Hardness improvement of Pb75% - Sb15% - Sn10% bearing alloy through reinforcement with 5% v/v SiO2 particulates

Öz

The work ‘Hardness Improvement of Pb75%-Sb15%-Sn10% Bearing Alloy through Reinforcement with 5% v/v SiO2 Particulates’ has been carried out. The research involved the development of the composite. The alloy matrix which was earlier developed in the foundry shop of NMDC was used for the production of the composite through the stir cast method. The bars were prepared into test specimens some of them were solution treated, age-hardened and then they were subjected to hardness test and microstructural examination. The result of the work revealed that the as cast sample had a hardness value of 34 HRB and showed improvement when compared with the hardness value of the matrix alloy used for the development of the composite which had a hardness value of 27.7 HRB. The highest value of 35 HRB occurred after 3 hrs of age-hardening the composite. The microstructural analysis confirmed the changes in the hardness values as it revealed the constituent phases of the composite at different ageing periods. The microstructure also agreed with revelations from Scanning Electron Microscope (SEM) images captured on similar alloys. The improved hardness recorded with the reinforcement of Pb75%-Sb15%-Sn10%alloy with particulate silica clearly confirms that the bearing alloy in the form of a composite can sustain heavier loads.

Anahtar Kelimeler

• Bearing alloy, composite, particulate, reinforcement, hardness improvement

Kaynakça

1. Khanna OP. Material Science and Metallurgy, 4th reprint, Dhanpat Rai Publications, 2008: 5 – 9.
2. Higgins RA. Properties of Engineering Materials, 5th edition, Hodder and Stoughton London, 1985: 140 – 142.
3. Ihom AP, Nyior GB and Ibrahim GZ. The effect of thermal ageing on microstructure and some mechanical properties of Al/2.0% glass reinforced composite. International J. Research and Reviews in Applied Sciences, 2012; 12 (3): 414 – 419.
4. “Quartz’’ Microsoft Encarta (2009) [DVD]. Redmond, WA: Microsoft Corporation, 2008.
5. Ihom AP, Nyior GB, Anbua EE and Ogbodo JN. The effect of ageing time on some mechanical properties of aluminium/0.5% glass reinforced particulate composite. Journal of Minerals and Materials Characterization and Engineering, 2012; 11: 919 – 923.
6. Ashby MF and Jones DRH. Engineering Materials 2, 27th reprint, Pergamon Publishers Oxford, 2001: 93 – 97.
7. Bolton W. Materials for Engineering, 8th Reprint, Butterworth-Heinemann Oxford Great Britain, 2000: 86 – 87.
8. Ihom AP, Nyior GB, Suleiman M and Ogbodo J. Precipitation hardening characteristics of aluminum matrix-glass reinforced composite. Novus Scientia Journal, 2012; 1(3): 10 – 18.

9. Esfandyarpour MJ and Mahmudi R. Microstructure and tensile behaviour of Sn- 5Sb lead-free solder alloy containing Bi and Cu. Material Science and Engineering: A, 2011; 530: 402 – 410.
10. El-Daly AA, Swilem Y and Hammad AE. Creep properties of Sn–Sb based lead- free solder alloys. Journal of Alloys and Compounds, 2009; 471 (1–2): 98 – 104.
11. Mathews FL and Rawlings RD. Composite Materials: Engineering and Science, 5th edition, Woodhead Publishing Limited, 2005: 6 – 15.
12. Hassan SB, Aponbiede O and Aigbodion VS. Precipitation hardening characteristics of Al-Si-Fe/SiC particulate composites. Journal of Alloys and Compounds, 2007; 1 – 10.
13. Hassan SB and Aigbodion VS. The effect of thermal ageing on microstructure and mechanical properties of Al-Si-Fe/ Mg alloys. Journal of Alloys and Compounds, 2009; 1 – 9.
14. Onche OE. The development of Al-Cu matrix composite reinforced with diatomite, PhD Research Work, FUT Minna Nigeria, 1 – 10, 2009.
15. Taylor JL. Basic metallurgy for nondestructive testing, Revised edition, The British Institute of Non-Destructive Testing, 2000: 46.