DEVELOPMENT OF BONDING METHODS AND MATERIALS FOR RESISTANCE STRAIN GAGES

Technical Report · Sat Nov 01 04:00:00 EST 1958

OSTI ID:4828036

Rechter, H L

Work performed in formulating cements is reported. An attempt was made to develop a cement useful to temperatures of 1600 deg F and higher, having adequate electrical and load-bearing properties. Compositions of low alkaline colloidal silicas, aluminum phosphate, and silica fillers were found to provide excellent electrical propenties to 1400 deg F with gages formed from Armour D alloy. Above this temperature, oxidation of the alloy interfered with gage readings, but the cements may be useful to higher temperatures with a suitable gage. Strain transmission, adherence, and thermal cycling properties were excellent. However, such cements nnust be cured similarly to Allen P-1 cement. Compositional studies resulted in formulations, with a potassium silicate binder, which can be cured at water drying temperatures, about 220 deg F, and provide excellent physical properties and fair electrical behavior. Moisture adsorption causes high electrical leakage at room temperature with the better experimental compositions. Silicone impregnations after each heating cycle provides an adequate moisture barrier. (auth)

• Research Organization: Illinois Inst. of Tech., Chicago. Armour Research Foundation
• NSA Number: NSA-16-025560
• OSTI ID: 4828036
• Report Number(s): NAMC-ASL-1050(Pt.III)
• Country of Publication: United States
• Language: English

Related Subjects

ALKALI METALS
ALLOYS
ALUMINUM PHOSPHATES
CEMENTS
COLLOIDS
DEFORMATION
ENGINEERING AND EQUIPMENT
GAGES
HEAT TREATMENTS
HUMIDITY
IMPREGNATION
MECHANICAL PROPERTIES
OXIDATION
POTASSIUM SILICATES
SILICON OXIDES
SILICONES
STRAIN GAGES
TEMPERATURE