ISSN: 2167-7670
Advances in Automobile Engineering
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Evaluation of Bio-field Treatment on Physical and Structural Properties of Bronze Powder

Snehasis Jana1*, Omprakash L1, Mahendra KT2, Gopal N2, Shrikant P2 and Mohan RT2
1Trivedi Science Research Laboratory Pvt. Ltd., Bhopal, Madhya Pradesh, India
2Trivedi Global Inc., 10624 S Eastern Avenue Suite A-969, Henderson, NV 89052, USA
Corresponding Author : Dr. Snehasis Jana
Trivedi Science Research Laboratory Pvt. Ltd.
Hall-A, Chinar Mega Mall, Chinar Fortune City
Hoshangabad Road, Bhopal- 462026 Madhya Pradesh, India
Tel: +91-755-6660006
E-mail: publication@trivedisrl.com
Received: June 22, 2015 Accepted: July 03, 2015 Published: July 07, 2015
Citation: Jana S, Omprakash L, Mahendra KT, Gopal N, Shrikant P, et al. (2015) Evaluation of Bio-field Treatment on Physical and Structural Properties of Bronze Powder. Adv Automob Eng 4:119. doi:10.4172/2167-7670.1000119
Copyright: © 2015 Jana S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Bronze, a copper-tin alloy, widely utilizing in manufacturing of gears, bearing, and packing technologies due to its versatile physical, mechanical, and chemical properties. The aim of the present work was to evaluate the effect of bio-field treatment on physical and structural properties of bronze powder. Bronze powder was divided into two samples, one served as control and the other sample was received bio-field treatment. Control and treated bronze samples were characterized using x-ray diffraction (XRD), particle size analyzer, scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy. XRD result showed that the unit cell volume was reduced upto 0.78% on day 78 in treated bronze as compared to control. Further, the crystallite size was significantly reduced upto 49.96% in treated bronze sample on day 106 as compared to control. In addition, the bio-field treatment has significantly reduced the average particle size upto 18.22% in treated bronze powder as compared to control. SEM data showed agglomerated and welded particles in control bronze powder, whereas fractured morphology at satellites boundaries were observed in treated bronze. The yield strength of bronze powder calculated using Hall- Petch equation, was significantly changed after bio-field treatment. The FT-IR analysis showed that there were three new peaks at 464 cm-1, 736 cm-1, and 835 cm-1 observed in treated bronze as compared to control; indicated that the bio-field treatment may alter the bond properties in bronze. Therefore, the bio-field treatment has substantially altered the characteristics of bronze at physical and structural level.

Keywords
Bio-field treatment; Bronze; X-ray diffraction; FT-IR; Particle size; SEM
Introduction
Bronze is a metallic alloy, primarily consist of copper and tin in 90:10 ratio, which is also known as “true bronze”. Some other elements such as arsenic, phosphorus, aluminium, manganese, and silicon are also blended in bronze to enhance its mechanical properties [1,2]. The variation in elemental composition in bronze significantly affects its mechanical and chemical characteristics [3]. Furthermore, the bronze, primarily exist in FCC (face centred cubic) crystal structure, and the different size of the tin atoms as compared to copper substantially changes this structure, which confers excellent properties. Sidot et al. reported that lattice parameter of FCC bronze unit cell increases with increase in tin content and vice versa [4]. Moreover, the influences of crystallite size on the mechanical properties of metals and alloys have been known for many years. Two scientist Hall and Petch proposed the formula, which demonstrated the inverse relation between yield strength and crystallite size [5]. Nevertheless, bronze is widely utilized in the production of bearing, operating under heavy loads at high speeds. These bearing are used in many rotating parts such as fans, jet engines, automobile parts, industrial equipment, and appliances etc. Beside this, it is also used in filters and decorative paints. Bronze powder is mainly produced via electrolysis process, vapour deposition, and high-energy ball mill method [6]. Further, it is reported that the mechanical properties in bronze can be modulated through various kind of sintering processes [7,8]. In these sintering processes, high temperature and costly equipment setup are required to achieve the desired mechanical properties. After considering of alloy properties and cost aspect, authors wanted to investigate an alternative and economically safe approach that could be beneficial in global application to modify the structural and mechanical properties of bronze powder.
