Design of a substrate heater for calcium hydroxyapatite coating by pulsed laser ablation

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Description

Calcium hydroxyapatite (HA) is the main chemical constituent of bone. When replacement hip joints are coated with this chemical, the body may be more likely to accept the artificial joint, forming new bone that bonds the joint to the original leg bone. HA deposited by laser ablation in vacuum adheres to the substrate better at high temperatures of up to 700 C. This heater should be capable of uniformly heating to 700 C a silicon disk 150 mm in diameter. The heater consists of two wire heating coils brazed into a disk of stainless steel, with tantalum shields on top ... continued below

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25 p.

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Chang, T. & Havstad, M.A. July 24, 1995.

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Description

Calcium hydroxyapatite (HA) is the main chemical constituent of bone. When replacement hip joints are coated with this chemical, the body may be more likely to accept the artificial joint, forming new bone that bonds the joint to the original leg bone. HA deposited by laser ablation in vacuum adheres to the substrate better at high temperatures of up to 700 C. This heater should be capable of uniformly heating to 700 C a silicon disk 150 mm in diameter. The heater consists of two wire heating coils brazed into a disk of stainless steel, with tantalum shields on top and at the sides of the heater to minimize radiation loss. Three spring-rotation clamps at the bottom of the heater hold the substrate disk in place. This report describes the heater and how it was developed, including design evolution and thermal modeling. Also, detailed information about parts is discussed.

Physical Description

25 p.

Notes

OSTI as DE96000839

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  • Other Information: PBD: 24 Jul 1995

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  • Other: DE96000839
  • Report No.: UCRL-ID--121808
  • Report No.: L--19757-1
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/113932 | External Link
  • Office of Scientific & Technical Information Report Number: 113932
  • Archival Resource Key: ark:/67531/metadc626531

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • July 24, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 1:24 p.m.

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Chang, T. & Havstad, M.A. Design of a substrate heater for calcium hydroxyapatite coating by pulsed laser ablation, report, July 24, 1995; California. (digital.library.unt.edu/ark:/67531/metadc626531/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.