This is an article introducing the Substrate Support Mat seal design. The article mainly shares three considerations in the Substrate Support Mat seal design. Next, let's go and see it with KY-Mat.

1. Substrate Support Mat sealing material

The sealing material should meet the requirements of sealing function. Due to the different media sealed by the Substrate Support Mat and the different working conditions of the equipment, the sealing materials are required to have different suitability. The requirements for sealing materials are:

①Substrate Support Mat material has good compactness and is not easy to leak medium;

② have appropriate mechanical strength and hardness;

③ Good compressibility and resilience, and small permanent deformation of Substrate Support Mat material;

④Substrate Support Mat material does not soften or decompose at high temperature, nor harden or brittle at low temperature;

⑤ Good corrosion resistance, Substrate Support Mat material can work for a long time in acid, alkali, oil, and other media, its volume-hardness change is small, and it does not adhere to the metal surface;

⑥ Small friction coefficient and good wear resistance;

⑦ It has the flexibility to be fully attached to the sealing surface;

⑧Good aging resistance, Substrate Support Mat material is durable;

⑨ It is easy to manufacture, cheap, and easy to obtain.

Obviously, it is impossible for any one material to fully meet the above requirements, but materials with excellent sealing properties can meet most of the above requirements of Substrate Support Mat.

Rubber is the most commonly used sealing material. In addition to rubber, graphite tape, PTFE and various sealants are suitable for sealing materials.

2. Substrate Support Mat Processing Technology

Good processing technology and molding technology are effective means to ensure the dimensional accuracy, and surface characteristics and improve the resistance and wear resistance of the Substrate Support Mat. Processes related to Substrate Support Mat sealing include molding, dipping, spraying, sintering, welding, electroplating, and surface heat treatment. For the same material, if the processing technology is different, the properties of the Substrate Support Mat will be very different. As far as the most commonly used molding process in the manufacture of seals is concerned, if the extruded product has a large error in shape and size, and there are flashes and burrs on the parting surface, it is very unfavorable for sealing. Taking the rubber O-ring as an example, it is sealed by a given amount of compression deformation. If the necessary amount of compression deformation cannot be guaranteed due to poor dimensional accuracy, leakage will occur. In addition, since the O-ring is installed on the sealing part in a pre-stretched state when the motion friction heats up, the O-ring does not expand, but contracts (the rubber in the stretched state shrinks due to heat, which is called the Joule effect), which is also known as the Joule effect. The amount of compression deformation during operation may be reduced and leakage may occur. Therefore, the dimensional accuracy must be strictly controlled in the design, and various influencing factors, such as the dimensional accuracy, surface roughness, and grain direction of the parts in contact with the Substrate Support Mat, should be considered.

3. Substrate Support Mat Friction, Wear, and Lubrication

Friction and wear are inevitable problems in contact-type dynamic seals. The Substrate Support Mat of the contact type dynamic seal is in contact with the sealed part, and friction occurs due to relative movement, which leads to heat generation and wears of the surface of the parts, which is the main cause of leakage and damage to the seal. Therefore, the selection of lubricating hydraulic pressure and lubricant has become a problem that must be carefully considered in the design of the Substrate Support Mat. Self-lubricating methods are generally selected, such as fillers impregnated with various lubricants, impregnated graphite, and polytetraethylene with a small friction coefficient. When the medium has lubricity, it is lubricated by the medium itself.