Falex test

Falex test—a method for determining the extreme-pressure (EP) or anti-wear properties of oils and greases. Vee blocks (with a large "V"-shaped notch) are placed on opposite sides of a rotating steel shaft, and the apparatus is immersed in a bath of the test lubricant. Load is automatically in-... 

Hopkins and Campbell used Dual Rub-Shoe and Falex test machines to study the wear lives of a series of polyimide-bonded molybdenum disulphide coatings, with initial coating thicknesses varying from 2.5 //m to 25 yi/m. Both test machines use line contact, and they calculated the initial contact zone stresses as 276 MPa and 669MPa respectively, reducing to 103 MPa and 171 MPa by the end of testing. They... 

IV has the best durability. Falex tests with 3566 N jaw load at 3.3 cm/s rate durability in the order I-II-III-IV in the temperature range 366-588 K (200-600 F). The durability of composition I at room temperature decreases by a factor of 6.7 for an increase in load from 2185 N to 64.73 N, but its durability is approximately three times better than that of the other three formulas. 

Friction force (ASTM method D2714-the Falex block-on-ring test). The... 

A combination of ZDDP and hard-core RMs leads to a synergistic effect of metallic detergents on the degradation of ZDDP. These phenomena are observed in many tests and can be explained in terms of (a) the acid neutralization property of hard-core RMs that leads to the prevention of decomposition of ZDDP (in the valve train wear test and the thin film oxygen uptake test), (b) the competitive adsorption of detergents that reduce the effective concentration of ZDDP on the metal surface (in the four-ball test), (c) the formation of mixed films on the metal surface, formed through the decomposition of ZDDP in the presence of hard-core RM s (the coefficient of friction in the Falex wear test). 

The best performance found in the Climax Molybdenum Company test programme was for a lithium hydroxystearate soap-thickened grease with a conventional EP additive and 10% by weight of molybdenum disulphide with a nominal particle size of 7.0 jum. This grease had a Timken OK Load of 23 lbs (10.5 kg), Falex load capacity of 1450 lbs (658 kg). Mean Hertz Load of 90.5 and Weld Load of 630 kg. 

This remarkable ability to lubricate deformation of steel can be readily demonstrated in the laboratory with the two common test machines, the Shell Four-Ball Machine and the Falex Pin and V-Block Tester. As described previously in Chapter 5, lubricants with more than about 35% of molybdenum disulphide will result in extrusion of steel test pieces at temperatures little higher than room temperature. In both cases the surface area of the specimens is increased by about 200% at low power smoothly and without pick-up on the counterfaces. 

Falex (Direct Scale) 2500 Lbs./50 In.-Lbs. Cast Iron Block Corrosion Test Pass Appearance Clear pH 9.6... 

In the Falex Multi-Specimen Friction Wear Test instrument, the ball and disk are enclosed in a cup, which is then filled with 50 mL of lubricant before the test, so as to completely immerse the ball-and-disk assembly in the lubricant. As described below, the lubricant is a solution with a known concentration of vegetable oil or methyl ester in hexadecane. Friction was measured at room temperature (25°C 2 C) for 15-30 min at 6.22 mm/s (5 rpm) and 181.44-kg load. The temperatures of the specimen and lubricant increased by only l°C-2 at the end of each test period. Two tests were conducted with each lubricant sample using a new set of ball-and-disk specimens for each test. The COFs from the duplicate tests were then averaged to obtain the COF of the lubricant being tested. In general, the standard deviation of the COFs from the duplicate runs was less than 5% of their mean. 

D2670 Test Method for Measuring Wear Properties of Fhnd Lubricants (Falex Kn and Vee Block M iod) Teeth wear apparatus-specific measumnent of wear... 

ASTM 02670-95(2004) Standard Test Method for Measuring Wear Properties of Fluid Lubricants (Falex Pin and Vee Block Method)... 

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