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DSM-0310.0 WC10Co4Cr SintCrush

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51 views3 pages

DSM-0310.0 WC10Co4Cr SintCrush

Uploaded by

Nabil Salim
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Material Product Data Sheet

Tungsten Carbide – 10 % Cobalt – 4 % Chromium Sintered


and Crushed Powders for Thermal Spray
Powder Products: Quick Facts
Amdry™ 5843, WOKA™ 3903
Classification Carbide, tungsten-based
Chemistry WC 10Co 4Cr
1 Introduction
Tungsten carbide cobalt chromium sintered and crushed Manufacture Sintered and crushed
powders for thermal spray are typically applied using the Morphology Angular / blocky
HVOF process to produce dense, abrasion and erosion Purpose Corrosion and wear resistance
­resistant coatings. Melting Point Approx. 1480 °C (2700 °F)
Service Temperature ≤ 500 °C (930 °F)
The sintered and crushed morphology generally produces Process HVOF
coatings with a higher as-sprayed coating density compared
to agglomerated and sintered powders. This allows the
­usage of these coatings on high pressure gate valves and
other high pressure components.

Tungsten carbide acts as the wear-resistant hard phase


component. The cobalt chromium matrix improves corrosion
and erosion resistance, compared with carbides having a
­cobalt-only matrix.

This class of thermal spray powders is particularly suitable


for applications where both wear and corrosion resistance is
needed. They also offer better corrosion and cavitation
­resistance than tungsten-carbide-cobalt coatings. These
materials also produce excellent thermal sprayed coating
­alternatives to hard chromium plating.
SEM photomicrograph of Amdry 5843 showing the powder exterior morphology
typical of these products.
1.1 Typical Uses and Applications
Typical applications include:
n Gate valves
n Resistance to abrasion and cavitation
n Paper and printing cylinders
n Pump impellers, shafts and liners
n Hydroelectric turbine components
n Extruder screws and forging dies
n Steel industry guide rolls and pins

DSM-0310.0 – WC 10Co 4Cr Sintered and Crushed Powders


© 2021 Oerlikon Metco 1
2 Material Information

2.1 Chemical Composition

Product Weight Percent (nominal)


W Co Ctotal Cr Fe Others
Amdry 5843 Bal. 9.0 – 11.0 5.0 – 5.5 3.5 – 4.5 N.R. 1.0 max
WOKA 3903 Bal. 9.0 – 11.0 4.9 – 6.0 3.1 – 4.9 1.0 max 1.0 max

N.R. = Not Reported

2.2 Particle Size Distribution

Product Nominal Size Distribution (µm)


Amdry 5843 –45 +16
WOKA 3903 –45 +11

Particle size distribution: Analysis by sieve per ASTM B214 for all upper limits; values of 38 µm and lower based on laser scattering per ASTM B 822 (Microtrac).

2.3 Key Selection Criteria n For aerospace applications such as landing gears,
n Amdry 5843 is a premium grade material which produces ­consider Metco 516X series products.
coatings that combine excellent abrasion and erosion n For applications where more stress tolerance and less
­resistance with corrosion resistance and moderate cavita- corrosion resistance or wear resistance is required,
tion resistance. choose a tungsten carbide – 17 % cobalt material or a
n For applications where cavitation is not involved, chromium carbide – nickel chromium material.
WOKA 3903 is a more economical choice. WOKA 3903 n For applications where service temperatures are greater
­produces coatings with excellent abrasion and erosion than 500 °C (930 °F), but less than 700 °C (1290 °F),
resistance. It can be sprayed slightly thicker than choose a material that contains both chromium carbide
­Amdry 5843 and produces dense, gas-tight coating and tungsten carbide, such as Woka 75xx or Woka 37xx
structures. Depending on the application, a sealer may be series products.
required after spraying. n For better corrosion resistance in alkaline (NaOH), sulfuric
n Select a material appropriate for the recommended spray acid (H2SO4) or saline (NaCl) solutions the following prod-
process and spray gun to be used. (refer to Section 2.5). ucts are recommended:
n Chromium carbide materials such as Woka 71xx,
2.4 Related Products Woka 72xx or Woka 73xx series products.
n For many applications, a more economical choice would n Materials that contain both chromium carbide and
be one of the agglomerated and sintered carbide tungsten carbide, such as Woka 75xx or Woka 37xx
­materials of the same chemistry, such as Woka 365X series products.
­series products. These products are proven materials for n When service temperatures exceed 700 °C (1290 °F),
use in applications that require heavy resistance to abra- choose a chromium carbide material with a nickel-­
sion and erosion, but they are less suitable for ultra high chromium matrix such as Woka 71xx, Woka 72xx or
pressure gate valves or a­ pplications where cavitation can- Woka 73xx series products.
not be excluded.

2.5 Recommended Spray Process and Spray Guns

Product HVOF
DiamondJet WokaJet / WokaStar / JP5000
Amdry 5843
WOKA 3903

DSM-0310.0 – WC 10Co 4Cr Sintered and Crushed Powders


© 2021 Oerlikon Metco 2
3 Coating Information

3.1 Key Thermal Spray Coating Information

Specification Typical Data


Recommended Spray Process HVOF
Corrosion Resistance Good in NaCl (1M), fair in HCl (1M), H2SO4 (0.5M) and NaOH (1M)
Porosity a < 0.5 %
Finishing Diamond grind
Maximum Service Temperature 500 °C 930 °F
a Data is for Amdry 5843 applied using liquid-fuel or gas-fuel HVOF. Value is dependent on spray gun chosen, spray gun hardware and spray parameters used.

3.2 Coating Parameters Recommended HVOF Spray Guns


Please contact your Oerlikon Metco Account Representative
DiamondJet series
for parameter availability. For specific coating application
WokaJet series
­requirements, the services of Oerlikon Metco’s Coating
­Solution Centers are available. WokaStar series

4 Commercial Information

4.1 Ordering Information and Availability

Product Order No. Package Size Availability Distribution


Amdry 5843 1001069 10 lb (approx. 4.5 kg) Stock Global
WOKA 3903 1066536 5 kg (approx. 11 lb) Stock Global

4.2 Handling Recommendations 4.3 Safety Recommendations


n Store in the original container in a dry location. See the SDS (Safety Data Sheet) in the version localized for
n Tumble contents prior to use to prevent segregation. the country where the material will be used. SDS are avail-
n Open containers should be stored in a drying oven to able from the Oerlikon web site at www.oerlikon.com/metco
prevent moisture pickup. (Resources – Safety Data Sheets).

Product SDS Index No.


Amdry 5843 50-2011
WOKA 3903 50-1264

Information is subject to change without prior notice.

DSM-0310.0 – WC 10Co 4Cr Sintered and Crushed Powders www.oerlikon.com/metco


© 2021 Oerlikon Metco info.metco@oerlikon.com3

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