The Technology Research Of Liquid Phase Diffusion Bonding Of Ceramic Matrix Composites

Ti(C,N)-Al2O3 Ceramic Matrix Composites have high red hardness, wear resistance and oxidation resistance, which is an ideal material to be used to make high speed cutting tool. Since it has a crisp toughness and poor impact resistance performance, it is difficult to make by machining complex zero components, which has extremely restricted its application. Therefore, it will make a great value in engineering application, which deal with the realization of Ti(C,N)-Al2O3 Ceramic Matrix Composites and its matrix of reliable connection. This subject applied the connection of Ti(C,N)-Al2O3 with Ti/Cu/Ti, Zr/Cu/Zr,Cu36Zr64 interlayer respectively, which analyzed and tested for joint microstructure,element distribution and fracture morphology with scanning electron microscope(SEM),energy spectrum analyzer(EDS), and universal testing machine and studied the different intermediary material and the influence of process parameters on the joint organization and mechanical properties.In the part of partial transient liquid phase diffusion bonding of Ti(C,N)-Al2O3 Ceramic Matrix Composites applied with Ti/Cu/Ti composite layer material. Results show that the joint gets the maximum bending strength, under the technological parameters of 1050 ℃,15 min, 3MPa. The typical joint structure is Ti(C,N)-Al2O3/Ti3Al+Ti Al+Ti Al3+Ti2Ni+Ti O/Cu Ti+Cu4Ti3+Cu4Ti+Cu base solid solution/Cu foil. Under different process parameters of the interface phase structure is also different. The fracture way of joint is ceramic substrate brittle fracture. Formed in the transition zone, Ti Al3 brittle compound layer have significantly reduced the mechanical properties of joint.As for Ti(C,N)-Al2O3/Zr/Cu/Zr/Ti(C,N)-Al2O3 partial transient liquid phase diffusion bonding. It proved that the element of Zr have good wetting diffusion performance for ceramics. If the aging time is too short, Zr to the diffusion in the ceramic is not sufficient, or it makes Zr, Cu in the interface reaction generates a large number of brittle compounds if the aging time is too long. While under 1050℃’s welding temperature, 15 min’s heat preservation ensures the highest four-point bending strength, as well as the best welded joint.Applies with Cu36Zr64 amorphous filler metals in the vacuum brazing Ti(C,N)-Al2O3 ceramics matrix composites. The results show that Zr and Cu have excellent diffusivity for the ceramic matrix composites. Under the technological parameters of 1000℃, 15 min, 1MPa, the welded joint gets the highest four-point bending strength. And the joint interface structure is Ti(C,N)-Al2O3/α-(Ti,Zr)+Cu2Ti Zr/Cu Zr2+(α-Zr)/Cu solid solution/Cu foil. The fracture way of joint is mixed fracture. Large residual stress and the enrichment of Cu2 Ti Zr,Cu Zr2 become the main causes of the fracture.