Development of Test Methods for Antiseize Compounds

摘要

The seizure of threaded connections and other tight fits was found to result from galling of the contacting surfaces. A quantitative method was developed for measuring the galling characteristics of standard metal surfaces under controlled conditions. Anti-seize compounds can be evaluated by observing their effect on these measured characteristics. A seizure tester was designed and constructed which automatically records galling test data and can be used for rapid routing testing. Metal specimens which are used with this machine can be: (1) assembled with an anti-seize compound between the test surfaces, (2) exposed to conditions simulating specific applications, and then (3) tested for seizure. The results of seizure tests made with several commercial anti-seize compounds are included. A preliminary correlation was obtained between these testing procedures and other performance ratings. It is concluded that this basic test method can be used to evaluate anti-seize compounds for: (1) High temperature service (1200 - 2000 F), (2) Aircraft oxygen system service, (3) Liquid oxygen system service, and (4) Similar specific applications. (Author)