The infiltrant is divided into an inorganic infiltrant and an organic infiltrant. The inorganic infiltrant is composed of several inorganic substances such as sodium silicate. Impregnant Sealant is a liquid substance prepared from dozens of organic substances. A casting or powder metallurgy that is used to seal a microporous defect. The first use of inorganic impregnation agent for infiltration treatment (Metal Impregnation), and later developed an organic infiltration agent, due to many advantages, many companies use organic infiltration agents instead of inorganic infiltration agents, organic infiltration agents through After 3 upgrades, the 2nd and 3rd generation organic infiltrants are widely used. Due to the poor impregnation effect of the inorganic infiltrant, the use is greatly reduced, but the cost of eliminating the infiltration equipment and the infiltrant is high. Therefore, some enterprises in China and some developing countries still use inorganic infiltration agents, and with the development of social economy, the use of inorganic infiltration agents will be gradually reduced.

Inorganic casting impregnating trapping agent (inorganic casting sealant) is more resistant to heat than organic casting impregnating sealant. Therefore, in some cases, it cannot be impregnated with organic castings, and the trapping agent replaces inorganic casting sealant. Insulating agents have many other informal names, such as casting trapping agent castings, etc., because many manufacturers do not come into contact with infiltration and trapping, so there are many other names such as casting trapping glue, casting sealant, casting sealant and so on.

First, the performance and requirements of the infiltration agent (impregnation liquid):

1. Basic performance requirements of infiltration agent:

It has good permeability to casting defects, and the infiltrant should also have non-toxic, non-polluting, non-flammable and good stability properties. When the infiltrant is cured, it should form a solid whole with the casting. The infiltrant cured product has good heat resistance, acid and alkali corrosion resistance, solvent resistance, irreversibility (will not change the infiltrant liquid or paste) and Mechanical properties closer to the substrate.

2. New performance requirements for infiltration agents:

In addition to the above basic requirements, since infiltration has become a key production process for many factories, it is necessary to have good performance in terms of impregnation efficiency, energy saving and consumption reduction. Specifically,

New requirements 1. Easy to clean: Residual infiltrant is removed within 3 minutes, including residues in the screw holes.

New requirements 2, short curing time: 10 minutes to complete the curing.

New requirements 3, less consumption of infiltration agent: less residual infiltration agent on the workpiece.

Second, the latest generation of organic infiltration agents (3 generations):

In order to meet the above three new requirements, the third generation of organic infiltration agent was developed in Japan in 1992. It is the latest and best, and there are few manufacturers. Many well-known large enterprises are using it, which fully meets the above three new requirements. .

Comparison of third and third generation organic infiltration agents and inorganic infiltration agents:

Taking the third-generation organic infiltration agent IMPRETECH YJ-85C as an example, the YJ-85C was successfully developed and put into commercial use during its work in Japan in 1992.

In summary, although the inorganic infiltrant is 10 times cheaper than organic, the overall cost of inorganic infiltration is large, but the heat-resistant parts with a working temperature of 250 ° C to 300 ° C for a long time can only be infiltrated with inorganic infiltration. . In other cases, especially in mass production, organic infiltration should be used.

The name of the impregnating agent: In China, the name of the infiltrant can be called a variety of patterns, such as casting pore sealing agent, casting shrinkage hole loosening agent, casting shrinkage cavity leakage, casting trapping glue, casting pinhole sealing glue, Casting pores to seal the glue and so on.