Dynamic determination method of hydrogen partial pressure of aluminum alloy melt

A technology for dynamic measurement of aluminum alloy melts, which is applied in the field of metallurgy and casting, can solve problems affecting test speed, etc., and achieve the effects of improving test efficiency, eliminating the need for hydrogen charging, and shortening test time

Inactive Publication Date: 2012-02-15
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to accurately measure the hydrogen partial pressure, there must be enough test time to ensure that the hydrogen in the melt is fully diffused out, which directly affects the test speed

Method used

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  • Dynamic determination method of hydrogen partial pressure of aluminum alloy melt
  • Dynamic determination method of hydrogen partial pressure of aluminum alloy melt
  • Dynamic determination method of hydrogen partial pressure of aluminum alloy melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The dynamic measurement method of the hydrogen partial pressure of the aluminum alloy melt first uses the vacuum pump to make the vacuum chamber into a vacuum state, inserts the probe into the molten aluminum, opens the valve between the probe and the vacuum chamber, starts the reducer unit, and continuously reduces the vacuum of the hydrogen measurement system. The volume of the chamber is used to gradually reduce the vacuum in the system, and the hydrogen partial pressure of the melt is dynamically measured. The test condition of this method is to ensure that the vacuum system is highly airtight (that is, no air leakage), and the displacement speed of the vacuum chamber must be determined, that is, the pressure at each moment in the vacuum chamber must be calculable. As shown in accompanying drawing 1, the length of the vacuum chamber can vary between 0-1, assuming that the pressure of the vacuum chamber at a certain moment is P 1 , the volume is changed at a constant...

Embodiment 2

[0021] In the method for dynamic measurement of hydrogen partial pressure of aluminum alloy melt described in Example 1, the process of using a vacuum pump to bring the vacuum chamber into a vacuum state refers to: expanding the variable volume vacuum chamber to the maximum volume, opening the gap between the vacuum chamber and the vacuum pump. valve, close other valves, the sensor starts to work at this time, the vacuum pump evacuates the vacuum chamber, and the vacuum degree reaches 10 3 Pa level, close all valves so that the pressure in the vacuum chamber can quickly approach the hydrogen partial pressure of the melt.

[0022] In the process of increasing the pressure in the vacuum chamber, the dynamic measurement of the hydrogen partial pressure of the melt refers to the dynamic monitoring of the actual pressure value in the chamber and the real-time calculation of the theoretical pressure value and the difference between the actual pressure value and the actual pressure va...

Embodiment 3

[0024] In the method for dynamic determination of the hydrogen partial pressure of aluminum alloy melt, the vacuum pump is a vacuum pump 1 that can achieve the initial vacuum degree required by the test experiment, and the vacuum pump is connected to a variable-capacity vacuum chamber 2 whose volume is changed by a deceleration unit, The vacuum chamber and the detected aluminum melt are connected by a probe 5, and the vacuum chamber is also equipped with an isolation unit 6 to prevent the aluminum alloy melt from being sucked into the vacuum chamber after the probe is damaged. It is directly connected to the pressure transmitter, and the signals output by the pressure sensor 7 and the temperature sensor 8 installed on the vacuum chamber are sent to the data acquisition and processing unit 10 .

[0025] The data acquisition and processing unit includes a signal conditioning circuit, an analog / digital conversion module, a serial communication interface and an industrial control c...

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Abstract

Dynamic measurement method of hydrogen partial pressure in aluminum alloy melt. Hydrogen in aluminum and aluminum alloys has a significant impact on mechanical properties such as plasticity, toughness, fatigue life, and stress corrosion resistance. The scrap rate caused by excessive hydrogen content accounts for about Half of all aluminum casting scrap. For this reason, people adopt various methods to refine the aluminum melt in the production process of aluminum castings to reduce the hydrogen content in the aluminum melt. In the present invention, a vacuum pump is used to make the vacuum chamber enter a predetermined vacuum state, the probe is inserted into the aluminum liquid, the valve between the probe and the vacuum chamber is opened, the reducer unit is started, and the volume of the vacuum chamber in the hydrogen measuring system is continuously reduced to make the The degree of vacuum gradually decreases, and the hydrogen partial pressure of the melt is measured during the pressure change process in the vacuum, that is, the hydrogen partial pressure of the melt is dynamically measured. The invention is used for accurately measuring the hydrogen content in the aluminum melt before pouring.

Description

Technical field: [0001] The invention belongs to the inventions and creations in the field of metallurgy and casting, and specifically proposes a new method for rapidly measuring hydrogen partial pressure of aluminum alloy melts. Background technique: [0002] Studies have shown that hydrogen in aluminum and aluminum alloys has a significant impact on mechanical properties such as plasticity, toughness, fatigue life, and stress corrosion resistance. The scrap rate caused by excessive hydrogen content accounts for about half of all aluminum casting scraps. For this reason, people adopt various methods to refine the aluminum melt in the production process of aluminum castings to reduce the hydrogen content in the aluminum melt. Obviously, accurate determination of the hydrogen content in the aluminum melt before casting is of great significance for controlling the quality of the casting and evaluating the effect of the degassing process. [0003] At present, there are many me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/14G01N33/20
Inventor 李大勇孙谦王利华张建雷
Owner HARBIN UNIV OF SCI & TECH
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