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2010-5-25 · Bearing cages can be made of a variety of materials, generally, they are a polymer (i.e. plastic) and are usually the most fragile component of the entire turbine. The plastics used are very resistant to heat and have very low-friction as they directly contact the actual bearings.
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Get PricePurpose: To evaluate the marginal and internal cement thicknesses of inlay restorations made of various CAD/CAM materials using 3D X-ray micro-computed tomography (micro-CT) technique. Materials and methods: Caries-free extracted mandibular molars (N = 30) with similar size were randomly assigned to three groups (N = 10 per group). Mesio-occlusal-distal (MOD) cavities were prepared, and inlay ...
Get PriceTribological polymer composite materials are widely used in various industries. In particular, polymer composites with self-lubricating properties are of great interest in replacing metal parts in various friction units of machines and technical equipment. In this review, we systematically analyze the latest information on the development of ...
Get Price2021-1-15 · In this study, erosion wear tests in composites materials (carbon fiber and fiberglass) were performed in order to understand their behavior for blades of wind turbine applications. The erosion tests were also made in coated composites materials with a polyester resin (gel coat), to compare the wear erosion resistance with uncoated materials.
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Get PriceBall bearings used in dental highspeed handpieces reduce rotational friction to allow the spindle/chuck assembly in the turbine cartridge (and the bur, when inserted) to spin at speeds from 250,000 to 500,000 rpms. This makes the highspeed dental turbine one of the fastest rotating devices in the world. The highspeed ball bearing is comprised of:
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Get Price2021-1-15 · In this study, erosion wear tests in composites materials (carbon fiber and fiberglass) were performed in order to understand their behavior for blades of wind turbine applications. The erosion tests were also made in coated composites materials with a polyester resin (gel coat), to compare the wear erosion resistance with uncoated materials.
Get Pricespecific materials and architectures in restricted frequency ranges. A general framework is developed and employed to characterize the dynamics of polymer phononic materials with different architectures made of both thermoset and thermoplastic polymers, presenting qualitatively different viscoelastic behaviors.
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Get Price2021-1-28 · The aim of this study was, firstly, to analyse the long-time fatigue behaviour of crowns constructed from a novel polyetherketoneketone (PEKK) polymer, using artificial prepared teeth. Secondly, to determine the effect of the material’s stiffness that used as an artificial prepared tooth on the fatigue life of the PEKK crowns in comparison to human prepared teeth.
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Get PriceLesson 2: How Polymers Are Made. The links below provide an outline of the material for this lesson. Be sure to carefully read through the entire lesson before submitting your assignments. Overview/Checklist. How is a polymer formed?
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