Thāne, India
Thāne, India

Time filter

Source Type

Patnaik P.R.,Gharda Institute of Technology | Patnaik P.R.,Gharda Chemicals Ltd
Science and Engineering Ethics | Year: 2015

Along with economic strength, space technology and software expertise, India is also a leading nation in fraudulent scientific research. The problem is worsened by vested interests working in concert for their own benefits. These self-promoting cartels, together with biased evaluation methods and weak penal systems, combine to perpetuate scientific misconduct. Some of these issues are discussed in this commentary, with supporting examples and possible solutions. © 2015 Springer Science+Business Media Dordrecht


Puhan D.,Indian Institute of Technology Delhi | Puhan D.,Imperial College London | Bijwe J.,Indian Institute of Technology Delhi | Parida T.,Gharda Chemicals Ltd. | Trivedi P.,Gharda Chemicals Ltd.
Science of Advanced Materials | Year: 2015

Mechanical, thermal and tribological performance properties of poly-ether-ketone (PEK) are superior to those of poly-ether-ether ketone (PEEK) at elevated temperatures. Hexa boron nitride (hBN) is an excellent solid lubricant especially because of its high temperature stability. A series of eight composites based on PEK and short carbon fibers (CF) as reinforcement were developed using variable sizes of hBN as a solid lubricant to study the influence of size on improvement in tribo-properties of the composites. It was observed that the developed series of CF reinforced PEK composites led to very good tribo-performance (specific wear rate (K0) in the range of 10-16 m3/Nm and coefficient of friction (μ) in the range of 0.05-0.07 under high operating PV values 32-36 MPa m/s). The inclusion of hBN led to significant reduction (~50%) in μ at higher loads only at the cost of slight deterioration in wear resistance (WR). However, during long duration tests most of the composites, including that with nano-hBN, showed higher wear resistance and lower μ than that without hBN. Amongst the various sizes of selected particles of hBN, 0.5 μm size proved to be the most promising for achieving lowest μ. Based on worn surface analysis, it was concluded that the excessive breakage of fibers was the main reason for increased wear. As evident from SEM analysis of worn surfaces, it was primarily due to deterioration in fiber-matrix bonding due to hBN which is an inert (low surface energy) filler. © 2015 by American Scientific Publishers.


Bijwe J.,Indian Institute of Technology Delhi | Sharma S.,Indian Institute of Technology Delhi | Sharma M.,Indian Institute of Technology Delhi | Sharma M.,Leibniz Institute of Polymer Research | And 2 more authors.
Wear | Year: 2013

Polyetherketone (PEK) is one of the least explored specialty thermoplastic polymers for its tribo-utility. It exhibits continuous operating temperature up to 280°C and under short-term loads it can function up to 350°C. In literature, hardly anything is reported on the adhesive wear performance of PEK and its composites. Three composites based on PEK containing short fibers of carbon/glass along with various solid lubricants were developed and characterized for thermal and mechanical properties. The tribo-properties were studied under varying loads and speeds by sliding a composites pin against a mild steel disc as a counter face. The studies were focused to examine the role of these ingredients on enhancing pressure × velocity limit (PVlimit), which is an indication of utility of a tribo-polymer in severe operating conditions. The performance assessment was done according to multiple parameters; such as magnitude of coefficient of friction (μ) and its fluctuations with time, PVlimit, compatibility with the counter-face, specific wear rate (K0), etc. Very low K0 (≈10-16m3/Nm), very low μ (0.04-0.20) and very high PVlimit values (>95.2MPam/s) were reported for these composites. White graphite (hexa boron nitride-hBN) proved to be the most efficient solid lubricant. The wear mechanisms using scanning electron microscopy of worn surfaces of pins and discs were studied. It was interesting to observe that glass fibers in the composite showed extremely good performance instead of showing abrasion and high μ. A very different friction and wear mechanism was claimed to be responsible for this. A synergism between lubricating action of two lubricants and layer of molten glass on the disc was the main reason for the enhanced performance. © 2013 Elsevier B.V.


Trademark
Gharda Chemicals Ltd | Date: 2012-10-08

Herbicides, insecticides, pesticides and fungicides.


Trademark
Gharda Chemicals Ltd | Date: 2016-01-21

Herbicides, insecticides, pesticides and fungicides for domestic and agricultural use.


Trademark
Gharda Chemicals Ltd | Date: 2016-01-21

Herbicides, excluding aquatic herbicides, insecticides, pesticides, and fungicides, for use on residential and commercial building construction sites, excluding the construction of ponds and canals.


Trademark
Gharda Chemicals Ltd | Date: 2016-01-21

Herbicides, insecticides, pesticides and fungicides.


Trademark
GHARDA CHEMICALS Ltd | Date: 2012-07-16

herbicides, insecticides, pesticides and fungicides.


Trademark
Gharda Chemicals Ltd | Date: 2012-09-11

herbicides, pesticides and fungicides for domestic and agricultural use.


Trademark
Gharda Chemicals Ltd | Date: 2011-09-13

Herbicides, insecticides, pesticides and fungicides for domestic and agricultural use.

Loading Gharda Chemicals Ltd collaborators
Loading Gharda Chemicals Ltd collaborators