Research On The Interface Compatibility Of Three Dimension Metal Ceramic

The high brittleness and heterogeneity of ceramic threaten the reliability and applying area of the ceramic hardware. To reduce the brittleness of ceramic, the metal phase is introduced to the ceramic phase to enhance the toughness. However, the combining between metal phase and ceramic phase is bad. In this article, aiming at the existing problems of the composite material, electroless composite plating is processed on nickel foam before it is introduced in the ceramic phase. Mainly on nano-Al₂O₃ particle, the process conditions of preparation of nano particle electroless composite plating is studied. At the same time, the process conditions of preparation three-dimension-meshy-metal/nano-Al2O3 composite material is discussed primarily.The factors such as milling mode, content of nano particle in the bath, temperature, the pH value of the bath and plating time that may influence the surface properties were investigated; moreover, the optimizing process conditions are found out. This paper also worked over the influence of the composited quantity and dispersing quality in the coatings on the its surface shape, rigidity, corrosion resistance, etc.The experiment results indicated that under the condition of ultrasonic milling, the temperature is 90℃,the pH value is 4.8, the concentration of nano particle is 10g·L^-1, plating time is 1.5h, the aggrading rate is higher than 19μm·h^-1. The composited quantity in the coatings is high, the rigidity of the coatings is high and corrosion resistance of the coatings is good and surface shape is much better.The figurating ways of draw-out filtering, spontaneously adsorbing, paste-smearing, push-infusing and plaster mode absorbing are used for shaping the roughcast of the composite material. The compactness of the roughcast made in the different ways is compared. The results indicated that the compactness of the roughcast made in the way of push-infusing and plaster mode absorbing is optimal. The compactness of the roughcast can be enhanced further after processing by press-maker; the proper content of connective agent is 0.8%.No-pressure sintering is used in agglomerating the roughcast of the composite material. During the sintering process, the nickel foam is oxidated under the condition of no protecting gas. When protected by Ar gas, the roughcast grew into composite ceramic, and after sintering, the content of nickel foam in the samples decreased. Finally the conclusion obtained is that compactness of the roughcast and the environment of sintering-process were the key factors to the preparation of composite ceramic. In addition, the paper made preliminary step discuss on the mechanism of electroless composite codeposition using nano powder. The toughness-enhancing mechanism of metal-ceramic is also discussed.