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Processing and design methodologies for advanced and novel thermal barrier coatings for engineering applications

Particuology 2016年第4期14卷 1-28页

作者： Vijay Kumar balasubramanian kandasubramanian Department of Materials Engineering Defence Institute of Advanced Technology Girinagar Pune 411025 India

Thermal barrier coating is a crucial thermal insulation technology that enables the underlying substrate to operate near or above its melting temperature. Such coatings bolster engineers＇ perpetual desire to increase the power and efficiency of gas turbine engines through increasing the turbine inlet tempera- ture. Advances in recent years have made them suitable for wider engineering and defense applications, and hence they are currently attracting considerable attention. A thermal barrier coating system is itself dynamic; its components undergo recurrent changes in their composition, microstructure and crystalline phases during its service life. Nevertheless, the performance of multi-layered and multi-material sys- tems tailored for high temperature applications is closely linked to the deposition process. The process improvements achieved so far are the outcome of increased understanding of the relationship between the coating morphology and the operating service conditions, as well as developments in characterization techniques. This article presents a comprehensive review of various processing techniques and design methodologies for thermal barrier coatings. The emphasis of this review is on the particle technology; the interrelationship between particle preparation, modification and the resulting properties, to assist developments in advanced and novel thermal barrier coatings for engineering applications.

关键词： Thermal barrier coatingAir plasma sprayElectron beam-physical vapor depositionThermally grown oxideYttria-stabilized zirconiaThermal conductivity

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Electroless nickel fabrication on surface modified magnesium substrates

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Defence Technology（防务技术） 2019年第4期15卷 636-644页

作者： Ayushi Thakur Swaroop Gharde balasubramanian kandasubramanian Department of Metallurgical and Materials Engineering National Institute of Technology Hazratbal Srinagar Jammu & Kashmir 190006 India Department of Metallurgical & Materials Engineering DIAT (DU) Ministry of Defence Girinagar Pune 411025 Maharashtra India

In recent years,magnesium(Mg)has evolved as a salient material,in affiliation with electroless nickel(Ni)coating,which have found applications in automobiles,aerospace and confederate fields attributing to its excellent inherent weight sensitive ***,being acknowledged for its remarkable auxiliary properties like flexible machining,appreciable weight sensitivity and ability to be patently diecast into mesh constructs,magnesium is prejudiced by aeronautical standards predominantly for its inferior corrosion resistance *** this sense,electroless nickel plating on magnesium and its alloys has been suggested to extricate it from corrosion problem and make it more competitive in industrial and defence *** fixation of metal ions onto respective substrates accrues and alters their mechanical,electrochemical and tribological properties,destitute of any electric current *** proficiently identified technique is prosecuted with the assistance of a series of sequenced operations involving a prior pretreatment,which corresponds to the chemical cleaning of the substrate surface;electroless coating;and a later activation process which is a mild etching of the electroless coated *** susceptibility of magnesium to this methodology has advanced and propagated its exercise and applicability in aircraft,satellites and allied aeronautical ***,researchers have proposed various eco-friendly and modified duplex and composite coatings which have transmuted properties of these appendages by tailoring alloy compositions and reagents *** review article systematically colligates various considerations and evaluations on electroless nickel applications of magnesium and its alloys and explicates how it anchors its practice in the respective ***,a comprehensive analysis is devised based on the pre-existing treatment methods for accomplishing the same.

关键词： Electroless nickel plating Magnesium Magnesium alloys Corrosion-resistance Micro arc oxidation(MAO)

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Polymer composite for antistatic application in aerospace

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Defence Technology（防务技术） 2020年第1期16卷 107-118页

作者： Ramdayal Yadav Manoj Tirumali Xungai Wang Minoo Naebe balasubramanian kandasubramanian Institute for Frontier Materials Deakin UniversityWaurn PondsVIC3216Australia Department of Metallurgical and Materials Engineering Defence Institute of Advanced Technology(DU)GirinagarPune411025India

The pheno menon of static electricity is unpredictable,particulariy when an aircraft flying at high altitude that causes the accumulation of static charges beyond a threshold value leading to the failure of its parts and systems including severe explosion and radio communication *** accumulation of static charges on aircraft is generated by the virtue of interaction between the outer surface of aircraft and the external environmental attributes encompasses air particles,ice,hail,dust,volcanic ash in addition to its triboelectric *** the recent years,advanced polymer-based composites or nanocomposites are preferred structural constituents for aircrafts due to their light weight and comparable mechanical properties,but such composite systems do not render low impedance path for charge flow and are subsequently vulnerable to effect of lightning strike and precipitation *** this context,it is essential to develop conductive composite systems from non-co nductive polymer natrix by nano fillerembodime *** advent of carbon-based nanocomposite/nano materials have adequately addressed such issues related to the nonco nductive polymer matrix and further turned into an avant-garde genre of *** current review envisioned to illustrate the detailed exploitation of various polymer nanocomposites in addition to especially mentioned epoxy composites based on carbon fillers like carbon black,carbon nanotube(single walled carbon nanotube and multi walled carbon nanotube) and graphene the development of antistatic application in aircra ft in addition to the static charge phenomenon and condition for its prevalence in avionic systems.

关键词： Static discharge system Nanocomposite Anti-static materials Electromagnetic interference Aerospace applications

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Burning rate and other characteristics of strontium titanate （SrTiO3） supplemented AP/HTPB/Al composite propellants

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Defence Technology（防务技术） 2019年第3期15卷 313-318页

作者： Sunil Jain Garima Gupta Dhirendra R. Kshirsagar Vrushali H. Khire balasubramanian kandasubramanian HEMRL Sutarwadi Pune India a DIAT Girinagar Pune India

In a quest of search for a new burning rate modifier for composite propellant, strontium titanate (SrTiO3), a perovskite oxide has been chosen for evaluation in a composite propellant formulation based on its other catalytic applications. Initially, SrTiO3 was characterized for particle size, morphology and material/ phase identification (using XRD). By varying SrTiO3 content in a standard composite propellant, different compositions were prepared and their performance and processing parameters like the end of mix (EOM) viscosity, mechanical properties, density, burning rate, pressure exponent (n-value), etc. were measured. The results reveal that 2% SrTiO3 causes more than 12% enhancement in propellant burning rate (at 70 ksc pressure) in comparison to the standard propellant composition. The pressure exponent also increases to 0.46, whereas the standard composition was having its value as 0.35.

关键词： Strontium titanate Ammonium perchlorate Composite propellant Burning rate

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