HIGH TEMPERATURE MICRO-HARDNESS TESTER. Technical Report No. M-5
A micro-hardness tester has been cohstructed which will determine the hardness of a metals according to the Diamond Pyramid Hardness Number scales at temperatures up to 1650 deg F. Testing is done in a vacuum of approximately 10/ sup -3/ mm Hg. Indenter load is hydraulically applied and is controllable a within 1.2 grams over the range of 25 to 300 grams. Temperature is automatically controlled to plus or minus 2 plus or minus F over the entire testing range. Provision is made for making up to 150 indentations on each of as many as twelve specimens in one run, witthout breaking the vacuum or disturbing temperature equilibrium. This feature makes the instrument especially adaptable for quick survey of large numbers of specimens in a search for those with likely high temperature strengh properties. The lowest practical indenter load of 25 grams gives indentations small enough to make possible the study of phase changes in the microconstients of alloys at the temperatures at which the changes occur. By resorting to higher-melting point materials in the high-temperature components of the apparatuss the temperature limit of the apparatus could in all probability be extended to that imposed by the stability of the diamond indenter. (auth) l8O38 A hypothetical 20-kt nuclear detonation is considered, and the time required to complete the detonation and the peak power are calculated. Values of 0.55 mu sec and 1021 watts were obtained. The problems which relate to the telemetry of information away from the detonation are examined. A radio-linked telemetry system operating in the microwave region is used in a hypothetitcal test operation a illustrate the various problems. Typical equipment is described briefly. (W.D.M.)
- Research Organization:
- Kellex Corp. Silver Spring Lab., Md.
- DOE Contract Number:
- NORD-9829
- NSA Number:
- NSA-13-018037
- OSTI ID:
- 4241062
- Report Number(s):
- NP-7749
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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