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• 07

  2022-04

  Factors affecting the heat resistance of glass

  (1) Expansion coefficient It can be known from the calculation formula of heat resistance of glass: heat resistance is inversely proportional to the coefficient of expansion. There···

• 14

  2022-01

  Insulation properties of ceramics

  Generally speaking, insulating ceramics are multiphase polycrystalline materials obtained by molding and sintering powder raw materials. The microstructure of ceramics can be mainl···

• 21

  2021-12

  The main properties of PEEK (polyether ether ketone)

  PEEK is a kind of crystalline high temperature resistant thermoplastic engineering plastic with excellent comprehensive performance, and it is also a kind of polyaryletherketone po···

• 17

  2021-12

  Requirements for metals and their alloys that can be connected to glass

  In the production of electronic devices, there are many types of metals that are often connected to glass, but not all metals can form connectors with glass. The metal that can for···

• 18

  2021-11

  Principles and characteristics of brazing

  Brazing is to use a metal material with a lower melting point than the base material as the brazing filler metal. The weldment and the brazing filler metal are heated to a temperat···

• 28

  2021-09

  Features of ceramic connection

  Due to the essential difference between the atomic structure of ceramic materials and metals, coupled with the special physical and chemical properties of the ceramic itself, there···

• 31

  2021-08

  Purification and surface treatment of metal sealing parts

  The surface condition of the metal has a great influence on the quality of the sealing. Therefore, the metal parts must be purified and heat treated before sealing to remove the oi···

• 25

  2021-08

  Requirements for metal materials in glass sealing

  Glass and metal sealing parts are widely used in the manufacture of various electric vacuum devices. In order to ensure the reliability of the electric vacuum device, the glass and···

• 23

  2021-08

  Glass sealing requirements for glass

  The good sealing of glass and other materials and the performance of the sealing products depend to a large extent on the performance of the sealing glass. Therefore, before sealin···

• 20

  2021-08

  Basic principles of glass sealing

  Glass and other materials are two materials with fundamentally different properties. There are many basic requirements if they are to be tightly combined. For a selected other mate···

• 03

  2021-06

  Inhalation and deaeration of solids

  In the atmospheric state or in the low vacuum area, when the solid is in contact with the gas, air will be sucked on the surface and inside of the solid. In the high vacuum area, t···

• 30

  2021-05

  Advantages and disadvantages of plastic

  advantage: 1. Lightweight Plastics are generally lighter, with a density in the range of 0.83~2.3g/cm3, which is only 1/7~1/4 of steel and 1/2 of aluminum. This is very beneficial ···

• 28

  2021-05

  The nature and influencing factors of thermal expansion coefficient

  The phenomenon that the volume or length of an object increases with the increase in temperature is thermal expansion. The coefficient of thermal expansion is a physical quantity u···

• 21

  2021-05

  Gas insulation properties of sulfur hexafluoride(SF6)

  Sulfur hexafluoride (SF6) gas only began to be used as an insulating medium and arc extinguishing medium in certain electrical equipment (first of all, circuit breakers) in the 196···

• 14

  2021-05

  Common materials in vacuum systems

  Part nameLow vacuum and high vacuumUltra-high vacuumHousing, pipelines, valves, internal partsOrdinary carbon steel, stainless steelStainless steel, titanium, high-purity aluminumS···

• 12

  2021-05

  J-type thermocouple materials and characteristics

  J-type thermocouple, namely iron-copper-nickel thermocouple, also known as iron-constantan thermocouple, is also a kind of low-cost metal thermocouple. Its positive electrode (JP) ···

• 28

  2021-04

  Pretreatment of glass-to-metal sealing parts

  After the metal parts and the connected glass parts are made according to the requirements on the drawings, they must first be cleaned and dried. The surface of the joint must be g···

• 25

  2021-04

  Characteristics and applications of plastics

  Plastic is malleable. As the name suggests, plastic is a material that can be molded. The so-called plasticity of plastic means that the solid plastic can be softened by heating, a···

• 24

  2021-04

  The composition of plastic

  The plastic we usually use is not a pure substance, it is made up of many materials. Among them, high molecular polymers (or synthetic resins) are the main components of plastics. ···

• 23

  2021-04

  Graphite properties and applications

  The performance of graphite is closely related to the impurities contained. Natural graphite has a large impurity content, so artificial graphite is generally used. Recently, pyrol···