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Title: DJ-2700 Hybrid HVOF Response Surface and Process Vectors.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1266972
Report Number(s):
SAND2007-3126C
522976
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the MS&T 2007 held September 16-20, 2007 in Detroit, MI.
Country of Publication:
United States
Language:
English

Citation Formats

Hall, Aaron Christopher., and McCloskey, James F.. DJ-2700 Hybrid HVOF Response Surface and Process Vectors.. United States: N. p., 2007. Web.
Hall, Aaron Christopher., & McCloskey, James F.. DJ-2700 Hybrid HVOF Response Surface and Process Vectors.. United States.
Hall, Aaron Christopher., and McCloskey, James F.. Tue . "DJ-2700 Hybrid HVOF Response Surface and Process Vectors.". United States. doi:. https://www.osti.gov/servlets/purl/1266972.
@article{osti_1266972,
title = {DJ-2700 Hybrid HVOF Response Surface and Process Vectors.},
author = {Hall, Aaron Christopher. and McCloskey, James F.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

Conference:
Other availability
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  • High velocity, oxyfuel (HVOF) coating processes are fast becoming one of today`s dominant thermal spray areas, particularly for the deposition of carbide coatings where HVOF spray can produce results comparable, or even superior, to vacuum and air plasma spray processes. Results and analysis of NiCr, WC/Co, and Cr3C2NiCr coatings sprayed with the continuous detonation system (CDS) HVOF gun are presented. The investigation focused the influence of spray distance, gun/part relative speed, and fuel:oxygen ratio on coating microstructure, microhardness, and phase content. Coatings were sprayed using oxygen and propane (C{sub 3}H{sub 8}) fuel, at typical flow rates of 420 I/min, andmore » 55 I/min, respectively. Coatings were sprayed onto 25 x 75 mm (1 in. x 3in.) 1018-steel substrates, nominally 3 mm (01.25 in.) thick. The coating materials were (-45 {mu}m + 10 {mu}) 80/20 NiCr, (-45 {mu} + 11 {mu}) 88/12 WC/Co, and (-45 {mu} + 11 {mu}m) 75/25 Cr{sub 3}C{sub 2}/NiCr. The CDS HVOF sprayed coatings were analyzed by optical microscopy, microhardness (VHN{sub 300}) and X-ray diffraction techniques to determine the effects of variations in process parameters on the microstructure and characteristics of the coatings and to investigate phase changes in the coating material caused by the HVOF process.« less
  • Thermal spray has been selected as the coating process of choice for many OEM and repair/restoration applications. Although the thermal spray process has historically been limited to coating `line-of-sight` surfaces, advances in thermal spray equipment design now allow protective and/or restorative coatings to be applied to deep internal diameters utilizing state-of-the-art HVOF processing. The advanced designs include both `standard` and `mini` torches to coat rotating components, plus a rotating extension for coating stationary ID`s. In addition, a wide range of coating materials has been developed and engineered to combat the deleterious effects of wear found in severe service environments. Themore » resultant coatings have exceptionally high bond strength with no interconnected porosity and low residual stress. This unique process provides an important adjunct to the field of thermal spray process capabilities.« less
  • Eight different chromium carbide materials were sprayed at various conditions with the high pressure HVOF process. The coatings were erosion tested with both high and low angle impingement of erodent. All of the materials, including a less-expensive blended powder, exhibited excellent erosion resistance compared to standard plasma sprayed coatings. Other evaluations included metallographic examinations, macro and microhardness tests, bond tests, X-ray diffraction and chemical analyses. Several important correlations were investigated, including the effects of powder size and heat treatment.
  • The memory requirements of the Monte Carlo/S[sub N] hybrid method are large due to the need to store the Monte Carlo response matrix. This response matrix is used repeatedly during the iterative solution for the interface flux vectors. Although the length of these vectors can be large (depending on the number of discretized states on the Monte Carlo/S[sub N] interface), we have found that to an excellent approximation they can be expressed in terms of a small number of basis vectors. Representing the response matrix in terms of the basis vectors, we are able to greatly reduce storage requirements, andmore » to use direct inversion to estimate the converged interface fluxes.« less
  • The memory requirements of the Monte Carlo/S{sub N} hybrid method are large due to the need to store the Monte Carlo response matrix. This response matrix is used repeatedly during the iterative solution for the interface flux vectors. Although the length of these vectors can be large (depending on the number of discretized states on the Monte Carlo/S{sub N} interface), we have found that to an excellent approximation they can be expressed in terms of a small number of basis vectors. Representing the response matrix in terms of the basis vectors, we are able to greatly reduce storage requirements, andmore » to use direct inversion to estimate the converged interface fluxes.« less