US2007295833A1PendingUtilityA1
Thermal Spraying Nozzle Device and Thermal Spraying System
Est. expiryJan 7, 2025(expired)· nominal 20-yr term from priority
B05B 7/1463C23C 4/123B05B 7/168
40
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0
Cited by
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0
Claims
Abstract
[Subject]A thermal spraying nozzle device and a thermal spraying system are to be provided which can supply a thermal spraying material constantly and can control the state of a film or deposit. [Solution] In a thermal spraying nozzle device wherein carrier gas is introduced into an inlet side of a nozzle to form a supersonic gas flow and a thermal spraying material is atomized and ejected by the gas flow, a storage section ( 4 ) for the storage of molten metal as the thermal spraying material is connected an end portion on the inlet side of the nozzle ( 2 ) through a connecting pipe, the nozzle has a throat portion ( 2 a ) for accelerating the introduced carrier gas to supersonic velocity and a divergent region ( 2 b ) formed downstream of the throat portion toward an outlet, the metal particles atomized by the supersonic gas being cooled to a solidified or semi-solidified state in the divergent region.
Claims
exact text as granted — not AI-modified1 . A thermal spraying nozzle device wherein carrier gas is introduced from an inlet side of a nozzle to form a supersonic gas flow and a thermal spraying material is atomized and ejected by said gas flow, said thermal spraying nozzle device comprising,
a storage section storing molten metal as said thermal spraying material connected to an end on the inlet side of said nozzle through a connecting pipe, and, said nozzle having a throat portion and a divergent region in a downstream of said throat portion toward an outlet side to form the supersonic gas flow, wherein said thermal spraying nozzle device is configured such that metal particles atomized by the supersonic gas flow are cooled to a solidified or semi-solidified state in said divergent region and then ejecting in a predetermined direction from the outlet side of said nozzle.
2 . The thermal spraying nozzle device according to claim 1 , wherein, within said connecting pipe, a molten metal outlet pipe is extended from said storage section toward the center in said throat portion or the center on the downstream side of the throat portion and an outside portion of said molten metal outlet pipe constitutes a channel for the carrier gas to flow therethrough in an accelerated state.
3 . The thermal spraying nozzle device according to claim 1 , wherein a divergent angle of said divergent region formed on the downstream side of said throat portion is not larger than 15° in terms of a half-cone angle.
4 . The thermal spraying nozzle device according to claim 3 , wherein the length of said divergent region is a flight distance until solidification or semi-solidification of the atomized metal particles and is determined on the basis of a flight distance which is determined modeling both flight distance of the atomized metal particles and the temperature of the metal particles.
5 . A thermal spraying nozzle device according to claim 4 , wherein the flight distance until solidification or semi-solidification of said atomized metal particles is determined by first determining a flight time until change of the atomized metal particles into a solidified or semi-solidified state and then substituting said flight time into the following expression, and the length of said divergent region is set to a length of not shorter than said flight distance:
l
f
=
u
g
t
f
-
u
g
2
ρ
g
t
f
+
ρ
s
d
s
a
g
u
g
2
ρ
g
u
g
2
ρ
s
d
s
a
g
u
g
2
ρ
g
t
f
+
ρ
s
d
s
a
g
+
ρ
s
d
s
a
g
u
g
ρ
g
(
18
)
where l f is the flight distance of the particles, t f is the flight time until solidification or semi-solidification of the particles, u g is flow velocity of gas, p g is gas density, p s is particle density, d s is particle diameter, and a g is sound velocity of gas.
6 . The thermal spraying nozzle device according to claim 1 , wherein, given that an inlet pressure of the carrier gas is p 0 and a nozzle outlet pressure thereof is P B , the carrier gas is introduced into said nozzle in a state in which the inlet pressure p 0 satisfies the following expression:
p
0
≥
p
B
(
1
+
κ
-
1
2
M
2
)
κ
κ
-
1
(
1
)
where κ: specific heat ratio of compressed gas, M: Mach number in the expanded nozzle portion on the downstream side of the throat portion.
7 . A thermal spraying system comprising:
a thermal spraying nozzle device wherein carrier gas is introduced from an inlet side of a nozzle to form a supersonic gas flow and a thermal spraying material is atomized and ejected by said gas flow, said thermal spraying nozzle device comprising,
a storage section storing molten metal as said thermal spraying material connected to an end on the inlet side of said nozzle through a connecting pipe, and,
said nozzle having a throat portion and a divergent region in a downstream of said throat portion toward an outlet side to form the supersonic gas flow,
wherein said thermal spraying nozzle device is configured such that metal particles atomized by the supersonic gas flow are cooled to a solidified or semi-solidified state in said divergent region and then ejecting in a predetermined direction from the outlet side of said nozzle,
a carrier gas supply unit connected to said nozzle through a conduit to introduce the carrier gas under pressure into the nozzle;
a sealed chamber accommodating said nozzle and a base material for collision therewith of the ejected particles; and
pressure reducing means for reducing the internal pressure of said sealed chamber.
8 . A thermal spraying system comprising:
a thermal spraying nozzle device wherein carrier gas is introduced from an inlet side of a nozzle to form a supersonic gas flow and a thermal spraying material is atomized and ejected by said gas flow, said thermal spraying nozzle device comprising,
a storage section storing molten metal as said thermal spraying material connected to an end on the inlet side of said nozzle through a connecting pipe, and,
said nozzle having a throat portion and a divergent region in a downstream of said throat portion toward an outlet side to form the supersonic gas flow,
wherein said thermal spraying nozzle device is configured such that metal particles atomized by the supersonic gas flow are cooled to a solidified or semi-solidified state in said divergent region and then ejecting in a predetermined direction from the outlet side of said nozzle:
a molten metal supply unit connected to said storage section through a connecting pipe to supply molten metal under pressure continuously to the molten metal in the storage section; and
a base material supply unit for continuous supply of said base material.Join the waitlist — get patent alerts
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