In vacuum system applications, adsorbents and getters are often encountered.Although both have the function of trapping gas, they are different products.what's the difference?
The purpose of the adsorbent is to enable substances such as activated carbon, activated alumina and molecular sieves to use their dense pore structure to capture the adsorbed gas and other substances.According to different principles, the form of adsorption also distinguishes physical adsorption and chemical adsorption.Generally speaking, the adsorbent has good gettering performance at low temperature, and will begin to desorb and outgas under high temperature conditions.Therefore, many adsorbents can be regenerated and reused simply by baking.Adsorbents are usually used for physical adsorption of cold adsorption pumps and traps.
The use of getters is opposite to that of adsorbents and has good gettering performance at high temperatures.Getters are divided into two types: evaporative and non-evaporative getters.The former realizes the inhalation process through high temperature evapotranspiration, surface adsorption and internal diffusion, while the latter directly realizes the inhalation process through two steps of surface adsorption and internal diffusion.In terms of technology, the latter has developed various getter pumps, such as zirconium-aluminum getter pumps.Different getters have different gettering characteristics for different gases.The former is composed of IIA elements such as calcium, magnesium, strontium, and barium and their alloys, and the latter is composed of zirconium, titanium, or, tantalum and IVB transition elements and their alloys.
Getters are used in a large number of applications and vacuum electronic devices to maintain the vacuum of the device during storage or operation, remove the released gas, or increase the vacuum of the vacuum device in a short time.
Therefore, although the functions of the adsorbent and the getter are similar, there are many differences in usage and material properties, so they should not be confused.
Vacuum systems are widely used in industry, such as vacuum coating, vacuum heat treatment, vacuum drying, vacuum packaging, vacuum suction cups, vacuum insulation panels, vacuum glass, vacuum compression bags, vacuum circuit breakers, vacuum tubes, etc.Therefore, Yazhi Lide Electromechanical Technology Co., Ltd. believes that it is necessary to fully understand the vacuum system knowledge.
