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Self-lubricated bearing is one of the oldest industrial applications. Wear reduction by increasing the material hardness and reducing friction coefficient can be achieved by alloying addition. This research studied effects of sintering time and temperature, alloyment of aluminum to sintered properti...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | |
| التنسيق: | Theses and Dissertations |
| اللغة: | Thai |
| منشور في: |
จุฬาลงกรณ์มหาวิทยาลัย
2009
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://digiverse.chula.ac.th/Info/item/dc:44052 |
| الوسوم: |
إضافة وسم
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| الملخص: | Self-lubricated bearing is one of the oldest industrial applications. Wear reduction by increasing the material hardness and reducing friction coefficient can be achieved by alloying addition. This research studied effects of sintering time and temperature, alloyment of aluminum to sintered properties of Cu-10wt%Sn. It was found that addition of aluminum from 1 to 10wt% reduced the sintered material density, increased porosity; hardness was decreased, and wear rate increased. Materials sintered at 830°C had increased density, with decreased porosity, and increased hardness, when the sintering time increased from 5 to 90 min. The highest hardness was obtained when sintering time was 60 min. For material without aluminum addition (0wt%Al), 5wt%Al, 10wt%Al, the hardness were 75.5, 33.9, 32.3 HV, densities were 6.87, 5.12, 4.25 g/cb.cm, having porosity of 18.7, 32.7, 37.3 vol%, respectively. Materials sintered at 900°C had decreased density, with increased porosity, and decreased hardness, when the sintering time increased from 5 to 90 min. The highest hardness was obtained when sintering time was 30 min. For material without aluminum addition (0wt%Al), 5wt%Al, 10wt%Al, the hardness were 54.4, 51.3, 31.9 HV, densities were 7.81, 6.63, 5.44 g/cb.cm, having porosity of 9.5, 15.3, 27.9 vol%, respectively. Heat treatment of sintered materials (900°C, 30 min) by heating to 750°C and quenching in water improved hardness of 5wt% and 10wt%Al materials, increasing from 51.3 to 69.2 HV, and from 31.9 to 39.6 HV, which were 37% and 25% increase, respectively. Mass loss from wear test of 5wt%Al and 10wt%Al reduced from 60.95 to 41.80 mg, and from 97.65 to 89.35 mg, which were 31% and 8%, respectively. |
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