The distribution of electric potential in plasma and paste is measured with samples equipped with probes under various technical conditions. A model of boronizing reaction is proposed based on the chemical reaction in...The distribution of electric potential in plasma and paste is measured with samples equipped with probes under various technical conditions. A model of boronizing reaction is proposed based on the chemical reaction in the boronizing agent. A kinetic law of boronizing is deduced from the measured boronizing rate and the quality change under various temperature, time and discharging power conditions.展开更多
Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity o...Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity of B4C coating were manufactured by plasma spray. It was lamellar packing and dense. The B4C coating examined here contained two principal structures and two impurity phase besides major phase. The relatively small value of Young's modulus, comparing with that of the bulk materials, is explained by porosity . The Fe impurity phase could account for the relatively high electrical conductivity of boron carbide coating by comparing with the general boron carbide materials.展开更多
文摘The distribution of electric potential in plasma and paste is measured with samples equipped with probes under various technical conditions. A model of boronizing reaction is proposed based on the chemical reaction in the boronizing agent. A kinetic law of boronizing is deduced from the measured boronizing rate and the quality change under various temperature, time and discharging power conditions.
文摘Microstructure of plasma spray boron carbide coating was studied by SEM and TEM. Its physical, mechanical and electrical properties were measured. The results showed that high microhardness, modulus and low porosity of B4C coating were manufactured by plasma spray. It was lamellar packing and dense. The B4C coating examined here contained two principal structures and two impurity phase besides major phase. The relatively small value of Young's modulus, comparing with that of the bulk materials, is explained by porosity . The Fe impurity phase could account for the relatively high electrical conductivity of boron carbide coating by comparing with the general boron carbide materials.
