Study on properties of low temperature vitrified bond modified by aluminum powder

To meliorate the properties of low temperature vitrified bond, aluminum powder was added into the vitrified bond by using powder metallurgy method and the metal-ceramic bond was sintered by vacuum hot pressing sintering furnace.The mechanical properties and microstructure of the vitrified bond modified by aluminum powder were investigated.The results show that the average flexural strength and impact strength of the vitrified bond with mass fraction of 20% aluminum powder are significantly improved to 116.32 MPa and 13.01 kJ/m², which are 42% and 414% higher than those of low temperature vitrified bond without aluminum powder, respectively.The addition of aluminum powder has no obvious effect on the density of the vitrified bond.As the mass fraction of aluminum powder increases, the hardness of the vitrified bond generally decreases.Aluminum powder particles can exist in the form of metallic aluminum and show good dispersibility in the low temperature vitrified bond, which can improve the toughness.In the metal-ceramic bond, elements diffusion occurs at the interface between the metal phase and low-temperature vitrified bond, forming a transition zone.And the metal phase and low temperature vitrified bond are inlaid with respect to each other, and possess excellent combination.