temperature of 300 0.1 pure oxygen were continuously oxidized 24, and the corrosion kinetic data were continuously measured by the 12000 thermobalance. Scanning electron microscope 310 and ray diffraction were used to analyze the composition and texture of the oxidized sample.

2 Experimental results 2.1 The microstructure of the coating sputtered 0 The thickness of the microcrystalline coating of the alloy is approximately 30 anal. The ray diffraction analysis shows that the two components of the cucr alloy microcrystalline coating are rich, 1 phase and rich, 40 phase. The two-phase composition and the two-phase particles are very fine and cannot be observed by scanning electron microscopy using a backscattering image. At the same time, the grain size of the two phases is also small. Less than 10,2.2 Oxidative kinetic sputtering, oxidation kinetic curve of alloy microcrystalline coating 2.

The speeds are all very fast. After about 401, the oxidation rate is obviously decreased, and the oxidation gain is small. The oxidation gain of SPCu25Cr is slightly higher than that of SPCu40Cr, 2.3. The structure and composition of the film are analyzed, and the SPCu25Cr is both oxidized at 700 and 800 tons. A two-layer film structure was formed, with 700 layers being 2, 4, and 2, 3 layers below. In the continuous, 203-layer coating matrix forms a continuous lean, layer 3, order 8, 0, when the layer is 0, below which is still continuous Cr2O3S5C3a, b.SPCu40CriSPCu 25 different, in the oxidation of 700 and 800 Both the formation of a single 203 film and coating matrix lean, with 3, but because 203 film is more brittle, in the cooling and sample pre-grinding process some fragmentation.

3 Discussion The critical, concentration mass fractions required for the three-phase meta-phase FeC, C0Cr and NiC superalloy systems are formed by selective oxidation. The same is 15251 while the two-phase alloy is different. In a typical 10 alloy system, the as-cast alloy has a content of 50, and even at the highest 0 content in the rich zone, it is still insufficient to form a complete, 2,3 protective film. This is mainly due to the presence of two different phases in the alloy and the very low solid solubility in 0,1 at 800 is only 6.3104, and the rate of transfer from the alloy to the oxide film substrate interface is quite low. At the same time, the oxidation rate of 1 is much higher than 1, which results in continuous formation on the faces of two-phase 0,1 alloys, and the three-layer is much more difficult than single-phase solid solution alloys. Many meta-alloys with very low mutual solubility of two groups of elements, such as hexahydrate, hexahydrate, and 0,6, belong to this situation. Even if the concentration of active elements is high, the continuous oxide layer 7+91 cannot be formed. In fact, In the alloy composed of two solid solution phases, if the solid solution of the active component 5 in the stable component 4 is very low, the critical value of the 3 concentration required for the formation of the outer oxide layer 5 through selective oxidation is higher than that of the single phase solid solution. The alloy is much higher; in extreme cases, when the solid solubility of 3 in 4 is too low, any composition of ordinary particle size alloys cannot form a single oxide film, even at the richest 5 oxide matrix.

Compared with ordinary as-cast CuC alloys and powder metallurgy CuC alloys, the mechanical alloying method produces relatively uniform microstructure and fine particles. When rich, the first phase particles are around 1 with 20, 1 and 400 alloyed surfaces, and after 0, 20 or. Both of the 22 and 4 below form continuous 2, 3 layers, and a continuous lean zone is formed in the continuous, 203-layer underlying alloy matrix. This is mainly the refinement of the two-phase particles, which accelerates the dissolution of the particles, shortens the diffusion distance, and effectively promotes the formation of the 203 layer. In fact, the distance between two cr particles adjacent to the cu-rich phase at the same content is small. At the same time, small particles, large area, faster dissolution rate faster particles, fast through the small particles; In addition, after the two-phase particles refined, the interface between the two phases increased, the number of dissolved children at the phase interface also increased, also beneficial, 2,3 Film formation. Although the mechanical alloying alloy 0 forms a continuous 2, 3 layer, it still has not formed a single 0203 outer oxide film. It is apparent that when the content is 40, mechanical alloying occurs. The microstructure of the 1 alloy still cannot satisfy the single 0203. Oxide film formation needs.

The oxidative weight gain after the deuteration of 4 on 1 pure oxygen is smaller. The 250-containing, 1-alloy micro-eutectic coating forms a three-layered two-layered film structure, while the 40-element alloyed micro-coating layer forms only a single, 2,3è…†.

Leakage 0 alloy microcrystalline coating of the two-phase indium particles very fine, adjacent one, the distance between capsules, very small. Accelerate the transmission of the skin to the alloy surface; the grain size of both phases is also small. The number of grain boundaries has increased, and the channels of the meat alloy surface have been expanded to promote the formation of 303 and belly.

159 Fu Guangyan, Niu Wei class. Journal of Jinyi University, 19M; 34159 Fu Guangyan, Niu Anzhong, Nonferrous Metals, Journal, 200C; 101 Fu Guangyan. Niu, Wang, Guan Rong. Chinese Journal of Materia Medica and Protection, receiving