🔍 Key Concepts

• Properties of graphite and other solid lubricants at high temperatures • Differences between antifriction (rolling element) bearings and plain bearings • How suspended solid additives behave in circulating oil systems

💭 Think About

• In which type of bearing would small solid particles be least likely to cause surface pitting or blockage of tight clearances? • How does graphite behave as temperature increases compared with normal mineral oil? • Which of these systems is most tolerant of contaminants or solid particles in the lubricant?

✅ Before You Answer

• Identify which listed bearings typically use circulating oil systems with fine clearances (more sensitive to solids) • Consider which application is designed to run at elevated temperatures where normal oil films may break down • Ask whether the lubricant passes through small oil passages or tight rolling-element contacts that could be harmed by solid particles