Preparation equipment for high-throughput experiment samples

A high-throughput, sample-based technology, applied in the preparation of test samples, etc., can solve problems such as low efficiency, stretching, and long basic data cycle, and achieve the effect of simple structure and low cost

Active Publication Date: 2016-08-10
SHANGHAI UNIV
7 Cites 13 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Most of the traditional experiments to study the influence of process parameters on the solidification structure adopt the method of controlling a single variable to conduct experiments one by one. This kind of research method is too long to accumulate basic data, and the envi...
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Method used

Because the metal sample in the casting mold can produce serious interference to the distribution of the magnetic field, the magnetic field that causes the induction coil to produce can't be evenly distributed in an axisymmetric manner inside it, so the base with high magnetic flux is embedded in the bottom of the casting mold , the base has a stronger magnetic flux capacity than the specimen, which can guide and redistribute the magnetic field inside the mold.
The structure of casting mold and the strength of thermal conductivity can be known, and the outermost ring type wall of casting mold is owing to be in contact with air recently, and thermal conductivity is the best, weakens successively inwards, therefore can form certain from outside to inside under conventional conditions. temperature gradient. However, the distribution of the magnetic field intensity generated by the induction coil inside is just the opposite. It is the strongest near the mold wall and weakens in turn, so the heating effect on the experiment is also strong on the outside and weak on the inside. ...
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Abstract

The invention discloses preparation equipment for high-throughput experiment samples. The preparation equipment comprises an induction coil and the like. Automatic program control is carried out through a computer and a programmable controller, a mechanical pump is started for vacuum pumping, a gas inlet valve is opened to introduce high-purity argon or nitrogen, a medium-frequency induction power source is turned on to introduce medium-frequency current into the induction coil for induction heating, a rotary table is rotated in a forward-backward crossed mode, samples are stirred at a small angle, the medium-frequency induction power source is turned off after the samples are molten to be uniform, a single-pole double-throw switch is connected with a pulse power source, and the pulse power source is turned on for carrying out pulse magnetic field treatment on a sample solidification process; in the sample solidification process, the gas flow of the gas inlet valve and a gas outlet valve is accurately adjusted through temperature feedback of the programmable controller and a thermocouple, the cooling rate is controlled to be in the range of 10<-2>-10<2> K/s, and a batch of solidified samples with different ingredients and different cooling rates are obtained at a time. The preparation equipment can be used for rapidly screening optimal sample ingredients, solidification structures and technological parameters.

Application Domain

Preparing sample for investigation

Technology Topic

Nitrogen gasAdditive ingredient +19

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  • Preparation equipment for high-throughput experiment samples
  • Preparation equipment for high-throughput experiment samples

Examples

  • Experimental program(2)

Example Embodiment

[0022] Example 1
[0023] In this embodiment, austenitic stainless steel is used as the experimental material to calculate the relationship between composition-solidification structure-magnetic field strength. The specific process is as follows: the experimental casting mold is cylindrical, made of alumina, and the center axis is made of concentric circular shafts. 5 concentric circles, 12 crucibles are embedded in the same angle on each circle, the material of the crucible is alumina, such as figure 1 Shown. Divide the designed 12 kinds of austenitic stainless steel materials into 5 parts each, and put 12 kinds of austenitic stainless steel materials into the 12 crucibles on each concentric circle. The crucibles on the central axis of the 5 concentric circles at the same angle are Same raw materials. The temperature of each crucible is measured separately, and the austenitic stainless steel raw material is put into the crucible at the pre-designed position. Start the mechanical pump to evacuate (vacuum is 10-1Pa), open the intake valve and pass in high-purity argon or nitrogen, repeat twice, start the intermediate frequency induction power supply and introduce the intermediate frequency current into the induction coil for induction heating. After the sample is melted, Rotate the rotating table positively and negatively (speed of 0.1rad/s to stir the sample at a small angle (30 degrees), after the sample is evenly melted, keep it for 30 minutes until the temperature of the thermocouple in each crucible is the same, stop the intermediate frequency induction power supply, The double-throw switch turns on the pulse power supply, and starts the pulse power supply (current 1000A, frequency 120Hz, pulse width 1.2ms) for pulse magnetic field treatment (magnetic field strength of 0.5T) during the solidification process of the sample; The programming controller and thermocouple temperature feedback precisely adjust the gas flow of the outlet valve and inlet valve and pulse magnetic field intensity to control the cooling rate at 3K/s until the sample solidifies. Take the sample out of the crucible, mark the position and put it into the grinding and polishing tank Inside. Inlay, polish and corrode the grinding and polishing groove together with 60 samples, observe the macro and micro structure, and calculate the relationship between composition-solidification structure-magnetic field strength.

Example Embodiment

[0024] Example 2
[0025] In this embodiment, aluminum-copper alloy materials are used to calculate the relationship between composition-solidification structure-cooling strength. The specific process is as follows: the experimental casting mold is cylindrical, made of magnesia bricks, and the inner part is made of five concentric shafts with the central axis as the concentric shaft. Circle, each circle has 12 crucibles embedded in the same angle, the crucible material is quartz, such as figure 1 Shown. Divide the designed 12 kinds of aluminum-copper alloy raw materials into 5 parts each. The 12 crucibles on each concentric circle correspond to the 12 kinds of aluminum-copper alloy raw materials. The 5 concentric circles on the central axis and the crucibles at the same angle are of the same kind. raw material. The temperature of each crucible is measured separately, and the aluminum-copper alloy raw materials are put into the crucible at the pre-designed position. Start the mechanical pump to evacuate (the vacuum degree is 10-1Pa), open the intake valve and pass in high-purity argon or nitrogen, repeat 3 times, start the intermediate frequency induction power supply and introduce the intermediate frequency current into the induction coil for induction heating. After the sample is melted, Rotate the rotating table positively and negatively (speed 0.2rad/s to stir the sample at a small angle (20 degrees), after the sample is evenly melted, keep it for 30 minutes until the temperature of the thermocouple in each crucible is the same, stop the intermediate frequency induction power supply, The double-throw switch turns on the pulse power supply and starts the pulse power supply (current 1500A, frequency 200Hz, pulse width 0.6ms) for pulse magnetic field treatment (magnetic field strength of 1T) during the solidification of the sample; during the solidification of the sample, programmable The controller and thermocouple temperature feedback precisely adjust the gas flow rate of the outlet valve and inlet valve and pulse magnetic field intensity to control the cooling rate at 1K/s until the sample solidifies. Take the sample out of the crucible, mark the position and put it into the grinding and polishing tank .
[0026] Inlay, polish, and corrode the grinding and polishing groove together with 60 samples, observe the macro and micro structure, and calculate the relationship between composition-solidification structure-cooling strength.
[0027] The invention can be used to prepare a large number of different (magnetic field strength, sample material and composition) magnetic field solidified or heat-treated metal samples at the same time. The invention is mainly composed of induction coils and special casting molds. The induction coil is a magnetic field generating system, and the special casting mold is a whole The material processes multiple molds with the same size inside. First, add the samples of different components to be prepared into the special mold and place them inside the coil. Pass high-frequency current through the induction coil to heat the sample. After the sample reaches the required temperature, apply different forms of current for magnetic field treatment. The invention provides a method for rapidly preparing a large number of magnetic field solidification or heat treatment samples, and can be used for the preparation of samples for metal solidification or heat treatment processes.

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Description & Claims & Application Information

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