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A kind of niobium silicon carbide reinforced nb-based superalloy and its preparation method

A superalloy and alloy technology, which is applied in the field of superalloy materials and powder metallurgy to achieve the effects of high temperature resistance, simple process and excellent mechanical properties.

Active Publication Date: 2020-01-10
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, mechanical alloying plus in-situ reaction high temperature hot pressing sintering is used to generate Nb 3 SiC 2 There is no report on the study of reinforced Nb-based superalloy materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Nb powder, Si powder and graphite powder with a purity of not less than 99.9% are selected as the main raw materials, and the particle size of Nb powder and graphite powder is required to be ≤100 μm, and the particle size of Si powder is ≤30 μm. According to the mass ratio of Nb:Si:C=0.89:0.08:0.03, put Nb powder, Si powder and graphite powder into a high-energy ball mill tank, fill it with argon gas and carry out mechanical alloying, and the ball mill time is 20h to obtain a mixed powder body. Among them, during ball milling, the ball-to-material ratio is 10:1, the rotating speed is 400r / min, and the machine is shut down for cleaning every 20 minutes.

[0024] (2) Take out the mixed powder and put it into a graphite mold for hot-press sintering, heat up from room temperature to a sintering temperature of 1500°C at a heating rate of 10°C / min, keep sintering at the sintering temperature for 60min, and vacuum during the sintering process ≤10 -2 Pa, the pressure is 40...

Embodiment 2

[0027] (1) Nb powder, Si powder and graphite powder with a purity of not less than 99.9% are selected as the main raw materials, and the particle size of Nb powder and graphite powder is required to be ≤100 μm, and the particle size of Si powder is ≤30 μm. According to the mass ratio of Nb:Si:C=0.66:0.27:0.07, put Nb powder, Si powder and graphite powder into a high-energy ball mill tank, fill it with argon gas and carry out mechanical alloying, and the ball mill time is 40h to obtain a mixed powder body. Among them, during ball milling, the ball-to-material ratio is 10:1, the rotating speed is 400r / min, and the machine is shut down for cleaning every 20 minutes.

[0028] (2) Take out the mixed powder and put it into a graphite mold for hot-press sintering, heat up from room temperature to a sintering temperature of 1700°C at a heating rate of 10°C / min, keep sintering at the sintering temperature for 180min, and vacuum during the sintering process≤10 -2 Pa, the pressure is 40...

Embodiment 3

[0031] (1) Nb powder, Si powder and graphite powder with a purity of not less than 99.9% are selected as the main raw materials, and the particle size of Nb powder and graphite powder is required to be ≤100 μm, and the particle size of Si powder is ≤30 μm. According to the mass ratio of Nb:Si:C=0.80:0.15:0.05, put the Nb powder, Si powder and graphite powder into the high-energy ball mill tank, fill it with argon gas and carry out mechanical alloying. The ball mill time is 20h to obtain the mixed powder body. Among them, during ball milling, the ball-to-material ratio is 5:1, the rotating speed is 250r / min, and the machine is shut down for cleaning every 40 minutes.

[0032] (2) Take out the mixed powder and put it into a graphite mold for hot-press sintering, heat up from room temperature to a sintering temperature of 1600°C at a heating rate of 8°C / min, keep sintering at the sintering temperature for 100min, and vacuum during the sintering process ≤10 -2 Pa, the pressure is...

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Abstract

The invention provides a Nb3SiC2 reinforced Nb-based high temperature alloy and a preparation method thereof. Nb powder, Si powder and graphite powder are selected as main raw materials. The particlesizes of the Nb powder and the graphite powder are required to be less than or equal to 10[mu]m, and the particle size of the Si powder is required to be less than or equal to 30[mu]m. The Nb powder,the Si powder and the graphite powder are placed in a high-energy ball grinding pot, and after argon gas is filled, mechanical alloying is carried out for 20-40 hours; the mixed powder is taken out for hot pressing and sintering in a graphite mold at a sintering temperature of 1500 -1700 DEG C, the heating rate is 5-10 DEG C per minute, the vacuum degree is less than or equal to 10-2 Pa, the pressure is 40-50 MPa, the temperature at the maximum sintering temperature is kept for 60-180 minutes, and the Nb3SiC2 reinforced Nb-based high temperature alloy produced by in-situ reaction is obtained with furnace cooling. The process for preparing the Nb3SiC2 reinforced Nb-based high temperature alloy is simple and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of superalloy materials and powder metallurgy, and relates to a kind of Nb 3 SiC 2 Reinforced Nb-based superalloy and its preparation method. Background technique [0002] In modern advanced aero-engines, the amount of high-temperature alloy materials accounts for 40% to 60% of the total amount of the engine. In aero-engines, high-temperature alloys are mainly used in the four hot parts of the combustion chamber, guide vanes, turbine blades and turbine disks. High temperature oxidation performance. [0003] At present, the high-temperature structural materials widely used in turbine engines, jet engines and heat exchangers are nickel-based superalloys, but the current service temperature of nickel-based superalloys (~1100°C) has reached 85% of its melting point, that is, Nickel-based superalloys have been difficult to meet the requirements of further increasing the operating temperature of the system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C27/02C22C32/00B22F9/04B22F3/14
CPCB22F3/14B22F9/04B22F2009/041B22F2009/043B22F2998/10C22C1/058C22C27/02C22C32/0089
Inventor 李文虎艾桃桃董洪峰冯小明
Owner SHAANXI SCI TECH UNIV