Method for preparing Ni3A1-based rhenium-contained moncrystal alloy with liquid metal cooling method

A liquid metal cooling and single crystal-based technology, applied in the field of alloys, can solve problems such as easy formation of freckles and small-angle grain boundaries, uneven structure of castings, and decreased heat dissipation efficiency, so as to reduce dendrite spacing and achieve high success rate. The effect of inhibiting precipitation

Active Publication Date: 2011-07-20
BEIHANG UNIV
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Problems solved by technology

However, as the casting is pulled out from the heat preservation area, the heat dissipation gradually becomes mainly radiation, and the heat dissipation efficiency drops rapidly, resulting in a continuous decrease in the temperature gradient at the solidification front. High segregation can easily lead to precipitation of TCP phase
Especially for the production of large-size gas turbine blades (>60mm), the above-mentioned shortcomings of the HRS method are very prominent

Method used

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  • Method for preparing Ni3A1-based rhenium-contained moncrystal alloy with liquid metal cooling method
  • Method for preparing Ni3A1-based rhenium-contained moncrystal alloy with liquid metal cooling method
  • Method for preparing Ni3A1-based rhenium-contained moncrystal alloy with liquid metal cooling method

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preparation example Construction

[0034] The preparation of the metal tin: heating the raw material high-purity tin to the melting point temperature (232° C.) to make it liquid, and then pouring it into the liquid metal cooling tank 1. The surrounding of the liquid metal cooling tank 1 is heated by vacuum pump oil so that the temperature of the cooling tank is 250-250 ° C. 300 ° C, so that the metal tin remains liquid. The vacuum pump oil is preferably VM100 vacuum pump oil.

[0035] The second step: preparation of Ni containing rhenium 3 Al-based alloy test rod;

[0036] (1) will prepare Ni containing rhenium 3 Raw materials for Al-based alloys: high-purity nickel (Ni), high-purity aluminum (Al), high-purity molybdenum (Mo) and high-purity rhenium (Re) by weight percentage: 7-8wt% Al, 8-13% Mo, 0.0005 ~3wt% Re, and the rest is Ni for weighing, when the Ni containing rhenium is to be prepared 3 When there is more than one Dy, Y or Hf in the Al-based alloy, the components are weighed according to the weight...

Embodiment 1

[0048] A rhenium-containing Ni 3 The preparation method of Al-based single crystal alloy mainly comprises the following steps:

[0049] The first step: preparing liquid metal cooling medium;

[0050] The liquid metal cooling medium is gallium indium alloy. The preparation of the gallium-indium alloy: the raw materials high-purity gallium (Ga) and high-purity indium (In), by weight percentage: gallium 10wt%, the rest is indium, weighed, put into a beaker and heated to 80 ° C to make it After the reaction is liquid, it is poured into the liquid metal cooling tank 1 as a cooling medium, and the surrounding of the liquid metal cooling tank 1 is heated by vacuum pump oil to maintain the temperature of the cooling tank at 15°C, so that the gallium-indium alloy remains liquid;

[0051] The second step: preparation of Ni containing rhenium 3 Al-based alloy test rod;

[0052] (1) will prepare Ni containing rhenium 3 Raw materials for Al-based alloys: high-purity nickel (Ni), high-...

Embodiment 2

[0063] A rhenium-containing Ni 3 The preparation method of Al-based single crystal alloy specifically comprises the following steps:

[0064] The first step: preparing liquid metal cooling medium;

[0065] The liquid metal cooling medium is gallium indium alloy or metal tin. The preparation of the gallium-indium alloy: the raw materials high-purity gallium (Ga) and high-purity indium (In), by weight percentage: gallium 30wt%, the rest is indium, weighed, put into a beaker and heated to 200 ° C to make it After the reaction is liquid, it is poured into the liquid metal cooling tank 1 as a cooling medium, and the surrounding of the liquid metal cooling tank 1 is heated by vacuum pump oil to maintain the temperature of the cooling tank at 18°C, so that the gallium-indium alloy remains liquid;

[0066] The second step: preparation of Ni containing rhenium 3 Al-based alloy test rod;

[0067] (1) will prepare Ni containing rhenium 3 Raw material of Al-based alloy: 7.5wt% Al, 11...

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Abstract

The invention provides a method for preparing Ni3A1-based rhenium-contained moncrystal alloy with a liquid metal cooling method, which concretely comprises the following steps of: firstly, preparing a liquid metal cooling medium; secondly, preparing a Ni3A1-based rhenium-contained alloy coupon; and thirdly, preparing a Ni3A1-based rhenium-free alloy seed crystal and the like. In the method, liquid metal (such as gallium and indium alloy or tin) is used as the cooling medium so that the cooling speed of a casting and the temperature gradient (200-350 K / cm) of a solid and liquid interface are increased; and a Ni3A1-based rhenium-contained moncrystal high-temperature alloy with small primary dendrite arm spacing, uniform tissues and low segregation is prepared with a seed crystal method through changing solidification process parameters such as heating temperature, pulling rate and the like, thereby obtaining Ni3A1-based rhenium-contained moncrystal alloy with excellent mechanical property.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a method for preparing rhenium-containing Ni by adopting a liquid metal cooling method. 3 Al-based single crystal alloy method. Background technique [0002] Ni 3 The melting point of Al intermetallic compound is 1395°C, it has high high temperature strength, creep resistance and high specific strength, and the yield strength has a positive temperature effect below the peak temperature, single crystal Ni 3 Al has high plasticity, but polycrystalline Ni 3 Al is brittle. Therefore consider Ni 3 Al-based alloys may break through the service temperature of existing nickel-based alloys. [0003] At present, in the industrial fields of power, petrochemical, transportation, especially aviation and aerospace, the engine is required to have a higher thrust-to-weight ratio and work efficiency, which requires the engine to have a higher operating temperature. The commonly u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B15/00
Inventor 徐惠彬汤林志宫声凯
Owner BEIHANG UNIV
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