Mechanical properties of seals in high pressure sodium lamp

Zoltán Tóth, Gábor Steinbach, A. Juhász

Research output: Contribution to journalArticle

Abstract

Vickers hardness and Young's modulus of the different phases of High Intensity Discharge Lamp seal has been characterized using depth-sensitive micro-indentation. Based on the length of the cracks initiated during indentation critical fracture toughness and stress anisotropy has been calculated. To reveal the brittle properties of the seal a cracking statistics method has been developed which allows characterization of samples with characteristic size below 1 mm. Vickers hardness and Young's modulus is homogenous in the seal. There is a tangential tensile stress and compressive radial residual stress in the sealing. Cracking properties of the two main phases of the sealing were found to be different.

Original languageEnglish
Pages (from-to)483-488
Number of pages6
JournalMaterials Science Forum
Volume473-474
Publication statusPublished - 2005

Fingerprint

Vickers hardness
sealing
indentation
Electric lamps
luminaires
Seals
modulus of elasticity
Sodium
sodium
mechanical properties
Indentation
Mechanical properties
Elastic moduli
fracture strength
tensile stress
Discharge lamps
residual stress
cracks
statistics
Tensile stress

Keywords

  • Alumina
  • Cracking statistics
  • Depth-sensitive microindentation
  • Fracture toughness
  • High pressure sodium lamp sealing
  • Residual stress

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Mechanical properties of seals in high pressure sodium lamp. / Tóth, Zoltán; Steinbach, Gábor; Juhász, A.

In: Materials Science Forum, Vol. 473-474, 2005, p. 483-488.

Research output: Contribution to journalArticle

Tóth, Zoltán ; Steinbach, Gábor ; Juhász, A. / Mechanical properties of seals in high pressure sodium lamp. In: Materials Science Forum. 2005 ; Vol. 473-474. pp. 483-488.
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