China Sealcon Company

Basic Properties Of Ceramic Materials

It is not possible to use common ceramic materials for ceramic seal ring. Engineering ceramics (i.e. structural ceramics) should be used, the main types of which are Al2O3, ZrO2, SiC and so on. These engineering ceramics are mostly ionic bonds and covalent bonds, which have high melting point, good corrosion resistance and antioxidation, high hardness and high temperature strength compared with metal and polymer. In traditional sealing elements, the rigid seal of metal materials and the "Elastoplastic" seal of non metal materials have the corrosion resistance and poor temperature resistance, which makes the life of the sealing element low. As a sealing element, engineering ceramics have been used more and more widely because of its high temperature resistance, high hardness and good chemical stability. As far as the current situation is concerned, engineering ceramic materials such as hydride porcelain, carbide porcelain and so on as mechanism seal friction pair and inlaid porcelain ring have been widely used, but they are only used as monomers in some products. As a mutual sealing element, it is relatively rare. With the development and research of engineering ceramics, its toughening and strengthening technology has been improved. Its good comprehensive mechanical properties provide a broad prospect for the application of engineering ceramic materials, and table 1 is the performance at normal temperature of commonly used engineering ceramics.

Table 1 Mechanical Properties of several common engineering ceramics

Material

Density

(g/ cm3)

Hardness

HRA

BendingStrength

(MPa)

pressure resistance

(MPa)

FractureToughness

(MPa·m1/ 2)

MaximumUse Temperature

( ℃)

Al2O3 (98 %)

3172

88

350

2068

8106

1750

ZrO2

5165

84

735

2100

7113

2100

SiC

311

93

550

3138

416

1650


From table 1, it can be seen that several ceramic materials have good mechanical properties, not only bear certain pressure, but also bear a certain impact force for the sealing element, and can choose material with better toughness, such as AlO porcelain, and it is cheap, easy to take material, convenient to manufacture, suitable for new type of sealing element.
Related News
  • Characteristics Of PTFE Seal

    Characteristics Of PTFE Seal

    May 3, 2018First, material advantages: polytetrafluoroethylene (PTFE), also known as Teflon / Teflon or plastic King (F4), is a copolymer of tetrafluoroethylene monomer, which has the following advantages;1. che...view
  • Advantages Of PTFE

    Advantages Of PTFE

    May 4, 2018(PTFE) oil seal is one seal of ptfe mechanical seal. It has the following advantages compared to the rubber oil seal.1.Rubber oil seal with a spring pressed tip mouth, the width of the contact with th...view
  • The Installation Of PTFE Mechanical Seals

    The Installation Of PTFE Mechanical Seals

    May 4, 2018The installation of ptfe mechanical seals need to pay attention to these points.1. The radial runout of the rotating shaft of the equipment should be less than 0.04 mm, and the axial momentum is not a...view
  • Main Performance Of Bellows

    Main Performance Of Bellows

    May 4, 2018The main performance parameters of the bellows are stiffness, allowable displacement, pressure resistance, cycle life, effective area, working temperature and so on. The main geometric parameters incl...view
  • The Difference Between Mixing Machine Mechanical Seal And Pump Mechanical Seal

    The Difference Between Mixing Machine Mechanical Seal And Pump Mechanical Seal

    November 29, 2017The difference between Mixing machine mechanical seal and pump mechanical sealThe mechanical seal is a mechanical part used to seal the rotary shaft and stop the pump chamber.The sealed part is a cyli...view
  • Analysis And Maintenance Scheme Of Leakage Point Of Mechanical Seal For Pum

    Analysis And Maintenance Scheme Of Leakage Point Of Mechanical Seal For Pum

    November 29, 2017Pump with a wide range of mechanical seals, different models, but there are five major leaks: Seal between sleeve and shaft; seal between movable ring and shaft sleeve; dynamic and static ring seal; t...view