Water cooling copper crucible directional freezing method for superhigh-temperature Nb-Si alloy

A technology of water-cooled copper crucible and directional solidification, which is applied in self-solidification, chemical instruments and methods, crystal growth, etc., can solve the problems of poor comprehensive physical and mechanical properties of alloys, difficult adjustment of microstructure, low efficiency of directional solidification, etc., and achieve excellent High temperature strength, high directional solidification efficiency, and the effect of reducing processing defects

Inactive Publication Date: 2014-04-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems existing in the existing directional solidification method that the metal is easy to be polluted, the directional solidification efficiency is low, the microstructure is difficult to adjust, and the comprehensive physical and mechanical properties of the alloy are poor, and then provide a cold crucible electromagnetic precise forming method. A water-cooled electromagnetic copper crucible directional solidification method for an ultra-high temperature Nb-Si-based alloy used in conjunction with a directional solidification device that can process ultra-high-temperature Nb-Si-based alloys

Method used

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  • Water cooling copper crucible directional freezing method for superhigh-temperature Nb-Si alloy
  • Water cooling copper crucible directional freezing method for superhigh-temperature Nb-Si alloy
  • Water cooling copper crucible directional freezing method for superhigh-temperature Nb-Si alloy

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specific Embodiment approach 1

[0018] Specific implementation mode one: combine figure 1 and figure 2To illustrate this embodiment, the specific steps of a water-cooled copper crucible directional solidification method for an ultra-high temperature Nb-Si-based alloy described in this embodiment are:

[0019] Step 1. Place the feeding rod 15, the base material 8, the water-cooled copper crucible 13 and the induction coil 12 in the furnace body 29 of the cold crucible electromagnetic precise forming and directional solidification device. The furnace body 29 is provided with the feeding rod 15 and the bottom Material 8, feeding rod 15 and bottom material 8 are provided with a water-cooled copper crucible 13, and the exterior of the water-cooled copper crucible 13 is provided with an induction coil 12, and the number of turns of the induction coil 12 is 3 to 5 turns;

[0020] Step 2, in the body of furnace 29, first vacuumize to 10 －3 ~1Pa, back flush with argon to 280~320Pa;

[0021] Step 3: After the feed...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment differs from Embodiment 1 in that the frequency of the single-phase alternating current fed in step 3 is 20 kHz. Such setting, such setting, can excite the alternating magnetic field and diffuse to the inside through the water-cooled copper crucible wall to generate the hot zone required for the processing process and meet the preparation requirements of directional solidification of Nb-Si-based alloys. Others are the same as in Embodiment 1

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the frequency of the single-phase alternating current fed in Step 3 is 50 kHz. With such arrangement, the alternating magnetic field can be excited and spread to the inside through the wall of the water-cooled copper crucible to generate the hot zone required for the processing process and meet the preparation requirements of directional solidification of Nb-Si-based alloys. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a water cooling copper crucible directional freezing method for a superhigh-temperature Nb-Si alloy, relates to a metal directional freezing method, in particular to a directional freezing method for the superhigh-temperature Nb-Si alloy, and aims at solving the problems of the existing directional freezing method that the metal is easy to be contaminated, the directional freezing efficiency is low, the structure form is not easy to adjust and the comprehensive mechanical property of the alloy is poor. The directional freezing method comprises the following main steps that 1. the interior of a furnace is provided with a loading rod and backing material, a water cooling copper crucible is arranged outside of the loading rod and the backing material, and an induction coil is arranged outside of the water cooling copper crucible; 2. the furnace is vaccumized firstly and then argon is introduced; 3. after the loading rod and the backing material are sent into the induction range of the induction coil, and single-phase alternating current is introduced to the induction coil so as to move the loading rod and the backing material downwards; and 4. when the material transmitting rod is moved downward and reaches the preset length, the material transmitting rod stops moving downward and the power applied to the induction coil is stopped. The method is applicable to preparing the superhigh-temperature Nb-Si alloy.

Description

technical field [0001] The invention relates to a metal directional solidification method, in particular to a directional solidification method of an ultra-high temperature Nb-Si base alloy. Background technique [0002] With the development of aerospace and other technologies, the requirements for high-temperature structural materials are getting higher and higher. The former U.S. Air Force Wright Laboratory proposed the IHPTET program in 1988 to stimulate research on advanced turbine engine material technology, aiming to double the thrust-to-weight ratio of the turbine engine produced at that time. The thrust-to-weight ratio of a new generation of aero-engine requires more than 15, and the temperature at the front inlet of the turbine reaches 1800-2050°C. There are two ways to increase the thrust-to-weight ratio of the turbine engine: increase the thrust and reduce the density of the turbine structural material. [0003] The main way to increase the thrust is to increase ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/00B22D27/04C30B11/00C30B29/52
Inventor 丁宏升燕云程王永喆陈瑞润郭景杰傅恒志
Owner HARBIN INST OF TECH
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