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Bearing materials adapted for unfavorable lubricating conditions. (in German)
SYSTEMATIC appropriate measurement values. The influence of friction corrosion on dynamic behaviour is dependent upon loading requirements. Rain Erosion Investigations of Surfaces in the Supersonic Range up to Mach 1.4. (in German) Presented at the Scientific Sot. for Aviation. Annual Meeting, Brunswick, N. J, Paper no. 61, (1962); 12 pp~ Sci. and Tech. Aerospace Repfs., I (I) (1963) 45, N 63-10056. To study the corrosive effects of rain on surfaces at supersonic speeds up to Mach 1.4, a device has been constructed to simulate the natural conditions of rain erosion. The equipment consists of: (a) a wind tunnel with a vertical test section in which the gravitational velocity and frictional force are synchronous with the time for rain spatter to corrode; (b) a rocket shield to imitate natural conditions; (c) a rotating arm with the test sample attached. To attain supersonic velocities around Mach 1.4 the single blade rotor was fashioned with a radius of 1.20 m and a foxwedge profile. In addition to,other factors, the temperature of the surface at the point of impact is critical in an analysis of rainerosion. For this purpose a nickel-chromium-nickel thermoelement is mounted so that the recordingpoint lies about 1-2 mm away from the test surface. The temperature as a function of the velocity without rain was measured. By separating the temperature of the rain and the temperature increase of the rain in action it is hoped to be able to determine the temperature of the test surface. Flooring Damage by Heels. l-I. J. Thorbum, Mat. Res. Std., a (9) (1962) 734-737; 6 fig., z tables, IO refs. Extensive damage to flooring caused by the stiletto heels of women’s shoes can be traced to the high pressures produced by heel diameters as smatl as 4 in. These pressures, which reach 2000 to 3000 p.s.i., are compared with other pressures. Some suggestions are made to those responsible for selecting flooring materiaIs.
.4BSTRAcTs
253
5.3 Bearing Materials Developments In Bearing Materials. P. G. Forrester, M~fal Id. (London), IOI (1962) x85-187; Batfelle Tech. Rev., II (12) (1962) no. 8572. Bearing Materials Adavted for Unfavorable Lubric&g Condition& (in German) B. Gossmann. n. Keller and C. Max. Frhr. von Meysenburg, 1/DI 2.. 104 (23) ~(1962) rI8g-1198. An investigation of some bearing materials showed that by using films of certain combinations of plastics, the requirements imposed by the operating conditions can be substantially complied with. Bearing Materials for Process Flufd Lubricants. M. B. Peterson, (1962); 41 pp., 53 refs. Sci. and Tech. Aerospace Repfs., I (I) (1963) 45, N 63-10096, Mechanical Technology, Inc., Latham, N.Y. Materials are being evaluated for use in bearings that can be lubricated with steam or water. Alloys of aluminum, cobalt, copper, tantalum, nickel, titanium, zirconium, iron, gold, silver, and platinum have been compared for the following characteristics: solubilitv. formation of soift-oxide films, crystal strutture, melting temperature, recrystallization temperature, thermal conductivity, and hardness. As a result of this evaluation, the alloys of cobalt, copper, platinum, and gold have been selected for further consideration. Sliding Friction Tests with Teflon. (in German) K. Wellinger, H. Uetz and V. Hakenjos, T/.D.I.z., 104 (28) (1962) 1343-1440. Sliding tests with disks of Teflon-like materials on plates of various other materials were carried out. Favorable qualities were found for friction bearings without lubrication.
6. ANALYSIS AND TESTING
Rhenium-bearing Thermocouples. Batfelle Tech. Rev., 12 (1963) 12. Rhenium-bearing termocouples capable of measuring temperatures of 25ooT or higher are proving an economical substitute for thermocouples employinganelementof pure rheniu m.Thermocouples based on the rhenium-bearing alloys, say Battelle scientistswho developed the new type of thermocouple, possess several advantages over those employing a pure rhenium wire junction element, while retaining the desirable features of the pure rhenium type. Suitable rhenium alloys are much less
expensive than the pure rhenium, and it is far less difficult to prepare thermocouple wire from the alloys than from the pure rhenium. Apart from their high melting point, the new thermocouples provide high thermoelectric power, which is critical to sensitivity and precision of temperature measurements. The linear characteristics of the tungsten vs. tungsten-25 rhenium couples make it especially desirable for high-temperaturemeasuring applications. Critical in the preparation of the new thermocouples is wire drawn from rhenium-bearWear,
6 (1963) 243-255
.4BSTRAcTs
253
5.3 Bearing Materials Developments In Bearing Materials. P. G. Forrester, M~fal Id. (London), IOI (1962) x85-187; Batfelle Tech. Rev., II (12) (1962) no. 8572. Bearing Materials Adavted for Unfavorable Lubric&g Condition& (in German) B. Gossmann. n. Keller and C. Max. Frhr. von Meysenburg, 1/DI 2.. 104 (23) ~(1962) rI8g-1198. An investigation of some bearing materials showed that by using films of certain combinations of plastics, the requirements imposed by the operating conditions can be substantially complied with. Bearing Materials for Process Flufd Lubricants. M. B. Peterson, (1962); 41 pp., 53 refs. Sci. and Tech. Aerospace Repfs., I (I) (1963) 45, N 63-10096, Mechanical Technology, Inc., Latham, N.Y. Materials are being evaluated for use in bearings that can be lubricated with steam or water. Alloys of aluminum, cobalt, copper, tantalum, nickel, titanium, zirconium, iron, gold, silver, and platinum have been compared for the following characteristics: solubilitv. formation of soift-oxide films, crystal strutture, melting temperature, recrystallization temperature, thermal conductivity, and hardness. As a result of this evaluation, the alloys of cobalt, copper, platinum, and gold have been selected for further consideration. Sliding Friction Tests with Teflon. (in German) K. Wellinger, H. Uetz and V. Hakenjos, T/.D.I.z., 104 (28) (1962) 1343-1440. Sliding tests with disks of Teflon-like materials on plates of various other materials were carried out. Favorable qualities were found for friction bearings without lubrication.
6. ANALYSIS AND TESTING
Rhenium-bearing Thermocouples. Batfelle Tech. Rev., 12 (1963) 12. Rhenium-bearing termocouples capable of measuring temperatures of 25ooT or higher are proving an economical substitute for thermocouples employinganelementof pure rheniu m.Thermocouples based on the rhenium-bearing alloys, say Battelle scientistswho developed the new type of thermocouple, possess several advantages over those employing a pure rhenium wire junction element, while retaining the desirable features of the pure rhenium type. Suitable rhenium alloys are much less
expensive than the pure rhenium, and it is far less difficult to prepare thermocouple wire from the alloys than from the pure rhenium. Apart from their high melting point, the new thermocouples provide high thermoelectric power, which is critical to sensitivity and precision of temperature measurements. The linear characteristics of the tungsten vs. tungsten-25 rhenium couples make it especially desirable for high-temperaturemeasuring applications. Critical in the preparation of the new thermocouples is wire drawn from rhenium-bearWear,
6 (1963) 243-255