Background:
Conventional glass ionomer cement (CGIC) has many beneficial properties, but it has poor physical and mechanical properties. Therefore, new glass ionomer cement (GIC) is manufactured by adding zinc to improve the mechanical properties of GIC ChemFil Rock. This material possesses better flexural tensile strength and compressive strength in comparison to conventional to CGIC.
Objectives:
The aim of this study was to compare four properties of ZRGI like fracture toughness, surface micro-hardness, abrasive wear, and roughness to other GIC material, which are commercially available as: resin-coated glass ionomer (EQUIA FIL).
Materials and Methods:
The study was done in dual phase. In phase-1, micro-hardness surface roughness, abrasion of four GIC and a composite resin as control was analyzed and in phase-2, fracture toughness of four GIC was done at 24 h interval so that all cement achieve its peak strength.
Results:
Micro-hardness value of ChemFil Rock was lowest among different GIC groups. All four GIC group exhibit similar abrasion capacities, while composite were more wear-resistant significantly. Roughness change was highest on ChemFil Rock compared to other GIC. EQUIA FIL has the highest fracture toughness, followed by ChemFil Rock.
Conclusion:
We can conclude that incorporating zinc in the matrix of chemfil rock increases fracture toughness and good abrasive wear, but it does not improve micro-hardness or surface roughness.
Turning of hardened steel is normally carried out with copious supply of cutting fluid to improve the cutting performance. Most of the cutting fluids in regular use are petroleum based emulsions which create several environmental problems. In this context, pure dry turning is a logical alternative as it is free from the problems associated with the cutting fluid. The achievable tool life and part finish are often affected while machining under completely dry condition. Under such situation, the concept of minimal cutting fluid application (MCFA) presents itself as a possible solution. In this study an effort was made to study the effect of soya bean oil based cutting fluid on cutting performance with minimal cutting fluid application during turning of hardened AISI4340 steel. An 18 run experiment was designed using Taguchi technique to study the effect of fluid application parameters on cutting temperature and surface roughness. Improvement in cutting performance was observed in terms of reduction in cutting temperature and improvement in surface finish (Ra) when water in oil emulsion of soya bean oil was used as the cutting fluid.
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