TASK 70-49-56-340-803
1 . General.
A.Rene 80 alloy gives a coating that can have improved environmental resistance or temperature capability over other materials. This alloy is also used as a build-up coating for worn parts. This procedure gives instructions for the application of C07-052   Rene 80 alloy powder by plasma arc spraying.
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment.
(a)Refer to TASK 70-49-00-340-001, Thermal Spraying.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C07-052
Alloy Powder Rene 80 (Class B)
C.Referenced Procedures.
 
ATA No.
Description
 
70-49-00
Thermal Spraying
 
70-70-00
Testing and Quality Analysis
 
70-71-01
Bond Strength Tensile Testing of Thermal Spray Coatings
 
70-71-04
Metallographic Evaluation of Thermal Spray Coatings
D.Expendable Parts. None.
E.SPD Information. None.
F.Special Solutions. None.
G.Test Specimens. None.
3 . Dimensional Information. None.
TASK 70-49-56-340-802
1 . Spraying Parameters.
Subtask 70-49-56-340-004
A.Starting parameters sets will be listed in the spray equipment manuals or are readily available from the spray equipment manufacturers or powder suppliers. Modifications can be necessary for your location and product application. For sprayability testing, refer to TASK 70-49-00-340-001, Thermal Spraying, and TASK 70-70-00-700-001, Testing and Quality Analysis. When the final spray parameter settings are developed, all values must be recorded to ensure consistent achievement of high quality coatings.
TASK 70-49-56-340-804
1 . Quality Assurance.
Subtask 70-49-56-340-005
A.Thickness.
Measure the coating thickness using a standard flat-anvil-and-spindle micrometer. The measurement can be made on either a coated production part of on a flat test specimen having a thickness of at least 0.060 inch (1.52 mm). Determine coating thickness to the nearest 0.001 inch (0.03 mm) at three different locations.
B.Appearance.
Visual examination of the coating must be in accordance with the following:
(1)Adhesion.
The coating must exhibit no spalling or lifting.
(2)Coverage.
The coating must exhibit complete, uniform coverage in those areas specified for coating in the Engine Shop Manual. Coating is not permissible in areas other than those specified.
(3)Surface condition.
The coating must be uniform and free from cracks, blisters, spatter, chipping, and flaking.
C.Coating Microstructure.
Test specimens must be prepared for microscopic examination, and evaluated in accordance with TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings.
Metallographic examination of the prepared specimen must be made for uniformity of coating, as well as for the following other conditions:
(1)Delaminations.
The coating must be free of delaminations as defined for metallic coatings in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings.
(2)Integrity.
The coating must show acceptable integrity as defined in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings.
(3)Interface Separation.
The coating must be free of interface separations as defined in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings.
(4)Transverse Cracks.
The coating must be free of transverse cracks as defined for metallic coatings in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings.
(5)Interface Contamination.
Interface contamination in the coating must be identified as defined in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings, and then rated per the guidelines of Table 1.
(6)Oxides and Oxide Clusters.
Oxides and oxide clusters will be as defined in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings, and then rated as described in the guidelines of Table 1. Oxides must be uniformly distributed.
(7)Porosity.
Porosity in the coating must be classified for size as defined in TASK 70-71-04-700-005, Metallographic Evaluation of Thermal Spray Coatings, and then rated per the guidelines of Table 1. Porosity must be uniformly distributed.
D.Tensile.
Tensile specimens must be prepared for tensile bond testing and evaluated in accordance with TASK 70-71-01-700-002, Bond Strength Tensile Testing of Thermal Spray Coatings. Tensile bond strength for this coating at room temperature must be 7000 psi (48.2 MPa) minimum.
 
Acceptance Limits for Thermal Spray - Table 1
 
Feature
Acceptance Criteria
Rating Photograph
Task
Comments
 
Porosity
Less than or equal to V-1
Figure 25
TASK 70-71-04-700-005
None
 
Oxides
Less than or equal to X-3
Figure 6
TASK 70-71-04-700-005
None
 
Oxide Clusters
Less than or equal to X-3
Figure 6
TASK 70-71-04-700-005
None
 
Interface Contamination
Less than or equal to I-2
Figure 7
TASK 70-71-04-700-005
None
 
Interface Separations
None allowed
No figure for rating
TASK 70-71-04-700-005
See definition for ratable size
 
Transverse Cracks
None allowed
No figure for rating
TASK 70-71-04-700-005
None
 
Delaminations
None allowed
No figure for rating
TASK 70-71-04-700-005
See definition for ratable size