Normal-pressure multi-step sintering method for powder metallurgy of high-density Ti-Nb-Mo series alloy

A technology of ti-nb-mo and sintering method, which is applied in the field of alloys, can solve the problems of coarse grains of titanium alloys, increase power consumption and production costs, and low density, so as to achieve uniform structure and performance, accelerate diffusion speed, The effect of high density

Active Publication Date: 2020-05-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the titanium alloy obtained by the conventional atmospheric pressure sintering process often has coarse grains and low density. To achieve the purpose of increasing the density, usually only by increasing the sintering temperature or prolonging the holding time, this method greatly increases the power consumption. and production costs

Method used

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  • Normal-pressure multi-step sintering method for powder metallurgy of high-density Ti-Nb-Mo series alloy
  • Normal-pressure multi-step sintering method for powder metallurgy of high-density Ti-Nb-Mo series alloy
  • Normal-pressure multi-step sintering method for powder metallurgy of high-density Ti-Nb-Mo series alloy

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Take by weighing raw material titanium powder 65%, niobium powder 25%, molybdenum powder 8%, vanadium powder 4% and chromium powder 3% according to mass percentage, carry out compression molding after mixing, obtain compact, wherein the temperature of compression molding is Room temperature, pressure 500MPa;

[0044] (2) After obtaining the compact, carry out programmed temperature rise, the specific operations are:

[0045] The vacuum degree in the sintering furnace is reduced to 2×10 -3 After Pa, flow H 2 Until the pressure in the furnace is stabilized at 1×10 5 After Pa, open the outlet valve and set H 2 The flow rate is kept at 150mL / min, and the temperature is first raised from room temperature to 500°C at a heating rate of 5°C / min;

[0046] Stop feeding hydrogen, and reduce the vacuum degree in the sintering furnace to 2×10 -3 After Pa, pass high-purity argon gas into the furnace, and the vacuum degree in the furnace rises to 1×10 5 After Pa, close the i...

Embodiment 2

[0052] (1) Take by weighing raw material titanium powder 65%, niobium powder 25%, molybdenum powder 8%, vanadium powder 4% and chromium powder 3% according to mass percentage, carry out compression molding after mixing, obtain compact, wherein the temperature of compression molding is Room temperature, pressure 400MPa;

[0053] (2) After obtaining the compact, carry out programmed temperature rise, the specific operations are:

[0054] The vacuum degree in the sintering furnace is reduced to 4×10 -3 After Pa, flow H 2 Until the pressure in the furnace is stabilized at 1×10 5 After Pa, open the outlet valve and set H 2 The flow rate was kept at 200mL / min, and the temperature was first raised from room temperature to 400°C at a heating rate of 5°C / min;

[0055] Stop feeding hydrogen, and reduce the vacuum degree in the sintering furnace to 2×10 -3 After Pa, pass high-purity argon gas into the furnace, and the vacuum degree in the furnace rises to 1×10 5 After Pa, close the...

Embodiment 3

[0062] (1) Take raw material titanium powder 54%, niobium powder 35%, molybdenum powder 8%, vanadium powder 2% and chromium powder 1% according to mass percentage, carry out compression molding after mixing, obtain compact, wherein the temperature of compression molding is At room temperature, the pressure is 450MPa;

[0063] (2) After obtaining the compact, carry out programmed temperature rise, the specific operations are:

[0064] The vacuum degree in the sintering furnace is reduced to 2×10 -3 After Pa, flow H 2 Until the pressure in the furnace is stabilized at 1×10 5 After Pa, open the outlet valve and set H 2 The flow rate is kept at 150mL / min, and the temperature is first raised from room temperature to 500°C at a heating rate of 5°C / min;

[0065] Stop feeding hydrogen, and reduce the vacuum degree in the sintering furnace to 2×10 -3 After Pa, pass high-purity argon gas into the furnace, and the vacuum degree in the furnace rises to 1×10 5 After Pa, close the inl...

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Abstract

The invention provides a normal-pressure multi-step sintering method for powder metallurgy of a high-density Ti-Nb-Mo series alloy, and belongs to the technical field of alloys. According to the method, the multi-step sintering is carried out under normal pressure by adopting a temperature programming mode, and different protective atmospheres and gas flow rates are adopted at different temperature programming stages of the sintering, so that the capability of titanium hydride to improve the density of the powder metallurgy titanium alloy is maximally exerted, and the sintered titanium alloy is high in density and uniform and consistent in structure and performance. The results of the method show that the density of the Ti-Nb-Mo series alloy obtained by using the normal-pressure multi-stepsintering method can reach 99% or above, the average grain size is 30.2-39.7 microns, the yield strength of the alloy can reach 960 MPa, the compressive strength can reach 1287 MPa, and the criticalfailure strain is more than 0.7.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a powder metallurgy normal-pressure multi-step sintering method for high-density Ti-Nb-Mo alloys. Background technique [0002] With the expansion of titanium alloy application fields, the proportion of high melting point elements such as niobium and molybdenum in titanium alloy components has gradually increased, which has brought more difficulties to the powder metallurgy near-net shape manufacturing technology of titanium alloy workpieces, which is likely to cause powder metallurgy. Part density is low. At present, the process of preparing high-density titanium alloys by powder metallurgy mainly promotes the sintering and densification of titanium alloys by applying pressure at high temperatures. However, the hot pressing sintering method is easy to obtain a sintered body with fine grains, close to the theoretical density, and close to zero porosity, but it is not suitable for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/10B22F3/02C22C14/00
CPCB22F3/02B22F3/101C22C14/00B22F1/052
Inventor 蔡奇李蕙丛刘金旭李树奎贺川冯新娅吕延伟刘兴伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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