Material coatings for valves: coal-liquefaction components and instrumentation. Final report, October 1, 1981-September 30, 1982

Technical Report · Tue Mar 01 04:00:00 EST 1983

OSTI ID:6290740

Curlee, R M; Hawn, D C

This report summarizes activities in the development of erosion-resistant coatings for the wear-prone parts of letdown and control valves used in coal-conversion process plants. Objectives were to demonstrate material and coating process concepts for industrial applications, initially the Exxon Donor Solvent ECLP facility and the Wilsonville pilot plant. Titanium diboride (TiB/sub 2/) coatings were deposited on tungsten carbide K701 cermets by chemical vapor deposition, but were not successfully deposited on other carbide substrates of interest, such as K703 and K801. Intermediary buffer coatings of metalic nickel were developed to reduce thermal stress and chemical incompatibilities between TiB/sub 2/ coatings and carbide substrates. Hot-pressed TiB/sub 2//Ni cermets were coated by chemical vapor deposition of TiB/sub 2/. Simulated slurry-erosion testing of carbide and TiB/sub 2/ substrates with TiB/sub 2/ coating was performed at Battelle Columbus Labs. Results of these tests showed that TiB/sub 2/-coated K701 eroded at one half the rate of the uncoated-K701 reference, and that one TiB/sub 2//Ni cermet showed no wear compared to the reference. Valve trim for the Exxon Donor Solvent ECLP facility was produced and tested under Texas lignite coal during the final 25 days of that plant's operation.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6290740
• Report Number(s): SAND-83-0410; ON: DE83010288
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
BORIDES
BORON COMPOUNDS
BROWN COAL
CARBIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CERMETS
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COAL
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COATINGS
COMPOSITE MATERIALS
CONTROL EQUIPMENT
DEPOSITION
DISPERSIONS
ENERGY SOURCES
EQUIPMENT
EROSION
EXXON LIQUEFACTION PROCESS
FLOW REGULATORS
FOSSIL FUELS
FUELS
INDUSTRIAL PLANTS
LIGNITE
LIQUEFACTION
MATERIALS
MIXTURES
NICKEL ALLOYS
PROTECTIVE COATINGS
RESEARCH PROGRAMS
SLURRIES
SURFACE COATING
SUSPENSIONS
THERMOCHEMICAL PROCESSES
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN CARBIDES
TUNGSTEN COMPOUNDS
VALVES