National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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Spark-Shower Radiance of Metal Grinding Sparks.

PB234056

Publication Date	1974
Personal Author	Kelley, J. E.; Blickensderfer, R.
Page Count	30
Abstract	A method for measuring the spark-shower radiance of metals when abraded on a grinding wheel was developed for evaluating their sparking tendency. The radiance was measured in units of emissive power per solid angle per area of the detector. Over 100 metals were tested and rated relative to commercially pure iron. The metals tested included iron binary and ternary alloys, iron-carbon ternary alloys, commercial steels, nonferrous alloys, and a few hard-metal compounds. Plain-carbon steels, heat treated to a variety of hardnesses, gave radiance values which generally increased with increasing hardness. Recommendations are made for selection of metals for use in hazardous explosive atmospheres such as found in coal mines on the basis of the findings of this study. (Modified author abstract)
Keywords	Machining Metals Ignition Radiance Measurement Iron Iron alloys Steels Alloys Intermetallic compounds Coal mining Mine fires Mining research
Source Agency	Bureau of Mines
NTIS Subject Category	71J - Iron & Iron Alloys 71N - Nonferrous Metals & Alloys 48A - Mineral Industries
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Prepared by Albany Metallurgy Research Center, Oreg.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197419

Spark-Shower Radiance of Metal Grinding Sparks.

Spark-Shower Radiance of Metal Grinding Sparks.
PB234056

Publication Date	1974
Personal Author	Kelley, J. E.; Blickensderfer, R.
Page Count	30
Abstract	A method for measuring the spark-shower radiance of metals when abraded on a grinding wheel was developed for evaluating their sparking tendency. The radiance was measured in units of emissive power per solid angle per area of the detector. Over 100 metals were tested and rated relative to commercially pure iron. The metals tested included iron binary and ternary alloys, iron-carbon ternary alloys, commercial steels, nonferrous alloys, and a few hard-metal compounds. Plain-carbon steels, heat treated to a variety of hardnesses, gave radiance values which generally increased with increasing hardness. Recommendations are made for selection of metals for use in hazardous explosive atmospheres such as found in coal mines on the basis of the findings of this study. (Modified author abstract)
Keywords	Machining Metals Ignition Radiance Measurement Iron Iron alloys Steels Alloys Intermetallic compounds Coal mining Mine fires Mining research
Source Agency	Bureau of Mines
NTIS Subject Category	71J - Iron & Iron Alloys 71N - Nonferrous Metals & Alloys 48A - Mineral Industries
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Prepared by Albany Metallurgy Research Center, Oreg.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197419