Effect of LF refining slag addition on wear resistance of Fe-Cr based ceramic composites
LF refining slag contains iron oxide,calcium oxide,silicon dioxide,aluminum oxide,magnesium oxide,iron and so on.However,it is always piled up as solid waste,which not only pollutes the environment but also results in the waste of alloying elements.Some of the alloying oxide can be reduced by Al during thermite reaction,which can reduce waste of alloying elements in LF slag.Calcium oxide can react with aluminum oxide formed by thermite reaction,which can reduce melting point of aluminum oxide and make it easy to float.In addition,mixture of LF refining slag and CaF2 can be added as coolant,which will solve the problems of evaporation of reaction raw materials and low density of Fe-Cr based ceramic composites caused by high heat release of combustion synthesis reaction system,to absorb reaction heat and reduce the temperature of reaction system to reduce the evaporation of raw materials.However,the wear-resistant layer could not connect with the steel plate as too many LF refining slag were added.In this work,in order to explore the appropriate amount of LF refining slag,2,4,6,8,10 g LF refining slag and 2.39,2.50,2.60,2.71,2.81 g CaF2 were designed to study the welding area of steel plate and wear-resistant layer,the density,hardness,and wear resistance of samples fabricated by combustion synthesis.The results showed that the density of wear-resistant layer was the best as added 8 g LF refining slag;abrasion loss per unit area of wear-resistant layer was the least as added 8 g LF refining slag;the hardness of the wear layer was the highest as added 10 g LF refining slag;the welding area of wear-resistant layer and steel plate was the largest as added 10 g LF refining slag.Both density and hardness had positive effect on the wear resistance of the composite,which would be increased with increase of each of them as difference of the other property was not large.In summary,in order to obtain high wear resistance while ensuring the uniformity of other properties of Fe-Cr based ceramic composites,the optimal addition amount of LF refining slag is 8 g.
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