A physicist, William Tiller proposed the existence of a new force related to human body, in addition to four well known fundamental forces of physics: gravitational force, strong force, weak force, and electromagnetic force. Fritz-Albert, a German biophysicist proposed that human physiology shows a high degree of order and stability due to their coherent dynamic states [9-12]. Furthermore, a human has ability to harness the energy from environment/universe and can transmit into any object (living or non-living) around the globe. The objects always receive the energy and responded into useful way and that is called bio-field energy. This process is known as bio-field treatment. Mahendra Trivedi’s bio-field treatment has been applied to transform the structural, physical, and chemical properties of various metals and ceramics [13-20]. In material science, this bio-field treatment has substantially changed the particle size, surface area and lattice parameters in various ceramic powders such as vanadium pentoxide (V2O5), zirconium oxide (ZrO2), and silicon dioxide (SiO2) [18,19]. The bio-field treatment has also transformed the characteristics in several other fields like biotechnology [21,22], microbiology [23-25], and in agricultural science [26-28].
Based on the outstanding results achieved by bio-field treatment on different materials and considering the industrial significance of bronze powder, the present study was undertaken to evaluate the impact of bio-field treatment on physical and structural properties of bronze powder.
Experimental
Bronze powder was procured from Alfa Aesar, USA. The bronze powder sample was divided into two parts, one part was considered as control and another part was subjected to Trivedi’s bio-field treatment, referred as treated. The control and treated samples were characterized using x-ray diffraction (XRD), particle size analyzer, scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy.
X-ray diffraction study
XRD analysiswas carried out on Phillips, Holland PW 1710 X-ray diffractometer system, which had a copper anode with nickel filter. The radiation of wavelength used by the XRD system was 1.54056 Å. The data obtained from this XRD were in the form of a chart of 2θ vs. intensity and a detailed table containing peak intensity counts, d value (Å), peak width (θ0), relative intensity (%) etc. Additionally, PowderX software was used to calculate lattice parameter and unit cell volume.
The crystallite size (G) was calculated by using formula:
image
Here, λ is the wavelength of radiation used and k is the equipment constant (=0.94). However, the percentage change in all parameters such as lattice parameter, unit cell volume and crystallite size was calculated using the following equation:
image
Where, ac and at are lattice parameter value of control and treated powder samples respectively
image
Where, Vc and Vt are the unit cell volume of control and treated powder samples respectively
image
Where, Gc and Gt are crystallite size of control and treated powder samples respectively. The XRD analysis carried was carried out on day 1, 10, 78, 106 and 117 day referred as control, T1, T2, T3, and T4 respectively.
Particle size analysis
For particle size analysis, laser particle size analyzer SYMPATEC HELOS-BF was used, which had a detection range of 0⋅1-875 μm. The particle size data was collected in the form of a chart of particle size vs. cumulative percentage. Three parameters of particle sizes viz. d50, d90, and d99 (size below which 50%, 90%, and 99% particles are present, respectively) were calculated from the particle size distribution curve. The percent change in particle sizes were calculated using following equation:
image
Where, (d50) Control and (d50) Treated are the particle size, d50 of control and treated samples respectively. Similarly, the percent change in particle size d90 and d99 were calculated. The particle size were evaluated on day 1, 12, 91, 97 and 115 for control, T1, T2, T3, and T4 respectively.
Scanning electron microscopy (SEM)
In order to study the changes in surface morphology of bronze powder after bio-field treatment, the control and treated sample were analyzed on day 20 using SEM, the JEOL JSM-6360 instrument.
