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首页> 外文会议>Society of Tribologists and Lubrication Engineers annual meeting amp; exhibition 2009 >Shouldn't Grease Upper Operating Temperature Claims Have a Technical Basis?
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Shouldn't Grease Upper Operating Temperature Claims Have a Technical Basis?

机译：润滑上工作温度要求不应该有技术依据吗？

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摘要

Grease high-temperature claims based on different standards can vary widely. The range of approaches commonly used in the industry to define the maximum temperature at which a grease will provide adequate lubrication can be confusing for customers wishing to select the best product for their application. A lubrication decision based upon a published grease temperature range can lead to undesired consequences unless the user understands the basis for the high-temperature limit being claimed.rnAn industry standard approach to high temperature claims would be preferable to the various claims made by suppliers today. Such a basis would be far superior to the "rule-of-thumb" guidance provided in the NLGI Lubricating Grease Guide (Maximum Usable Temperature in the Grease Application Guide table) which is based solely on thickener type, and would benefit consumers and producers alike, reducing confusion in the marketplace. For example, not all lithium complex greases are the same. Complexing agents, manufacturing methods and base oil type can influence the high-temperature performance of a lithium complex, or for that matter, any high-temperature grease.rnFactors limiting grease high-temperature performance include degradation due to oxidation, and/or the loss of base oil from bleed and evaporation. In general, dynamic grease life determinations based on standardized bearing tests better represent what occurs in the field, providing a measure of grease high-temperature performance limits which is more realistic than claims based on dropping point.rnA test program was conducted on nine commercial greases, which included DIN 51821 FAG FE9 Life, ASTM D4290 Wheel Bearing Leakage, ASTM D2265 Dropping Point, and ASTM D5483 PDSC testing, and the test results were compared to product data sheet claims. Interesting discrepancies were found between product high temperature claims and their relative ratings based on FE9 or Wheel Bearing Leakage testing.rn1. Significant differences were found between these nine greases' high temperature claims and their relative rankings based on each of the four tests inrnthe program. - Some data sheet claims carry more risk to the end user than others.rn2. Several of the greases' high temperature claims appeared to be risky or worse by more than one test.rn3. One grease appeared to have a safe claim based on dynamic or PDSC testing, but seemed risky by dropping point.rn4. There was no correlation observed between drop point and either of the dynamic tests.rn5. There was no correlation observed between FE9 and HTWB life rankings.rnIt still appears that an industry standard approach to making high temperature claims for greases would be vastly better than the current confusing and conflicting rule of thumb industry guidance. The claims made on several grease's data sheets compared to their performance in dynamic life tests illustrates the sometimes substantial end user risks existing today. However, given the lack of correlation between the dynamic life tests used in this test program, the mechanism of failure for various greases in these and other dynamic tests needs to be further investigated.
机译：基于不同标准的油脂高温要求可能会大相径庭。对于希望为自己的应用选择最佳产品的客户，在行业中通常使用的定义润滑脂能够提供充分润滑的最高温度的方法范围可能会造成混淆。除非用户理解要求的高温极限的依据，否则基于已发布的润滑脂温度范围的润滑决策可能会导致不良后果。高温要求的行业标准方法要优于当今供应商提出的各种要求。这样的基础将大大优于仅基于增稠剂类型的《 NLGI润滑脂指南》（《润滑脂应用指南》表中的最高可用温度）中提供的“经验法则”指南，这将使消费者和生产者受益，减少市场混乱。例如，并非所有的锂复合润滑脂都相同。络合剂，制造方法和基础油类型可能会影响锂络合物的高温性能，或与此有关的任何高温润滑脂。rn限制润滑脂高温性能的因素包括由于氧化而引起的降解和/或损失。流失和蒸发产生的基础油。通常，基于标准化轴承测试的动态润滑脂寿命确定可以更好地反映现场发生的情况，从而提供了一种比基于滴落点的润滑脂更现实的润滑脂高温性能极限测量方法。rn针对9种商用润滑脂进行了测试程序，其中包括DIN 51821 FAG FE9寿命，ASTM D4290车轮轴承泄漏，ASTM D2265滴点和ASTM D5483 PDSC测试，并将测试结果与产品数据表中的要求进行了比较。根据FE9或车轮轴承泄漏测试，发现产品高温声明与其相对额定值之间存在有趣的差异。根据程序中的四个测试中的每一个，发现这九种润滑脂的高温要求与其相对等级之间存在显着差异。 -一些数据表声称对最终用户带来的风险要大于其他一些说法。经过一项以上的测试，其中几种润滑脂的高温声称似乎具有风险或更差。根据动态测试或PDSC测试，一种润滑脂似乎可以安全声称，但在下降点时似乎有风险。落点与任何动态测试之间均未发现相关性。在FE9和HTWB寿命等级之间没有发现相关性。rn似乎仍然存在一种行业标准的方法来对油脂进行高温声称，这要比目前令人困惑和相互矛盾的拇指行业指南更好。与在动态寿命测试中的性能相比，在几种润滑脂的数据表上所作的声明表明，当今有时存在巨大的最终用户风险。但是，由于此测试程序中使用的动态寿命测试之间缺乏相关性，因此需要进一步研究这些润滑脂和其他动态测试中各种润滑脂的失效机理。

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