Mechanical Resistance – Ceracoats

Mechanical Resistance

Mechanical Resistance

Mechanical Properties

Glass has the disadvantages of brittleness and low tensile strength. One remedy is to place the glass lining under compression. This is achieved during cooling of the glassed item after firing. This is caused by the difference between the coefficients of thermal expansion of the glass and the base metal and the excellent bond between them.
If the glass steel composite is subjected to a mechanical strain due to handling, mechanical or thermal shock, the compressive stress must not be overcome before putting the glass into tension, causing it to fail. Therefore, the residual compressive stress in the glass acts as an effective shock absorber.

Abrasion

Abrasion of the glass lining is simply a wearing away of the glass abrasive solids in the reactor. It is characterized by a loss of fire polish and in severe cases, a rough sandpaper-like finish.
Experience has shown that failure due to abrasion alone is very uncommon. In combination with acid corrosion, however, failure can be quite severe: abrasion weakens the silica net-work mechanically allowing acid corrosion to accelerate.
CERA 9020 (Cobalt Blue) has good resistance to abrasion as well as better physical characteristics such as mechanical shock, impact resistance, thermal shock resistance etc.

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