Device and method for measuring infiltration characteristic of vacuum air-pressure infiltration method

A technology of vacuum air pressure and vacuum pumping device, which is applied in the field of measurement and can solve the problems of fast impregnation speed and difficult measurement

Inactive Publication Date: 2014-11-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the vacuum and high temperature state, under the action of gas pressure, the impregnation process of liquid metal inside the preform takes place in a short time and at a high speed. In order to solve the problem of qualitative research on the infiltration characteristics of the air pressure infiltration method, the present invention provides a device and method for measuring the infiltration characteristics of the vacuum air pressure infiltration method, which can solve the problem that the infiltration speed is fast and difficult to measure under the condition of air pressure, so that Able to quantitatively analyze the basic laws of critical infiltration pressure of liquid metal in porous media

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Embodiment 1

[0026] Refer to attached figure 1 , The device for measuring the infiltration characteristics of the vacuum pressure infiltration method in this embodiment includes an infiltration device, a heating control device, a vacuum device 13, a gas storage tank 11, a gas flow control device 12 and a data acquisition device.

[0027] The infiltration device includes a crucible 4, a seepage chamber cover 1, an infiltration chamber 5 and a collar 6; a flange 3 is fixedly welded to the mouth of the crucible, and a metal graphite winding pad 2 is placed between the flange and the seepage chamber cover , in order to play a sealing role, the flange plate and the seepage chamber cover are fixedly connected by fastening bolts 8 . The infiltration chamber is a cylindrical shell structure with openings at both ends. The infiltration chamber is installed in the crucible. One end of the infiltration chamber is connected to the cover of the infiltration chamber through a quick joint 9. The quick jo...

Embodiment 2

[0035] In this embodiment, the device for measuring the infiltration characteristics of the vacuum air pressure infiltration method is the same as that in Example 1, and the method steps for measuring the infiltration characteristics of the vacuum air pressure infiltration method are:

[0036] Step 1: Prepare a prefabricated body whose shape can be attached to the inner wall of the infiltration chamber. In this embodiment, a cylindrical preformed body with a diameter equal to the diameter of the infiltration chamber is prepared; the preformed body is inserted into the end of the infiltration chamber near the bottom of the crucible, And the inner wall of the impregnation chamber attached to the preform is coated with graphite powder to ensure that the preform is closely attached to the inner wall of the impregnation chamber, and the position of the preform in the impregnation chamber corresponds to the installation position of the collar, so as to facilitate The thermocouple in ...

Embodiment 3

[0040] In this embodiment, the device for measuring the infiltration characteristics of the vacuum air pressure infiltration method is the same as that in Example 1, and the method steps for measuring the infiltration characteristics of the vacuum air pressure infiltration method are:

[0041] Step 1: Prepare a prefabricated body whose shape can be attached to the inner wall of the infiltration chamber. In this embodiment, a cylindrical preformed body with a diameter equal to the diameter of the infiltration chamber is prepared; the preformed body is inserted into the end of the infiltration chamber near the bottom of the crucible, And the inner wall of the impregnation chamber attached to the preform is coated with graphite powder to ensure that the preform is closely attached to the inner wall of the impregnation chamber, and the position of the preform in the impregnation chamber corresponds to the installation position of the collar, so as to facilitate The thermocouple in ...

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Abstract

The invention provides a device and a method for measuring infiltration characteristics of a vacuum air-pressure infiltration method; the device comprises an infiltration device, a heating control device, a vacuumizing device, a gas storage tank, an air flow control device and a data acquisition device, wherein the infiltration device comprises a crucible, a seepage cavity cover, an infiltration cavity and a lantern ring, the heating control device comprises a heating furnace and a temperature control instrument, the vacuumizing device comprises a vacuum pump and a pumping pipeline, and the data acquisition device comprises a data acquisition unit, a thermoelectric coupler and a pressure sensor; and the method comprises the following steps: placing a prefabricated body into the infiltration cavity, vacuumizing a seepage cavity and a smelting cavity by the vacuumizing device, then switching on the heating furnace to melt and infiltrated metal, and introducing inert gas to the smelting cavity in a controlled manner, so that a measurement experiment of the infiltration characteristics is realized. According to the invention, the air flow control device is adopted to slow down the infiltration speed of infiltrated molten metal in the prefabricated body under the action of the gas pressure, and solve the problems of inconvenience for controlling the seepage process and experimental data acquisition due to the rapid infiltrating process after gas introduction in the prior art.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a device and method for measuring the infiltration characteristics of a vacuum pressure infiltration method. Background technique [0002] At present, the preparation methods of metal matrix composites mainly include stirring method and infiltration method. The stirring method is generally suitable for independent reinforcements. Through stirring, the composition of the mixed metal liquid is as uniform as possible. Since the liquid metal changes from liquid to solid, it undergoes nucleation. , Crystallization, grain growth and other processes, the process has a large randomness, the microstructure is difficult to control, and defects such as shrinkage porosity, shrinkage cavity, segregation, and uneven grain size are unavoidable. The infiltration methods mainly include pressureless infiltration and pressure infiltration. The pressureless infiltration method is mainly suitab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 周计明谷雪花杨方徐乙人齐乐华
Owner NORTHWESTERN POLYTECHNICAL UNIV
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