Plasma Sprayed Red Mud-Fly Ash Composite Coatings on Mild Steel: A Comprehensive Outline | Chapter 13 | Advances and Trends in Physical Science Research Vol. 2
The present
investigation aims at evaluating the effect of fly ash addition on coating
characteristics of pure red mud. Plasma sprayed coatings composed of red mud
and a varying percentage of fly ash on mild steel were considered for the
study. Coating technologies have already gained a promising momentum for the
creation of emerging materials in the last few decades. Plasma spraying
technique was used with varying levels of power namely 6, 9, 12 and 15 kW.
Plasma spray is one of the most widely used techniques involved in surface
modification by improvement of wear resistance, which may affirm the great
versatility and its application to a wide spectrum of materials. Investigations
of the coatings focused on tribological properties like sliding wear behaviour,
wear morphology, wear mechanism and frictional force. Different coating
characteristics like surface morphology, hardness, porosity, thickness and new
phase formation are studied. The sustainability of these coatings towards high
temperature at air environment up to 1000°C is evaluated by finding their
adhesion strength. DSC and TGA
techniques are implemented to observe the coating behaviour to heat. The
coatings show remarkable resistance towards high temperature by virtue of
adhesion strength compensation. It is feasible to use these coatings limiting
< 800°C otherwise dislodging of coating from metal. Fly ash with 10, 20 and
50% by weight was mixed with red mud and sliding wear test performed using a
pin on disc wear test machine. The wear test was performed for sliding distance
up to 942 m with track diameter of 100 mm and at a sliding speed of 100 rpm
(0.523 m/s); applying a normal load of 10 N for a maximum duration of 30
minutes. The variation of wear rate and frictional force with that of sliding
distance and time has been presented. The addition of fly ash with red mud
reduces the wear rate by enhancing the coating property. But the optimum
percentages of fly ash required for better coating material still impact a
question mark for the researchers. It is observed that for the early stage the
wear rate increases slowly and then rises drastically with sliding distance for
all coating type and finally becomes stagnant. Operating power level proved to
be the remarkable variable for different coating property. In our observation
the coatings wear resistance (reverse of wear rate) decreases until an optimum
value at 12 kW, afterwards indicating some other dominating parameters.
Significant wear resistance was visible with the addition of fly ash due to an
increase in bond strength and dense film at the interface. Wear rate decreases
with operating power up to 12 kW, thereafter increases with initiating other
dominating parameters. The present study concludes that, red mud coatings
possess acceptable thermal properties. Fly ash is a beneficiary reinforcing
agent for red mud, and the composite can be coat able with favoring surface
properties. These coatings can be operated at high temperature. It is observed
that, these composite coatings can also be employed for suitable trbological
applications. Plasma generating power, adversely affect the coating morphology.
Our work is a portfolio for researcher to discover many other aspects of red
mud and its composite coatings. Study of corrosion wear behaviour may be
implemented by future investigators to find its distinct application areas.
Biography
of author(s)
Harekrushna Sutar
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India and Department of Chemical Engineering, Jadavpur University, Kolkata, India and Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India.
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India and Department of Chemical Engineering, Jadavpur University, Kolkata, India and Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India.
Rabiranjan Murmu
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India.
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India.
Debashis
Roy
Department of Chemical Engineering, Jadavpur University, Kolkata, India.
Department of Chemical Engineering, Jadavpur University, Kolkata, India.
Subash
Chandra Mishra
Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India.
Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India.
Read full article: http://bp.bookpi.org/index.php/bpi/catalog/view/25/71/163-1
View Volume: https://doi.org/10.9734/bpi/atpsr/v2
Comments
Post a Comment