The infiltration technique is to infiltrate the porous workpiece by the infiltration agent pressure to achieve the purpose of filling the gap. It was first applied in ancient China, and the infiltration technique for modern industry can be traced back to the casting block in the 1930s. Leakage process, to the present, the application of organic infiltration and infiltration technology has become more and more extensive, from military to civilian, and more and more industries are beginning to apply. Let's take a look at it together:

1. Prevent micro-hole leakage of aluminum alloy casting parts of military aircraft:

The aircraft was successfully tested in 1905. It was applied in the First World War in 1914-1918. In 1939-1945, the World War II metal aircraft was widely used.

The aluminum alloy cast parts on the metal plane have micropores such as pinhole pores and shrinkage holes that are invisible to the eye during casting. These are due to the gas generated in the aluminum alloy during casting and the original gas in the mold moving around inside the material. And formed, or caused by cooling shrinkage during the molding process.

Different characteristics, such as pinholes, may cause leakage from the inside to the outside of the part. Liquids and gases such as lubricating oil, grease, cooling water, gasoline, air, and refrigerant gas for air conditioning inside the parts casing may leak. In addition, moisture or the like may be infiltrated from the outside, which may affect or even damage the function of the component.

Therefore, the impregnation treatment is required, and the impregnation treatment means that the liquid infiltrant is infiltrated into the inside of the micropores of the casting to be solidified, thereby preventing the phenomenon of leakage, oil leakage and the like of the parts. This infiltration technique was applied to this military industry in 1940.

Because the United States is an important production process for military production, the US military industry and military management departments have developed the infiltration standard. After several updates, the updated infiltration agent standard is MIL-I-17563C, which is still in use today. This standard. The standard for impregnation treatment is MIL-STD-276A, which is still in use today.

2. Military use for civilian use:

Later, in the automobile, motorcycle, train, ship, air-conditioning and other household appliances industry, water pump and pipe fittings and other hardware and other pressure-resistant castings and gears and electronic parts, powder metallurgy parts are also widely used, in the mass production process of pressure-resistant die-cast parts In general, about 8 to 50% of parts are leaked. If it is completely recast, it will cost a lot of money, so the infiltration is widely applied to private enterprises. Therefore, the impregnation treatment plays a key role in quality assurance and production cost reduction, and has become a very important production process.

3. Other applications:

It is also widely used in the insulation of electronic components and motor coils, and in the rust prevention of parts.

In addition, in improving the physical properties of the parts, such as improving the cutting performance of the parts to extend the service life of the cutting tools has also been applied.

In addition, the infiltration treatment is applied before the metal surface treatment such as electroplating, painting, and spray molding, which can improve the quality of electroplating, painting, and spray. The surface is smoother and does not cause spots and irregularities, and can extend the life of the parts.