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Title: Abrasion resistant heat pipe

Abstract

A specially constructed heat pipe is described for use in fluidized bed combustors. Two distinct coatings are spray coated onto a heat pipe casing constructed of low thermal expansion metal, each coating serving a different purpose. The first coating forms aluminum oxide to prevent hydrogen permeation into the heat pipe casing, and the second coating contains stabilized zirconium oxide to provide abrasion resistance while not substantially affecting the heat transfer characteristics of the system.

Inventors:
Publication Date:
OSTI Identifier:
7260353
Patent Number(s):
US 4478275; A
Application Number:
PPN: US 6-516631
Assignee:
Thermacore, Inc., Lancaster, PA (United States) PTO; EDB-94-121205
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 25 Jul 1983
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 42 ENGINEERING; FLUIDIZED-BED COMBUSTORS; HEAT PIPES; CORROSION PROTECTION; PROTECTIVE COATINGS; WEAR RESISTANCE; ALUMINIUM OXIDES; HYDROGEN EMBRITTLEMENT; MITIGATION; SPRAY COATING; ZIRCONIUM OXIDES; ALUMINIUM COMPOUNDS; CHALCOGENIDES; COATINGS; COMBUSTORS; DEPOSITION; EMBRITTLEMENT; MECHANICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; SURFACE COATING; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 014000* - Coal, Lignite, & Peat- Combustion; 420400 - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Ernst, D.M. Abrasion resistant heat pipe. United States: N. p., 1984. Web.
Ernst, D.M. Abrasion resistant heat pipe. United States.
Ernst, D.M. 1984. "Abrasion resistant heat pipe". United States. doi:.
@article{osti_7260353,
title = {Abrasion resistant heat pipe},
author = {Ernst, D.M.},
abstractNote = {A specially constructed heat pipe is described for use in fluidized bed combustors. Two distinct coatings are spray coated onto a heat pipe casing constructed of low thermal expansion metal, each coating serving a different purpose. The first coating forms aluminum oxide to prevent hydrogen permeation into the heat pipe casing, and the second coating contains stabilized zirconium oxide to provide abrasion resistance while not substantially affecting the heat transfer characteristics of the system.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1984,
month =
}
  • A specially constructed heat pipe for use in fluidized bed combustors. Two distinct coatings are spray coated onto a heat pipe casing constructed of low thermal expansion metal, each coating serving a different purpose. The first coating forms aluminum oxide to prevent hydrogen permeation into the heat pipe casing, and the second coating contains stabilized zirconium oxide to provide abrasion resistance while not substantially affecting the heat transfer characteristics of the system.
  • Surfaces of fabricated structures are protected from damage by impacting particulates by a coating of hard material formed as a mass of thin flexible filaments having root ends secured to the surface and free portions which can flex and overlap to form a resilient cushioning mat which resembles hair or fur. The filamentary coating covers the underlying surface with hard abrasion resistance material while also being compliant and capable of local accommodation to particle impacts. The coating can also function as thermal and/or acoustical insulation and has a friction reducing effect. 11 figs.
  • In a heat pipe of the type having a hollow interior cavity with evaporator and condensor portions which is charged with sodium as a working fluid and having a wick lining at least a portion of the internal surface of the heat pipe housing, this patent describes the improvement comprising: the wick being formed of a mesh wherein zirconium threads are interwoven into the wick mesh so that, when the wick is installed within the heat pipe, oxygen therein will combine with the zirconium to form zirconium oxide, thus inhibiting the formation of corrosive sodium oxides.
  • A composite article and cutting tool are prepared by densification to form a body consisting essentially of particles of hard refractory material uniformly distributed in a matrix consisting essentially of a first phase and a second phase, said first phase consisting essentially of crystalline silicon nitride and said second phase being an intergranular refractory phase comprising silicon nitride and a suitable densification aid selected from the group consisting of yttrium oxide, zirconium oxide, hafnium oxide and the lanthanade rare earth oxides and mixture thereof.
  • An abrasion resistant coating is created by adding a ductile phase to a brittle matrix phase during spray coating where an Al-Cu-Fe quasicrystalline phase (brittle matrix) and an FeAl intermetallic (ductile phase) are combined. This composite coating produces a coating mostly of quasicrystal phase and an inter-splat layer of the FeAl phase to help reduce porosity and cracking within the coating. Coatings are prepared by plasma spraying unblended and blended quasicrystal and intermetallic powders. The blended powders contain 1, 5, 10 and 20 volume percent of the intermetallic powders. The unblended powders are either 100 volume percent quasicrystalline or 100more » volume percent intermetallic; these unblended powders were studied for comparison to the others. Sufficient ductile phase should be added to the brittle matrix to transform abrasive wear mode from brittle fracture to plastic deformation, while at the same time the hardness of the composite should not be reduced below that of the original brittle phase material.« less