Materials coatings for valves. Quarterly report, January 1-March 31, 1982
This quarterly report, for the period January 1-March 31, 1982, summarizes activities in the development of erosion resistant coatings for the wear-prone components of letdown and control valves used in coal liquefaction plants. These activities have followed a course of (1) material and process development of CVD (chemically vapor deposited) TiB/sub 2/ (titanium diboride) coatings; (2) erosion testing and screening of coated cermet substrates; and (3) prototype trim fabrication with associted development of fixturing and assembly hardware. Additional cemented carbide substrate materials (Kennametal K801 and K151A) were evaluated along with K701 and K703. Only the K701/TiB/sub 2/ combination has proven to be sufficiently reliable to warrant field testing in a process plant environment, and then only if the substrate has been precoated with electroplated nickel to promote adhesion between coating and carbide substrate and reduce thermophysical stresses. A cleaning and plating process has been developed to produce nickel precoats stable at the temperatures of CVD. TiB/sub 2/ coated specimens have been subjected to simulated slurry erosion testing at Battelle Columbus Labs (BCL) with some materials such as K701/TiB/sub 2/ and hot pressed (HP) TiB/sub 2//TiB/sub 2/ exhibiting very low erosion rates. Prototypes of the letdown valve plugs for the EDS and SRC-I processes have been fabricated and coated. Preliminary metallographic evaluation of the prototype plugs and descriptions of CVD furnace hardware are presented.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6694430
- Report Number(s):
- SAND-82-2137; ON: DE83003629
- Country of Publication:
- United States
- Language:
- English
Similar Records
Materials coatings for valves: coal-liquefaction components and instrumentation. Quarterly report, October 1-December 31, 1981
Evaluation of materials for use in letdown valves in coal-liquefaction systems. Final report
Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COATINGS
CONTROL EQUIPMENT
DEPOSITION
EQUIPMENT
EROSION
FABRICATION
FLOW REGULATORS
INDUSTRIAL PLANTS
LIQUEFACTION
MATERIALS
PERFORMANCE TESTING
SURFACE COATING
TESTING
THERMOCHEMICAL PROCESSES
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VALVES