Thickness of Coatings
The performance and protective capacity of coatings are determined by their
thickness and linear erosive wear rate. The latter depends on particle concentration
and intensity of erosion (wear per mass unit of erodent material). From the analysis
of the linear wear of different materials (ceramics, hardmetals) and coatings it
follows that the linear erosion rate per kilogram of the erodent is in the range of
0.01–0.1 mm by hardmetals and up to 0.5–0.6 mm by ceramics at high impact
angles (Table 4.20).
In practice, the linear erosion rate (wear in mm per erodent unit amount,
mm/kg) depends on the influence of particle concentration that may be different. It
differs in the machines operating in different conditions of abrasive erosion: the
positive effect of high particle concentration of the material in milling equipment,
for example, in disintegrators, is observed; erosion at low particle concentration
takes place in ventilators, exhausters, etc. If in the first case, wear is in the tenth
part of mm per hour, in the conditions of low particle concentration, it is in the
hundredth or thousandth parts of mm per hour. As dependent on erosion
conditions, thickness of coatings varies in the range of 0.2–1 mm.
Methods of thermal spray are most widely used in the production of erosive
wear resistant coatings. These methods enable wear resistant surfaces to be
Thickness of Coatings
The performance and protective capacity of coatings are determined by their
thickness and linear erosive wear rate. The latter depends on particle concentration
and intensity of erosion (wear per mass unit of erodent material). From the analysis
of the linear wear of different materials (ceramics, hardmetals) and coatings it
follows that the linear erosion rate per kilogram of the erodent is in the range of
0.01–0.1 mm by hardmetals and up to 0.5–0.6 mm by ceramics at high impact
angles (Table 4.20).
In practice, the linear erosion rate (wear in mm per erodent unit amount,
mm/kg) depends on the influence of particle concentration that may be different. It
differs in the machines operating in different conditions of abrasive erosion: the
positive effect of high particle concentration of the material in milling equipment,
for example, in disintegrators, is observed; erosion at low particle concentration
takes place in ventilators, exhausters, etc. If in the first case, wear is in the tenth
part of mm per hour, in the conditions of low particle concentration, it is in the
hundredth or thousandth parts of mm per hour. As dependent on erosion
conditions, thickness of coatings varies in the range of 0.2–1 mm.
Methods of thermal spray are most widely used in the production of erosive
wear resistant coatings. These methods enable wear resistant surfaces to be
การแปล กรุณารอสักครู่..
