Study On Corrosion And Abrasion Of Copper Clad B₄C Particles Sps Sintering Aluminum Matrix Composites

Aluminum boron carbide composite material has excellent functionality and constitutive property, it is widely used in aerospace industries association, automobile field and nuclear electrical field. But in the traditional preparation of composite materials, in consequence the poor wettability between boron carbide/aluminum matrix, they can’t form effective combination between each other, cause the decrease of the material performance. This article adopt electroless copper deposition manufacture copper clad B4 C, use copper plating layer as a transition to strengthen the combination between boron carbide particles and matrix.Electroless copper plating on boron carbide is mainly divided into two parts, pre treatment and copper plating, by analyzing the effect of cleaning before plating, sensitization treatment, activation process, composition of copper plating solution, temperature, pH and so on; the copper plating process parameters were optimized, and the coating of copper on the surface of boron carbide was successfully achieved. The optimum parameters of copper plating bath: 10g/L(CuSO4),15ml/L(HCHO),20g/L(C4O6H2KNa),25g/L(EDTA),15mg/L(K4[Fe(CN)6]·3H2O),10g/L(Na2CO3);the best temperature of electroless plating was 50, and the pH value was 12-12.5. Micro morphology observation(SEM) and X- ray energy spectrum analysis(EDS) of boron carbide particles after electroless copper plating, it can be known that the copper plating layer on the surface of the particles is uniform and the copper content is more than 15%.The quality fractions of copper clad aluminum matrix composites with 10%, 30%, 40%, 50%, 20%, respectively, were prepared by the spark plasma sintering technology.,and there was a Al2 Cu phase. The bending strength of the composites was tested, compared with the composites prepared by electroless copper plating, the bending strength of the composite prepared by copper plating was higher, and the degree of increase was 6%-20%; according to the internal structure of the composite, it is considered that the reaction between the copper plating layer and the substrate can be combined to improve the properties of the composite.Aluminum boron carbide base composite materials are widely used in the spent fuel storage, and its working environment is soaked in boric acid solution and service life of more than 8000 h, so the use of electrochemical corrosion test of composite corrosion resistance were detected. The possible reasons for the corrosion resistance of the copper plating layer were obtained by combining the micro morphology of the composite surface and the simulation circuit: boron carbide particle is not involved in the basic corrosion, the corrosion resistance of composite materials is mainly determined in the matrix, and particles on the surface of the copper layer in preparation process in the reaction with the aluminum matrix generated second phase al2 cu, and aluminum matrix formed new cell reaction and Al2 Cu as anode in the corrosion process protect the aluminum matrix, retards the corrosion of aluminum matrix liquid corrosion; at the same time due to the coated copper carbide boron particles and aluminum matrix with good, reduce the existence of micro cracks and other defects, from the physical aspect again to enhance the corrosion resistance of materials, and ultimately makes the corrosion resistance of the material was improved.Boron carbide composite material due to the boron carbide wear good is also often used as wear-resistant materials, so wear properties of copper coated boron carbide aluminum matrix composites were studied using high-speed reciprocating friction and wear of composite wear performance test. Test results show that the copper coated boron carbide composite wear rate decreased, while the width of the scratch gradually decreased with the increase of the content of boron carbide, but such as the friction coefficient of the material is showing a different sequence of changes. The change of friction coefficient is considered to be caused by the change of wear mechanism in the process of material wear. Boron carbide quality scores before reaching 20%, composite the main wear mechanism is adhesive wear; after more than 20%, grinding particle wear, increasing the proportion of, adhesive wear will continue to reduce, until the 40%; more than 40 percent, oxidative wear is main wear mechanism of the composites, accompanied by a small amount of adhesive wear and abrasive wear.