Ti3AlC2/Ti5Si3 compound material and its preparation method
An aluminum titanium carbide and composite material technology, which is applied in the field of in-situ synthesis of a titanium silicide particle reinforced aluminum titanium carbide-based composite material and its preparation field, can solve the problems of unsatisfactory reinforcement effect, low bending strength and the like, and achieve excellent high temperature The effect of oxidation resistance, low cost and simple process
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Embodiment 1
[0017] 73.63 grams of titanium powder, 13.13 grams of aluminum powder, 2.16 grams of silicon powder and 11.08 grams of graphite with a particle size range of 200 to 400 meshes were ball milled in a ball mill tank for 8 hours, and then put into a graphite mold for cold press molding, and the applied pressure was 10 MPa. Put it into a hot-press furnace for hot-pressing sintering. The heating rate is 10°C / min, heated to 1400°C and kept for 2 hours, while the pressure is gradually increased to 25MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed by X-ray diffraction as Ti 3 AlC 2 and Ti 5 Si 3 two phases, such as figure 1 (a) shown. Quantitative phase analysis indicated that Ti 5 Si 3 The volume content is about 12%. The Vickers hardness of the composite material is 3.49GPa (load is 10N), the compressive strength is 819MPa, and the fracture toughness is 7.87MPa m 1 / 2 .
Embodiment 2
[0019] 73.59 grams of titanium powder, 11.74 grams of aluminum powder, 3.6 grams of silicon powder, and 11.07 grams of graphite in the particle size range of 200 to 400 meshes were ball milled in a ball mill jar for 16 hours, and then put into a graphite mold for cold pressing, and the applied pressure was 15 MPa. Put it into a hot-press furnace for hot-pressing sintering. The heating rate is 20°C / min, heated to 1500°C and kept for 1 hour, while the pressure is gradually increased to 30MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed by X-ray diffraction as Ti 3 AlC 2 and Ti 5 Si 3 two phases, such as figure 1 (b) shown. Quantitative phase analysis indicated that Ti 5 Si 3 The volume content is about 20%. The Vickers hardness of the composite material is 3.79GPa, the compressive strength is 919MPa, and the fracture toughness is 7.09MPa m 1 / 2 .
Embodiment 3
[0021] 73.55 grams of titanium powder, 10.36 grams of aluminum powder, 5.03 grams of silicon powder and 11.15 grams of graphite with a particle size ranging from 200 to 400 meshes were ball milled in an alcohol medium, and then put into a graphite mold for cold press molding. The applied pressure was 20 MPa. Sintering by hot isostatic pressing in a hot-press furnace. The heating rate is 50°C / min, heated to 1600°C and kept for 0.5 hours, while the pressure is gradually increased to 20MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed as Ti by X-ray diffraction analysis. 3 AlC 2 and Ti 5 Si 3 two phases, such as figure 1 (c) shown. Quantitative phase analysis indicated that Ti 5 Si 3 The volume content is about 30%. The Vickers hardness of the composite material is 4.37GPa, the compressive strength is 966MPa, and the fracture toughness is 7.96MPa m 1 / 2 .
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