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Article analysis:

The article is generally reliable and trustworthy as it provides detailed information about the tribological performance of a filled PTFE-based friction material for ultrasonic motors under different temperatures and vacuum degrees. The authors have provided evidence to support their claims by conducting experiments to measure the no-load speed, output power, and holding torque of the motor at room temperature under atmospheric environment. Furthermore, they have discussed the evolution of friction-wear modes and mechanisms as a function of temperature and vacuum degree which further adds credibility to their findings.

However, there are some potential biases that should be noted when assessing this article's trustworthiness. Firstly, the authors do not provide any information on possible risks associated with using this type of material in an ultrasonic motor or any other application for that matter. Secondly, they do not present both sides equally when discussing the effects of temperature and vacuum degree on tribological behavior; instead they focus mainly on how these factors affect wear mechanisms rather than exploring counterarguments or alternative perspectives on this issue. Finally, there is some promotional content in the article which could lead readers to believe that this type of material is superior to other materials without providing sufficient evidence to back up such claims.