Surface Finishing Tutorial
#328 Types and Characteristics of Electric Spraying
Category : Thermal Spraying
January26, 2018
[Table] shows the types and characteristics of electric spraying method using electric power as the heat source.
[Table] Types and characteristics of electric spraying method
Type | Arc spraying | Plasma spraying | Wire explosion spraying | Spraying and fusing |
Gas | Water |
Heat source | Arc |
Plasma
such as
nitrogen-
hydrogen,
argon-
hydrogen,
argon-helium,
and argon-
oxygen air |
Oxygen
plasma jet
generated by
water
decomposition | Discharge
energy | Oxyacetylene
flame,
oxygen-
hydrogen |
Spraying
materials | Steel
materials,
such as
carbon steel
and stainless
steel, non-
ferrous
metals
including
molybdenum,
nickel,
aluminum,
and copper,
as well as
their alloy
metals | Most of
the
metals,
high
melting
point
oxides
including
AL2O3,
Cr2O3,
and ZrO2,
carbide
cermet
including
CrC-NiCr
and WC-
Co, some
organic
materials | Mostly the
oxides, such
as AL2O3,
ZrSiO4, and
ZrO2 | Carbon
steel,
stainless
steel,
copper,
and the
most
metals
including
Mo, Ni, Ta,
and W | Self-fluxing
alloy,
Ni-B-Si,
Ni-Cr-B-Si,
Co-NiCr-B-Si,
Cr-Ni-W-B-Si |
Shape of
spraying
materials | Wire |
Powder, wire | Powder | Wire | Powder,
string-
shaped |
Sprayed
materials | Most of the metals;
some glass, ceramics
and two to three
organic
materials | Most of the
metals;
ceramics with
some
limitations | Most of
the metals | Mostly
ferrous
materials |
Base
material
temperature
(%) | Can be controlled under 200°C | Around 1050°C |
Porosity
(%) | 5-15 | 3-15 | 10-20 | 1 or less | 0 |
Characteristics | Relatively thick film can be formed by thermal spraying. | Thermal spraying of high melting point materials can be done easily. | Thick films can be formed by spraying oxides. Shapes and dimensions of the machined components are limited. | Thermal spraying can be applied on the inner surfaces. | Thermal deformation occurs. |
|
* |
Note)Description for the types of thermal spraying methods
| 1. | The arc spraying is a method that dissolving spraying materials using heat from arc discharge. |
| 2. | The plasma spraying is a method that generating high-temperature plasma gas of nitrogen or the mixture of nitrogen and hydrogen using arc discharge, supplying spraying materials in it, and then spraying it to workpiece. |
| 3. | The explosion spraying is a method that causing an explosion using the mixture of oxygen and acetylene or the discharge energy, concentrating the energy into one direction, and then spraying it with powder materials using that energy. |
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