1.1 本试验方法包括用试验机测定自润滑材料在摩擦接触中的磨损率和摩擦系数 2 利用止推垫圈样本配置。 附注1: 该机器也可用于测量摩擦系数。 1.2 以SI单位表示的数值应被视为标准。如果材料、产品或设备仅以英寸-磅为单位，则括号中的SI值仅供参考。 1.3 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.4 本国际标准是根据《关于制定国际标准的原则的决定》中确立的国际公认的标准化原则制定的世界贸易组织技术性贸易壁垒委员会发布的rds、指南和建议。 ======意义和用途====== 5.1 本试验方法用于测定在有用操作条件下，即压力和速度的组合低于 PV （压力×速度）测试材料的极限。本试验方法的用户应自行确定本试验程序的结果是否与现场性能或其他台架试验机相关。如果测试条件改变，磨损率可能改变，并且一种材料相对于另一种材料的相对值也可能改变。 5.2 测试条件可以选自 表1 . (a) 对于许多应用，磨损率超过1.0 × 10 − 5 in./h（2.5 × 10） − 7 m/h)被认为是过量的。一些常用材料在不同条件下的典型磨损率 PV 级别为: 缩醛均聚物 PV 1 : 5 × 10 − 6 英寸/小时至1 × 10 − 5 in./h(1.3 × 10 − 7 m/h至2.5 × 10 − 7 m/h） 缩醛均聚物 PV 2 : 1 × 10 − 5 英寸/小时至3 × 10 − 5 in./h（2.5 × 10） − 7 m/h至7.5 × 10 − 7 m/h） 22%PTFE填充的缩醛均聚物 PV 2 : 3 × 10 − 6 英寸/小时至6 × 10 − 6 in./h(7.5 × 10 − 8 m/h至1.5 × 10 − 7 m/h） 聚酰胺（6-6型）at PV 2 : 1 × 10 − 5 英寸/小时至5 × 10 − 5 in./h（2.5 × 10） − 7 m/h至1.3 × 10 − 6 m/h） 15%石墨填充聚酰亚胺 PV 3 : 1 × 10 − 5 英寸/小时至2 × 10 − 5 in./h（2.5 × 10） − 7 m/h至5 × 10 − 7 m/h） 5.3 磨损测量的精度与试验持续时间或磨损量相对无关，但磨损率（计算）的精度随着试验持续时间和磨损量的增加而提高。通常认为，有用的磨损率精度需要选择足以产生0.1 mm(0.004 in.)磨损的测试持续时间。测试持续时间通常在50小时至4000小时的范围内。

1.1 This test method covers the determination of wear rate and coefficient of friction for self-lubricated materials in rubbing contact by a testing machine 2 that utilizes a thrust washer specimen configuration. Note 1: This machine may also be used to measure coefficient of friction. 1.2 The values in SI units are to be regarded as the standard. In cases where materials, products, or equipment are available only in inch-pound units, SI values in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is used to determine the equilibrium rate of wear and coefficient of friction of materials in rubbing contact under useful operating conditions, that is, combinations of pressure and velocity that fall below the PV (pressure × velocity) limit of the test material. The user of this test method should determine to his own satisfaction whether the results of this test procedure correlate with field performance or other bench test machines. If the test conditions are changed, the wear rates may change and the relative value of one material with respect to another may also change. 5.2 Test conditions may be selected from Table 1 . (A) For many applications a wear rate exceeding 1.0 × 10 − 5 in./h (2.5 × 10 − 7 m/h) is considered excessive. Typical wear rates for some commonly used materials at different PV levels are: Acetal homopolymer at PV 1 : 5 × 10 − 6 in./h to 1 × 10 − 5 in./h (1.3 × 10 − 7 m/h to 2.5 × 10 − 7 m/h) Acetal homopolymer at PV 2 : 1 × 10 − 5 in./h to 3 × 10 − 5 in./h (2.5 × 10 − 7 m/h to 7.5 × 10 − 7 m/h) 22 % PTFE-filled acetal homopolymer at PV 2 : 3 × 10 − 6 in./h to 6 × 10 − 6 in./h (7.5 × 10 − 8 m/h to 1.5 × 10 − 7 m/h) Polyamide (Type 6-6) at PV 2 : 1 × 10 − 5 in./h to 5 × 10 − 5 in./h (2.5 × 10 − 7 m/h to 1.3 × 10 − 6 m/h) 15 % graphite filled polyimide restin at PV 3 : 1 × 10 − 5 in./h to 2 × 10 − 5 in./h (2.5 × 10 − 7 m/h to 5 × 10 − 7 m/h) 5.3 The precision of wear measurement is relatively independent of test duration or amount of wear, but the precision of wear rate (calculation) improves with test duration and amount of wear. It is generally believed that useful wear rate precision requires the selection of a test duration sufficient to produce 0.1 mm (0.004 in.) of wear. Test durations will often be in the 50 h to 4000 h range.