FABRICATION OF BERYLLIUM FINE WIRE. Progress Report No. 2, June 1, 1960 to August 1, 1960

Technical Report · Tue Oct 31 04:00:00 EST 1961

OSTI ID:4086372

Gross, A G; O'Rourke, R G; Beaver, W W

The wire-drawing apparatus described previously was completed and tested, and is being altered to include a variable-speed drive on the capstan. Facilities for cleaning the wire were installed. Since the surface conditions of the wire were found to become more important as the diameter decreased, an investigation was made of surface preparation techniques to find a commercially feasible solution which would effectively dissolve beryllium while improving the plastic flow properties of the surface. The solution containing 0.3 wt.% HF and 15.4 wt.% HNO/sub 3/ in water was the preferred mix and performed better at 70 deg C than at room temperature. As-received sample diameters were measured at three different longitudinal positions. The measurements were repeated during pickling in the HF-HNO/sub 3/ solution at 70 deg C, and the times for various amounts of surface removal were recorded. It was concluded that this concentration, when used at 75 plus or minus 5 deg C, produced a very uniform attack at a rate of approximately 0.005 in. of surface removal per minute. The treated wire was bend tested by making 180 deg free bends around mandrels of known diameter. Each specimen was wrapped on successively smaller mandrels until fracture occurred. The bend radii immediately preceding and at fracture were noted and were expressed as alpha , the ratio of the inside bend radius to the specimen diameter. The values of alpha are considered accurate to plus or minus 0.50. The test data are tabulated and given graphically as minimum bend radius as a function of stock removal. (B.O.G.)

• Research Organization: Brush Beryllium Co., Cleveland
• NSA Number: NSA-15-011535
• OSTI ID: 4086372
• Report Number(s): AD-243448
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIUM
CLEANING
CORROSION
CREEP
DIAGRAMS
DIES
DRAWING
FABRICATION
FAILURES
HYDROFLUORIC ACID
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NITRIC ACID
PREPARATION
SOLUTIONS
SURFACES
TABLES
TEMPERATURE
VELOCITY
WATER
WIRES