Aluminum liquid hydrogen analyzer

1Aluminum liquid hydrogen analyzerPrinciple Introduction:

Design based on the vacuum solidification test method. Using vacuum pumping technology to rapidly precipitate hydrogen in liquid samples, after the sample solidifies, the hydrogen content of the aluminum liquid can be determined by comparing the surface quality of the sample with the standard sample to determine whether it meets the requirements. The actual specific gravity of the test block can also be calculated and compared with the standard specific gravity to determine whether the aluminum liquid meets the requirements.

Due to the fact that aluminum liquid solidifies in vacuum, the entire solidification process is not affected by external air, and the hydrogen content measured in the sample is the hydrogen content at the time of crucible sampling. The equipment has accurate detection, reliable operation, easy operation, and maintenance

1Aluminum liquid hydrogen analyzerPrinciple Introduction:

Design based on the vacuum solidification test method. Using vacuum pumping technology to rapidly precipitate hydrogen in liquid samples, after the sample solidifies, the hydrogen content of the aluminum liquid can be determined by comparing the surface quality of the sample with the standard sample to determine whether it meets the requirements. The actual specific gravity of the test block can also be calculated and compared with the standard specific gravity to determine whether the aluminum liquid meets the requirements.

Due to the fact that aluminum liquid solidifies in vacuum, the entire solidification process is not affected by external air, and the hydrogen content measured in the sample is the hydrogen content at the time of crucible sampling. The equipment has accurate detection, reliable operation, easy operation, and maintenance

Conduct qualitative analysis on the quality of aluminum liquid and preliminarily determine the quality of aluminum liquid.

Reduced pressure solidification is the process of observing the precipitation of bubbles during the cooling and solidification of aluminum liquid samples under reduced pressure (a certain degree of vacuum) conditions (or comparing the cross-sectional shape and porosity of the sample with a standard sample; or determining the hydrogen content in the aluminum liquid based on the ratio of the density of the sample to the true density of the alloy). This method is simple, fast, and suitable for most aluminum casting manufacturers to apply.

During the experiment, carefully take a small amount of molten aluminum from the center of the prepared die casting（A sample weighing around 100g is tested. The sample is poured into a preheated crucible (steel crucible must be coated with release agent) and immediately (less than 30 seconds) placed in a vacuum chamber. After connecting to a vacuum pump and sealing the vacuum chamber, it is quickly evacuated to a certain degree of vacuum. At a certain degree of vacuum, gas dissolved in the aluminum liquid begins to precipitate, escaping from the surface of the melt and forming bubbles inside the sample. And protrusions can be seen on the surface of the sample.

3、 Hazards to castings

A large amount of gas dissolved in liquid state. Due to the presence of hydrogen, aluminum castings are prone to defects such as pinholes and pores, which greatly reduce the mechanical properties and internal quality of the castings; For this reason, various methods are used in the production process of aluminum castings to refine and remove gas from the aluminum liquid, in order to reduce the hydrogen content in the aluminum liquid and prevent the occurrence of casting defects. Therefore, how to qualitatively or quantitatively determine the hydrogen content in the aluminum liquid before pouring in a simple, direct, and rapid manner to ensure the production of qualified castings has always been a research hotspot for scholars at home and abroad.

The combined use effect of four degassing machines

The function of the aluminum liquid degassing machine is to stir the aluminum liquid through a controlled rotating graphite shaft and rotor, while injecting the measured inert gas into the aluminum liquid through the rotor and dispersing it into small bubbles, so that they are evenly dispersed in the molten metal, and the gas partial pressure of the bubbles is zero. Due to the high hydrogen partial pressure in the aluminum liquid, the hydrogen gas in the aluminum liquid continuously diffuses into the bubbles. At the same time, some non-metallic inclusions in the aluminum liquid are adsorbed on the surface of the bubbles, and useless hydrogen gas and some non-metallic inclusions adhere to the inert gas bubbles that float to the liquid surface. Then, the purpose of removing hydrogen and oxide inclusions is achieved by skimming.

It can be used to easily and quickly determine the degassing effect of aluminum liquid, meeting the requirements of simple, convenient, and fast detection in the casting process.