The failure behavior and surface strengthening technology of valve trims in coal chemical industry equipment
In view of the deterioration of the material of key valve internal parts in coal chemical equipment,the macro-micro multi-scale analysis method was used to study the failure risk factors of valve trims under different service conditions,and surface strengthening strategy for valve trims was proposed.The results show that in the gas-solid dilute phase medium,the material loss caused by gas-solid two-phase erosion leads to the valve trim failure;In gas-solid dense phase medium,the coupling of multiple factors such as pulverized coal erosion,particle and adhesive wear leads to the valve trim failure,and erosion is the main factor.In liquid-solid medium,the coupling of corrosion,erosion,wear and other factors leads to the valve trim failure.Based on failure risk of key valve trims and in combination with the principle of strength-plasticity-toughness adaptability of materials,a failure prevention and control strategy of multi-functional integrated coatings was proposed.NiCr-Cr3C2 metal-ceramic coatings on the substrate surface were prepared by supersonic plasma spraying technology.The morphology of the coating displayed dense structure and the hardness was increased to HV0.31013.Compared with the hardness of stainless steel,the hardness of the coating was increased by nearly 5 times.The tensile testing of bonding between the coating and the substrate shows that the strength reaches 67 MPa and the excellent impact resistance performance,thus realizing the reinforcement of materials surface.
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