1.9.1.2-10T - Aluminum Bronze

7/29/2019 1.9.1.2-10T - Aluminum Bronze

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File: 1.9.1.2-10TIssue: O10504

Supercedes: L10906

Mat erial Review :

Made exclusively for arc spraying. Characteristics

of the coating are very high bond strengths and itsability to produce a dense, wear resistant surface,advantageous for machine element work. The use

of 1/16 wire with this material has the added

advantage of fume reduction during spraying. Theprealloyed wire produces superior bond coats that

are dense, resistant to corrosion, mechanical andthermal shock. The material is very suitable as aone-coat system and machines very easily to a

finish of 5 micro inches. The unusual self-bondingability of the alloy is attributed to the exceptionallyhigh temperatures the alloy reaches, and which on

impact with the base material, diffuses to form ametallurgical bond. One of the major problems inachieving high quality, well-bonded coatings in any

thermal spray process is the expensive andextensive preparation of the substrate. Aluminum

bronze eliminates the problem. The coating,through extensive testing, has been found to be farsuperior to that produced by most materials, notonly in bond strength, but also in sharp edge and

impact loading. Aluminum bronze is self-bondingto a broad range of smooth metal surfacesincluding annealed or hardened carbon steels,

hardened alloy steels, stainless steels, cast iron,and copper based alloys. It is highlyrecommended as the bond coat of choice for

copper based alloys, as the nickel aluminum bondcoats do not bond well to copper substrates. Thefact that the high performance characteristics are

obtained only with the wire arc spray process is

attributed to the higher temperatures achieved--arctemperatures in the range of 7000-12,000F--

which produce superheated particles.

Arc Spray 10T aluminum bronze wire can be

sprayed with any Praxair and TAFA Arc Spray gun.

CAUTION: All Praxair and TAFA wires have beenoptimized for arc spraying. Use of alternate wires

usually cause problems such as excessive tipwear, spitting and feed problems. We onlyrecommend Praxair and TAFA certified wires.

Applicat ion Review :

Recommended for all general metallizing work withbronze. This material is an extremely effectivebond coat where surface preparation may be less

than optimum; for example, on cast iron or steel. Itis also used as a coating in its own right and hasthe highest corrosion resistance and maximum

wear resistance of the arc spray bronzes. Majoruses, in addition to bond coats, are for bearings inthe steel industry and for reclaiming alumi-

num/bronze components, including propeller shaftsfor operation in sea water. Praxair and TAFA 10T

aluminum bronze can be machined but, again,grinding will give a better surface.

Arc spray coats from 0.004" (0.01 mm) to 0.006"

(0.015 mm) can be readily applied in one pass.Thicker coatings up to 1/4 inch (6.3 mm) havebeen applied by continuous spraying. Thus, in

some cases, 10T can be used as a one-coatsystem. Coatings can be machined to a mediumfinish with high speed tools or ground to smooth

finish with aluminum oxide or silicon carbidewheels. It can be sprayed directly on a chemicallyclean surface without conventional blasting, turning

or roughening, thereby eliminating the need for

expensive preparation equipment and theassociated labor and quality control.

Praxair and TAFA Arc Spray Aluminum Bronze - 10T


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Composition

Copper Balance

Aluminum 7.0 percent

Iron 0.5 percent

Coating Physical Properties

Wire Size 1/16" (1.6 mm)

Deposit Efficiency 80 Percent*

Melting Point 1800F (982C)

Bond Strength 6066 psi (41.8 MPa) clean surface6740 psi (46.5 Mpa) blasted surface

Coating Texture (as sprayed) Variable*

Texture (as machined) 30-100 Microinches aa **

Hardness 55-60 Rb144 (Knoop100)

Coating Density 6.3 gm/cc**

Coating Weight 0.033 lbs/ft2/mil.

Shrink 0.0055 in/in (cm/cm)

Impact, Sharp Edge & Bend Resistance Excellent

SprayingSpray Rate 9 lbs/hr/100 amps (4.1 kg/hr/100 amps)

Coverage (wire consumption) 0.9 oz/ft2/0.001" (1.10 kg/m

2/100 microns)

Spray Pattern*** (approximate 8" standoff) Cross Nozzle/Positioner - 1" (2.5 cm)vertical height x 1 3/4" (4.4 cm) width

Slot Nozzle/Positioner - 2" (5 cm)

vertical height x 1" (2.5 cm) width

Length of wire per lb. 100 ft. (1/16"), 62.5 ft (2 mm)

______________________________

* 6" standoff, 40 psi - 8830, depends on air pressure - fine with high psi, average with medium psi, andrough with low psi.