FT-IR spectroscopy
To study the impact of bio-field treatment at atomic bonding level in bronze powder, the FT-IR analysis was done on Shimadzu, Fourier transform infrared (FT-IR) spectrometer with frequency range of 300- 4000 cm-1. FT-IR analysis was carried out on day 1, day 71 and day 82 for control, T1, and T2, respectively.
Results and Discussion
X-ray diffraction study
The XRD results are presented in Table 1. It was observed that the lattice parameter of the unit cell reduced by 0.2%, 0.26%, 0.19%, and 0.07% in treated bronze T1, T2, T3, and T4 respectively, as compared to control. The percent change in lattice parameter is also known as lattice strain. Further, the decreased lattice parameter led to reduce the volume of unit cell by 0.61%, 0.78%, 0.56%, and 0.21% in treated samples T1, T2, T3, and T4 respectively as compared to control (Figure 1). The percent change in lattice parameter and unit cell volume was found maximum on day 78 (T2). In general, when the applied stress is compressive the change in strain is negative while a positive value indicates a tensile stress. Thus, negative strain in all treated bronze sample indicated that a compressive stress was probably acted on treated bronze sample after bio-field treatment. It is possible that bio-field treatment could be transferred the energy to bronze powder and that may induced milling in the powder. Hence, this high energy milling may lead to persuade the compressive stress and changed the lattice parameter [16-19]. Moreover, the crystallite size was 88.96 nm in control sample, however it was changed to 148.96 nm, 111.30 nm, 44.52 nm, and 148.38 nm in treated samples on day 10 (T1), day 78 (T2), day 106 (T3), and day 117 (T4) respectively. The percent change in crystallite size is presented in Figure 2, it showed that the crystallite size was increased upto 66.79% on day 10, then started to decrease upto 49.96% on day 106 (T3) as compared to control. It is possible that the tin (Sn) atoms might be diffused into copper (Cu) due to biofield energy that may lead to coalescence of grains and increase the crystallite size [7]. Furthermore, the existence of severe lattice strains is evidenced by the change in lattice parameters (Figure 1). The presence of this internal strain may lead to fracture the grains into sub grains and decrease the crystallite size upto day 106 [19]. Moreover, the relation between strength of material and crystallite size is given by Hall-Patch equation as given below:
image
Where, σ is strength of the materialσ° , is a material constant for the starting stress for dislocation movement, k is the strengthening coefficient, G is crystallite size.
Dybiec et al. reported the material constant, ° =58.9 MPa and k=0.3689 MPa m1/2 for bronze [29]. These parameters were used to calculate the yield strength of control and treated bronze powder. The yield strength of all samples were calculated using equation (1) and percent change in treated bronze powder as compared to control. It was observed that the yield strength was reduced by 9% on day 10 (T1) and then increased upto 16.50% on day 106 (T3), as compared to control, after bio-field treatment. Nevertheless, the yield strength was again decreased by 8.99% on day 117 as compared to control. Overall, the graph indicates that bronze showed the higher yield strength in time period of day 82 to day 115 (Figure 3). This variation in yield strength in treated bronze powder could be due to change of crystallite size after bio-field treatment as explained by Hall and Petch. The strength of materials can be modulated by changing the crystallite size and this could be due to interactions of dislocations with crystallite boundaries as they move. In this phenomenon, the crystallites boundaries hindered the movement of dislocation gliding along the slip planes and increased the yield strength [30]. It is also reported that the reduction in crystallite size leads to increase the grain boundaries and vice versa. Thus, it is hypothesized that the change in crystallite size after bio-field treatment in bronze could alter the yield strength.
