Preparation and properties of Ti (C, N) based ceramic composites by hot pressing sintering 2024-02-04

Titanium carbide nitride (Ti (C, N)) based ceramic composites were prepared by hot pressing sintering process. The fracture and surface morphology of the samples were analyzed using field emission scanning electron microscopy (SEM).Don't observe, the mechanical properties were tested and its antioxidant performance was studied. The research results show that the microstructure, morphology, and density of the sample's fracture surface are high, and the number of pores is high.Few, with clear grain boundaries and small grain size. The fracture path of the crack is clear and uneven, and there are both transgranular and transgranular fracture modes. The mechanical properties are: bending strength 1255 MPa, fracture toughness 8.3 MPa · m1/2, Vickers hardness 11.9 GPa, relative density 98.7%. After oxidation for 2 hours under the set temperature conditions, no oxidation was formed at 750 ℃. Membrane layer; At 900 ℃, the oxide film formed on the surface of the sample has no protective effect on the substrate; At 1150 ℃, a dense protective layer was formed on the surface of the sample, which had a protective effect on the matrix. The thickness of the oxide film layer and intermediate transition layer is approximately 73.81 μ m. And the thickness of the intermediate transition layer is about 18.57 μ M.