초록

There are many factors affecting the production process depending on the raw materials, equipment and technology used inthe production of composite materials. Reaching the desired density and strength of the product to be obtained is possible withappropriate arrangements and reinforcements to be made at every stage. Composite materials that combine more than onefeature are produced in material groups. In this study, composite production was made with nickel-based (0.4% BN ceramic+ 27.07% Astaloy CrM metallic) + 72.53%Ni powders by applying electroless nickel plating process, and these metallic andceramic powders were used for reinforcement. After these samples were shaped circularly in a uniaxial cold press, they weresintered in an argon atmosphere conventional furnace at 1000, 1100, 1200, 1300 and 1400 °C for two hours. The mechanicaland ultrasonic properties of the composite samples obtained with the addition of nickel-coated ceramic and metallic powderwithout electric current were determined. The effect of changing the sintering temperatures of Ni-based composite samples onultrasonic properties was measured by ultrasonic pulse echo method. The sintering temperature was found to be one of themost effective factors on the propagation velocity of ultrasonic waves, Young's modulus and shear modulus, Poisson ratio. Atthe same time, Young's modulus and shear modulus and Poisson ratios changed depending on the propagation velocity of theultrasonic waves. In addition, the results obtained by XRD analysis and SEM (Scanning Electron Microscopy) metallographicevaluation on the composite samples were supported.

키워드

Elastic modulus, Sintering temperature, Ultrasonic velocity, Poisson ratio, Hardness.

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