amdry 301 10-649

AMDRY 301 Cast CrushedTungsten Carbide-CobaltThermal Spray Powder

Technical Bulletin #10-649

Issued October 2000Supersedes June, 1985

TM

#10-649 1AMDRY 301 Cast Crushed Tungsten Carbide-Cobalt Thermal Spray Powder

AMDRY 301 is a complex compound composed of cobalt, tungsten and carbon. When plasma arcsprayed the product is an intricate formulation of cobalt and tungsten carbides chemically similar toAMDRY 302. AMDRY 301 has a much finer particle size range than AMDRY 302 thus permitting theapplication of finer, denser, and harder deposits. The material is not as technique sensitive asAMDRY 302, thus a more consistent sprayed product is assured.

Coatings of AMDRY 301 are recommended for use in applications, less than 482 C (900 F) , where hard,wear resistant surfaces are required.

AMDRY 301 meets the material requirements of the following specifications:Aerospace Material Specification AMS 7879Boeing Co. BMS 10-67 Type 1Pratt and Whitney Aircraft PWA 1301AiResearch EMS 52432 Class IXUSAF MIL-P-83348, Type II, Class I, Comp AGeneral Electric Company Aircraft Engine Group, B50TF175, Class AMotoren and Turbinen Union MTU 317

Chemical Composition

Carbon (C) 3.9%Cobalt (Co) 12.0%Tungsten (W) Balance

Sieve Analysis-325 Mesh +5 Microns (-45 m + 5 m)

Melting Temperature

Tungsten Carbide 5031-5175 F(WC/W2C) (2777-2857 C)Cobalt (Co) 1495 C (2723 F)

Plasma arc sprayed coatings of AMDRY 301 are extremely hard. Rockwell 15N 86 minimum, anddense with a nominal value of 0.497 lb/cu in (13.175 g/cc). Adherence, measured over a lightly gritblasted surface (90 RMS) is greater than 6.0 KSI (41 MPa).

Typical Properties of Powder

Customer Specifications

AMDRY 301 Cast Crushed Tungsten Carbide-Cobalt Thermal Spray Powder

Typical Properties of Sprayed Material

#10-649 2AMD RY 301 Cast Crushed Tungsten Carbide-Cobalt Thermal Spray Powder

Anticipated microstructure is illustrated in the attached photomicrograph. Blocky carbides are depicteduniformly distributed throughout a cobalt rich matrix. High density with relatively minute quantities ofpores or voids is evident.

AMDRY 301 is extremely smooth as sprayed (less than 150 rms) and is often used in this condition.Where finer finishes are required, AMDRY 301 may be ground to achieve the desired requirements.Wherever possible use a 400 grit diamond wheel with very light infeeds, less than .025 mm (.001inches) per pass and finish with cuts of less than 0.0127 mm (.0005 inches) per pass; use a floodcoolant. When diamond wheels are not available rough grinding may be accomplished with a 60 gritsilicon carbide wheel, finish with a 150 grit silicon carbide wheel. Do not use aluminum oxide wheelswhen grinding AMDRY 301 or other AMDRY thermal spray products unless explicitly recommended.

Always spray AMDRY 301 in a well ventilated area. Avoid prolonged inhalation or contact with the skin.When AMDRY 301 is to be sprayed for extended periods it is recommended that the spray area beequipped with a water wash exhaust booth and the operator provided with protective clothing. Owingto their fineness and high surface area, thermal spray powders have a tendency to pick-up moisturewhich may reduce their flow characteristics. Flowability may be maintained by storage in a warmcabinet or drying the powder at 93 to 121 C (200-250 F) for 2 hours prior to use. Drying should beaccomplished with the container seal removed and the lid slightly loosened. Storage containers shouldbe tumbled prior to transferring the spray material to the powder feed unit. This will guard against pos-sible powder separation caused by settling during transit or storage.

AMDRY 301 or other AMDRY tungsten carbide coatings can be used at temperatures up to 482 C (900 F).

AMDRY 301 may be plasma arc sprayed using argon as the primary plasma forming gas. Applicationusing combustion gas-flame spray techniques is not recommended. Either helium or hydrogen maybe used as a secondary gas. However, where helium is utilized maximum coating thickness should berestricted to 0.51 mm (0.020 inches) ; with other gas combinations thickness limitation is 0.035 inches(0.89 mm).The below listed parameters are the most widely used for the equipment noted. Where applicationrequires, parameters should be varied slightly to obtain the optimum AMDRY 301 deposit. Parameterscan be furnished for other pieces of equipment on request.

