MICROPOROSITY IN LEAD-ANTIMONY GRID ALLOYS

Abstract

Microscopic examination of over two-thousand grid cross sections, which had been obtained from the product of many different manufacturers, indicated that grid microporosity was very high. Using magnification as low as 45X, microporosity was found in 20% of the grids by random sampling. Examination at higher magnification showed much more microporosity to be present, and it is estimated that 40 to 50% of the cross sections would have been found to be porous if examined at higher magnification (800-1000X). Since the sampling was random, it is very probable that all of the cast grids had porosity at one or more points which could contribute to premature failure by corrosion.

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Document Details

Document Type
Technical Report
Publication Date
Jun 18, 1968
Accession Number
AD0672889

Entities

People

  • A. C. Simon

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Antimony
  • Antimony Alloys
  • Casting (Fabrication)
  • Castings
  • Crystals
  • Dendritic Structure
  • Fungi
  • Grain Boundaries
  • Materials
  • Natural Language Understanding
  • Observation
  • Particles
  • Phase Diagrams
  • Sampling
  • Storage Batteries
  • Temperature Gradients

Readers

  • Geodesy
  • Mathematics or Statistics
  • Metallurgy