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Tantalum Carbide Composite

wallpapers News 2021-08-10
Macro organization
The sample was incubated at 1160℃ for 1 h to form a TaC/Fe gradient composite material. Macroscopic observation found that: the reaction layer has an obvious gradient, uniform transition, good combination with the matrix, and no obvious peeling phenomenon. The thickness of the reaction zone during the entire diffusion-reaction process is about 1180μm. The sample mainly has four layers, namely A layer, B layer, C layer and substrate.
Tissue composition
Perform XRD analysis on composite material samples. There are three phases of α-Fe, TaC, and G (graphite) in the reaction zone. There are no intermediate phases of Fe, Ta and Ta2C. It can be seen that the diffusion-reaction is very sufficient at this temperature, and a large amount of C diffuses and participates in the reaction.
Do point energy spectrum analysis on cuboid particles and cube particles in the reaction area. The analysis results show that in addition to Ta and C, there is also a small amount of Fe in the square particle phase. The percentage of Ta atoms to C atoms is close to 1:1. This is mainly because the products Ta and TaC can dissolve into the austenite and precipitate to form TaC during the subsequent cooling process, and part of the Fe is still embedded in it, so a small amount of Fe is detected. According to comprehensive judgment, the cuboid and cube particles are both TaC, but there is no intermediate product Ta2C.
Microstructure
The microstructure and morphology of TaC surface gradient composites were analyzed. They are the microstructure morphology of the A layer, B layer and C layer of the macrostructure of the TaC gradient composite material. The particles in layer A are agglomerated tightly, the reaction is uniform, and the particles are not dispersed at all. The particle size is at the nanometer level, so this reaction layer is called a nano-TaC layer; the B layer has already appeared in the shape of square particles, the particles are connected and interwoven, and are not dispersed. Its size is in the range of micrometers, so this reaction layer is called a micron TaC layer; the particles of layer C are in the junction with the matrix, and the particles are separated by a strip of pearlite tissue, so that the boundary is clearly visible, and the particles are in the reaction zone The edges are completely dispersed, so this reaction layer is called a TaC dispersion layer.


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