Plasma-Technik Spray SystemA/H2 A/He

Gun: F4 F4Nozzle: #6 Internal Feed Standard

Application

Finishing

Recommendations


Powder Port:Type #1 (1.5 mm/0.059 in) #2 (1.8 mm/0.071 in)Gage Not Required #6Angle 75 90

Disc rpm(1) 20 14Hopper NL with motor NL with motor

Gases: Pressure Flow Pressure Flow

Primary (A) 3.0 8.0 2.8 9.5Secondary(2) 3.0 1.5 3.0 6.0Carrier (A) 2.5 3.0 3.0 6.5

Amps: 820 600

Voltage: 60 78

Spray Distance: 4.5-5.5 in 4.5-5.5 in(114-140 mm) (114-140 mm)

Spray Rate: 5.0-5.5 lb/hr 5.5-6.5 lb/hr(38-42 g/min) (42-49 g/min)

(1) As a starting point, adjust to indicated spray rate.(2) Adjust flow as required to obtain indicated voltage.

Metco 3M/7M Plasma Spray System

A/H(2) A/He(2)Nozzle: GE GP

Powder Port: #2 #3

Meter Wheel: S S

Wheel rpm(1): 15 10

Gases: psi (kPa) Flow psi (kPa) FlowPrimary 100 (690) 100 75 (517) 35Secondary(3) 50 (345) 10 55 (379) 50Carrier 100 (690) 37 75 (517) 37

Amps: 390-400 490-500

Volts: 55-60 45-50

Spray Distance: 3.0-4.0 inches 3.0-4.0 inches(76-102 mm) (76-102 mm)


Spray Rate: 7.0-8.0 lbs/hr 3.5-4.0 lbs/hr(53-60 g/min) (26-30 g/min)

(1) As a starting point, adjust to indicated spray rate.(2) Use Argon distribution ring.(3) Adjust flow as required to obtain indicated voltage. Do not reduce hydrogen flow to zero or elevate

above 25.

Plasmadyne Spray Systems

Gun: SG-1B(1) SG-100Anode 901-12 2083-105Cathode 901-14 1083A-104Gas Injector 1083A-2083-110

Gases: psi (kPa) Flow psi (kPa) OrificePrimary (A) 100 (690) 60 150 (1035) 56Auxiliary(2) 100 (690) 30 200 (1380) 80Carrier (A) 100 (690) 12 100 (690) 77

Open Circuit Voltage: 160

Operating Voltage: 35 67

Amps: 380 900

Spray Distance: 2.0-3.0 in 5.0 in(51 to 76 mm) (127 mm)

Spray Rate Setting: A/30 1.4

(1)Use 901 high velocity attachment with argon cover gas wand. Set argon pressure at 50 psi (345 kPa) with a flow of 30 cfh (14 l/min)

(2)SG-1B: Hydrogen; SG-100: Helium, Mode 80 kW Mach II

Always spray AMDRY 301 in a well ventilated area. Avoid prolonged inhalation or contact with the skin.When Amdry 301 is to be sprayed for extended periods it is recommended that the spray area beequipped with a water wash exhaust booth and the operator provided with protective clothing.

Owing to their fineness and high surface area, thermal spray powders have a tendency to pick-upmoisture which may reduce their flow characteristics. Flowability may be maintained by storage in awarm cabinet or drying the powder at 93-121 C (200-250 F) for 2 hours prior to use. Drying shouldbe accomplished with the container seal removed and the lid slightly loosened. Storage containersshould be tumbled prior to transferring the spray material to the powder feed unit. This will guardagainst possible powder separation caused by settling during transit or storage.

Recommendations


The information provided in this document is for the convenience of Sulzer Metcos customers for thepurpose of evaluation and proper use of the Sulzer Metco product(s) described herein. This documentand the information contained herein is the property of Sulzer Metco and shall not be used, disclosed,or reproduced in whole or in part for any purpose other than for the use of said product(s). Nor shallthis information be used in any way with goods not manufactured and sold by Sulzer Metco. SulzerMetco makes no warranties, express or implied, as to the information contained herein.

amdry 301 10-649

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