Particle size analysis
In order to understand the effect of bio-field treatment on particle size, several range i.e. d50, d90, andd99 were calculated and results are presented in Table 2 and Figure 4. It was observed that the particle sizes of d50, d90, andd99 were increased by 5.15, 8.21, 12.17% respectively, as compared to control on day 12. It may be due to agglomeration of finer particles through high energy milling that probably induced by bio-field treatment. Furthermore, the d50, d90, andd99 were reduced by 16.24, 18.71, 18.75% respectively, as compared to control on day 91.This can be possible if coarser particles get fracture to smaller particle size. Further, on day 97 the particle size of d50, d90, and d99 were reduced by 18.22, 12.89, and 11.95% respectively as compared to control. In addition, particle sizes of d50, d90, andd99 were also reduced by 13.47, 8.78, and 9.96% respectively on day 115, as compared to control. Overall, the graph showed that particle of each size i.e. finer to coarser, were reduced as increase in number of days after bio-field treatment (Figure 4). It is well known that the bronze powder particles are polycrystalline i.e. it consist of many grains. In polycrystalline particles, crystallite boundaries are the structural weak points [16,17]. Hence, it is hypothesized that these weak boundaries may fracture under stress and reduced particle size.
SEM analysis
The SEM images of control and treated bronze samples at magnification of 500x are shown in Figure 5. The diffusion welded and agglomerated particles were observed in control bronze with size range of 1-100 μm. However, in treated bronze powder, fractured surface morphology along with satellites and intra-particle boundaries were observed. Furthermore, the treated bronze particles were in the size range of 1-75 μm. It indicates that the coarser particles may fracture into finer after bio field treatment that possibly reduces the particle size [17]. Furthermore, in order to study the bronze powder at atomic bonding level, samples were analyzed using FT-IR.
FT-IR spectroscopy
FT-IR spectrum of control and treated bronze samples are shown in Figures 6-8. In all these spectra, absorption bands in region of range 4000-300 cm-1 were observed. The FT-IR spectra showed an absorption peak at wavenumber 1541 cm-1 (Control and T1) and 1550 cm-1 (T2), which characterized the O-H bending. However, the bands at wavenumber 3734 cm-1 (control and T1) and 3749 cm-1 (T2) were assigned to O-H stretching vibration that may be due to moisture absorption by samples [31,32]. Furthermore, the peak at 648 cm-1(control) and 650 cm-1 (T1), and 663 cm-1 (T2) can be attributed to Sn-O stretching vibrations [32]. This indicates that wavenumber shifted toward higher side, after bio-field treatment, which could be due to alteration in Sn-O bond strength. Besides this, the IR spectra of treated (T2) showed three new peaks at wavenumber 464 cm-1, 736 cm-1, and 835 cm-1 (Figure 8). The peaks at 736 cm-1, and 835 cm-1 can be attributed to Cu-O-H bending mode, whereas the emergence of peak at 464 cm-1 could be due to Cu-O vibrations [33,34]. Thus, it is presumed that bio-field treatment may be acting at atomic bonding level to cause these modifications.
Conclusion
In summary, the bio-field treatment has significantly altered the lattice strain, crystallite size, particle size and surface morphology in bronze powder as compared to control. XRD data revealed that the unit cell volume was reduced upto 0.78% as compared to control. This could be due to compressive stress generated during high energy milling through bio-field treatment. Besides this, the reduction in crystallite size upto 49.9% may lead to increase the mechanical strength of the bronze powder after bio-field treatment. In addition, bio-field treatment has significantly reduced the particle size upto 18.22% in bronze powder as compared to control. SEM data showed fractured surfaces in treated sample whereas welded particles were observed in control sample. Furthermore, the FT-IR analysis data suggest that there were three new peaks at 464 cm-1, 736 cm-1, and 835 cm-1 found in treated bronze as compared to control; indicated that there might be an alteration of bond properties in bronze after bio-field treatment. Overall, the biofield treatment has substantially altered the characteristics of bronze at physical and structural level. Thus, it is postulated that the biofield treated bronze powder could be more useful in bearing and gear applications in automobiles.
Acknowledgement
We thank Dr. Cheng Dong of NLSC, Institute of Physics, and Chinese academy of Sciences for supporting in using PowderX software for analyzing X-ray Diffraction data.
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