** Depends on atomizing air pressure.*** Higher air pressures, smaller wire (1/16), and lower amperage with red nozzle cap gives smallest

diameter pattern.


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Coating TypeNormal8830/8835

Arc Jet8830/8835

Arc Jet 9000 9000

Atomizing Air Pressure:PrimarySecondary

45-60c

---5040

6060

65-75c

---

Nozzle Cap Green * Green Green

Nozzle/Positioner (Cross=C; Slot=S) Long C ** Long C Long C

Arc Load Voltsa

28-30 29-31 29-31 29-31

Ampsb

50-300 50-300 50-300 50-300

Standoff Inches 4-6 3-4 3-4 4-6

Coating Thickness/Pass-mils 3-5 5 5 3-5

Coating Texture-microinches aa 200-350 150-250 150-250 200-350

Spraying Procedures:

Using excessive voltage reduces quality of coating.Voltage should be adjusted to give minimum noiseand smooth arc operation. Excessive voltage

causes larger particles and poor spray pattern.Too low a voltage will cause popping.

Be sure not to overheat substrate even if thismeans stopping to allow cooling, use air jet cooling

if greater speed is required. Note that on someapplications where preheating is tolerable,preheating work to 300F can improve bond and

deposit efficiency.

NOTE: Standard air caps and positioners can be

used in 8830 or 9000 systems.

* P/N 450729 8830 Arc Jet Air Cap

** P/N 620074 Arc Jet Modified Short Cross(8830 & 9000)

_______________________

a When using power lead extensions other than thenormal 12 foot furnished, the voltage must beincreased by approximately 3.4 volts per

50 foot of extension; i.e., add 3.4 volts to the

recommended voltage setting for a given wire if theextension is increased to a 50 foot length.

b Can vary between 50-300 depending on size ofworkpiece and traverse speed.

c For finer finish, raise air pressure at point of finish.

Finishing:

Praxair and TAFA 10T coatings can be machined

or ground to achieve a desired finish. Excellentfinishes have been obtained on coatings of Praxairand TAFA 10T using tungsten carbide tool bits with

surface feet per minute, and a traverse of 0.0025"per revolution. Best results are obtained with cutsof 0.010".

Hazards:

Observe normal spraying practices, respiratoryprotection and proper air flow patterns advised.

For general spray practices, see AWS PublicationsAWS C2.1-73, "Recommended Safe Practices forThermal Spraying" and AWS TSS-85, "Thermal

Spraying, Practice, Theory and Application."Thermal spraying is a completely safe processwhen performed in accordance with proper safetymeasures. Become familiar with local safety

regulations before starting spray operations.DO NOT operate your spraying equipment or usethe spray material supplied before you have

thoroughly read the Praxair and TAFA InstructionManual.

A Material Safety Data Sheet will be sent with eachinitial purchase and updated as required.

DISREGARDING THESE INSTRUCTIONS MAYBE DANGEROUS TO YOUR HEALTH.

The Information provided herein is believed tobe accurate and reliable; however, results mayvary with workpiece preparation and operator

technique. Praxair and TAFA warrants onlythat the wires are free of defects in materialand workmanship. No other warranty is

expressed or implied.


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Copyright 2000 Praxair Technology, Inc. All rights reserved

www.praxairthermalspray.com

[email protected]: 1-317-240-2650

Fax: 1-317-240-2596

Praxair, the Flowing Airstre amdesign and Making our planet more

produc tive are trademarks or registered trademarks of Praxair

Technology, Inc. in the United States and/or other countries.

Other trademarks used herein are trademarks or registered

trademarks of their respective owners.

Printed in the United States of America 05-2000

www.tafa.com

[email protected]

Telephone: 603-224-9585

Fax: 603-225-4342

TAFA is constantly improving its products, therefore specifications are

subject to change without notice

TAFA Incorporated is a Praxair Surface Technologies company.

1.9.1.2-10T - Aluminum Bronze

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