A kind of preparation method of titanium-silicon alloy phase reinforced tial-based composite material with network structure

Abstract

The invention relates to a method for preparing a TiAl-based composite material reinforced with a network structure titanium-silicon alloy phase. The method refers to prealloying 65% to 85% of Ti-46Al-2Cr-2Nb powder in terms of mass fraction With 15%~35% Ti 5 Si 3 The powder is mechanically mixed, vacuum hot-pressed and sintered, and cooled at room temperature to obtain a network structure Ti 5 Si 3 Reinforced TiAl-based composites. The preparation process of the present invention is simple, the cost is low, and the product performance is stable, and the prepared network structure Ti 5 Si 3 Reinforced TiAl-based composites have high compressive strength and excellent anti-wear properties, and can be used as new structural and anti-wear materials.

Description

technical field

[0001] The invention relates to the technical field of metal matrix composite material preparation, in particular to a network structure titanium-silicon alloy phase (Ti 5 Si 3 ) method for the preparation of reinforced TiAl-based composites. Background technique

[0002] TiAl-based intermetallic compounds have the advantages of light weight, high specific strength, high specific rigidity, excellent high-temperature mechanics, oxidation resistance and creep resistance, and good flame retardancy. High temperature structural materials. In recent years, the room temperature plasticity and high temperature properties of TiAl intermetallic compounds have been greatly improved by alloying, heat treatment and thermomechanical treatment ( Rare Metal Materials and Engineering, 2011, 44(12): 2060-2064 ). However, a single TiAl intermetallic compound is difficult to meet the comprehensive requirements for high-temperature strength, creep resistance, durability, and ...

Examples

Embodiment 1

[0022] Example 1 A method for preparing a network-structured titanium-silicon alloy phase-reinforced TiAl-based composite material. In terms of mass fraction, 85% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 15% of Ti 5 Si 3 The powder is mixed uniformly in a low-energy ball mill at a speed of 300r / min for 8 hours. Mix the TiAl-Ti evenly 5 Si 3 The powder material was put into a graphite mold, and placed in a vacuum hot-press sintering furnace, the sintering temperature was 1300°C, the pressure was 28MPa, and the heat preservation and pressure holding time was 30min. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0023] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; after mixing evenly, put the mixed powder in a hot-pres...

Embodiment 2

[0024] Example 2 A method for preparing a network structure titanium-silicon alloy phase-reinforced TiAl-based composite material, by mass fraction, 70% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 30% of Ti 5 Si 3 The powder is mixed evenly in a low-energy ball mill at a speed of 350r / min for 12h. Mix the TiAl-Ti evenly 5 Si 3 The powder material was put into a graphite mold and placed in a vacuum hot-press sintering furnace with a sintering temperature of 1350 °C, a pressure of 30 MPa, and a holding time of 60 min. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0025] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; After mixing evenly, put the mixed powder in a hot-press furnace, and conduct pressureless heat treatment ...

Embodiment 3

[0026] Example 3 A method for preparing a network structure titanium-silicon alloy phase-reinforced TiAl-based composite material, by mass fraction, 65% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 35% of Ti 5 Si 3 The powder is mixed evenly in a low-energy ball mill at a speed of 400r / min for 10h. Mix the TiAl-Ti evenly 5 Si 3 The powder material is put into a graphite mold, and placed in a vacuum hot-press sintering furnace, the sintering temperature is 1400°C, the pressure is 20MPa, and the heat preservation and pressure holding time is 2h. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0027] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; After mixing evenly, put the mixed powder in a hot-press furnace, and carry out...

technical field

[0001] The invention relates to the technical field of metal matrix composite material preparation, in particular to a network structure titanium-silicon alloy phase (Ti 5 Si 3 ) method for the preparation of reinforced TiAl-based composites. Background technique

[0002] TiAl-based intermetallic compounds have the advantages of light weight, high specific strength, high specific rigidity, excellent high-temperature mechanics, oxidation resistance and creep resistance, and good flame retardancy. High temperature structural materials. In recent years, the room temperature plasticity and high temperature properties of TiAl intermetallic compounds have been greatly improved by alloying, heat treatment and thermomechanical treatment ( Rare Metal Materials and Engineering, 2011, 44(12): 2060-2064 ). However, a single TiAl intermetallic compound is difficult to meet the comprehensive requirements for high-temperature strength, creep resistance, durability, and ...

Examples

Embodiment 1

[0022] Example 1 A method for preparing a network-structured titanium-silicon alloy phase-reinforced TiAl-based composite material. In terms of mass fraction, 85% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 15% of Ti 5 Si 3 The powder is mixed uniformly in a low-energy ball mill at a speed of 300r / min for 8 hours. Mix the TiAl-Ti evenly 5 Si 3 The powder material was put into a graphite mold, and placed in a vacuum hot-press sintering furnace, the sintering temperature was 1300°C, the pressure was 28MPa, and the heat preservation and pressure holding time was 30min. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0023] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; after mixing evenly, put the mixed powder in a hot-pres...

Embodiment 2

[0024] Example 2 A method for preparing a network structure titanium-silicon alloy phase-reinforced TiAl-based composite material, by mass fraction, 70% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 30% of Ti 5 Si 3 The powder is mixed evenly in a low-energy ball mill at a speed of 350r / min for 12h. Mix the TiAl-Ti evenly 5 Si 3 The powder material was put into a graphite mold and placed in a vacuum hot-press sintering furnace with a sintering temperature of 1350 °C, a pressure of 30 MPa, and a holding time of 60 min. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0025] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; After mixing evenly, put the mixed powder in a hot-press furnace, and conduct pressureless heat treatment ...

Embodiment 3

[0026] Example 3 A method for preparing a network structure titanium-silicon alloy phase-reinforced TiAl-based composite material, by mass fraction, 65% of pre-alloyed Ti-46Al-2Cr-2Nb powder and 35% of Ti 5 Si 3 The powder is mixed evenly in a low-energy ball mill at a speed of 400r / min for 10h. Mix the TiAl-Ti evenly 5 Si 3 The powder material is put into a graphite mold, and placed in a vacuum hot-press sintering furnace, the sintering temperature is 1400°C, the pressure is 20MPa, and the heat preservation and pressure holding time is 2h. After vacuum hot pressing sintering and cooling at room temperature, the network structure Ti 5 Si 3 Reinforced TiAl-based composites.

[0027] Among them: pre-alloyed Ti-46Al-2Cr-2Nb powder refers to weighing Ti, Al, Cr, Nb element powders according to the atomic percentage of 50:46:2:2 and mixing them in a low-energy ball mill at a speed of 350 r / min 8h; After mixing evenly, put the mixed powder in a hot-press furnace, and carry out...

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