Synthesis of SiC/Si3N4 nanocomposite by using automotive waste tyres as resource

Rajarao, Ravindra; Farzana, Rifat; Khanna, Rita; Sahajwalla, Veena

doi:10.1016/j.jiec.2015.04.006

Cited by 16 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At 1200 °C the reaction between the silicon oxide, reducing gases and carbon residue from the degradation of organic components of ASR will lead to the reduction of SiO 2 . During the process of SiO 2 reduction, the presence of nitrogen from plastic leads to the formation of silicon nitride as indicated in the equations 1 and 22627. This enables the formation of silicon nitride (Si 3 N 4 ) on the surface of the steel.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing steel properties through in situ formation of ultrahard ceramic surface

Pahlevani

Kumar

Gorjizadeh

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

Abrasion and corrosion resistant steel has attracted considerable interest for industrial application as a means of minimising the costs associated with product/component failures and/or short replacement cycles. These classes of steels contain alloying elements that increase their resistance to abrasion and corrosion. Their benefits, however, currently come at a potentially prohibitive cost; such high performance steel products are both more technically challenging and more expensive to produce. Although these methods have proven effective in improving the performance of more expensive, high-grade steel components, they are not economically viable for relatively low cost steel products. New options are needed. In this study, a complex industrial waste stream has been transformed in situ via precisely controlled high temperature reactions to produce an ultrahard ceramic surface on steel. This innovative ultrahard ceramic surface increases both the hardness and compressive strength of the steel. Furthermore, by modifying the composition of the waste input and the processing parameters, the ceramic surface can be effectively customised to match the intended application of the steel. This economical new approach marries industry demands for more cost-effective, durable steel products with global imperatives to address resource depletion and environmental degradation through the recovery of resources from waste.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The configurations depict 6 supercells to show the relative position and distance of C and Al-O from the adjacent atoms. The figure was drawn using Vesta software26.…”

Section: Figurementioning

confidence: 99%

Enhancing steel properties through in situ formation of ultrahard ceramic surface

Pahlevani

Kumar

Gorjizadeh

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Also waste tire rubber and rubber ash contain nano-sized material and can influence environmental quality (Moghaddasi et al 2015). As a prospective approach to use automotive waste tyres as resources for synthesis of SiC/Si 3 N 4 nanocomposite has been reported by using simultaneous pyrolytic reduction and nitridation reaction using pyrolysed waste automotive tyre char as carbon source and silicon dioxide as silica source (Rajarao et al 2015). Such innovative approaches of using automotive tyres as carbon source for synthesising nanocomposites could be used to reduce the volume of wastes in landfills, decrease the risk of health concerns and also recover valuable carbon resources.…”

Section: Emerging Pollutants As Nano-scale Threat To the Environmentmentioning

confidence: 99%

Paradigms on landfill mining: From dump site scavenging to ecosystem services revitalization

Burlakovs

Kriipsalu

Kļaviņš

et al. 2017

Resources, Conservation and Recycling

View full text Add to dashboard Cite

For the next century to come, one of the biggest challenges is to provide the mankind with relevant and sufficient resources. The recovery of secondary resources plays a significant role. The industrial processes developed for regaining minerals for production of commodities in a circular economy become ever more important in the European Union and worldwide. Landfill mining (LFM) constitutes an important technological toolset of processes that regain the resources and redistribute them with an accompanying diminishment of hazardous influence of environmental contamination and other threats for human health hidden in former dump sites and landfills. 'Classical LFM' is a useful technology to discover hidden resources and look at the big picture of resources in the local, regional and global perspective. Therefore, this paper considers development of paradigms and attitudes to LFM as the technology for regaining calorific value; the furthering of deposited material valuable to more advanced concepts of enhanced LFM (ELFM); the recovery of landfill space and land value, and, finally, the possibility of full ecosystem services revitalization. The future of our civilisation depends on our wise use of commodities. Thus, waste operations beyond the Zero waste concept must be applied if mankind is to conquer space and the abyssal plains to conduct mining in the deepest oceans on the Earth. Other research areas feasible for LFM in terms of the environmental rehabilitation are given in the review. This compilation summarises the previous, current and future trends of LFM 2 technology regarding the paradigm developments that are influencing the attitude of scientists, industry and society to LFM as a complex tool for implementing the circular economy in practice. This review paper is based on a historical overview of global case studies and explores the methodology of waste management as regards the different tools for geochemical, geophysical and remote sensing that are used for field studies prior to the decisions whether LFM will be successful in an individual case. New technological developments of ELFM for the energy industry is described combined with a review of innovative material production. One chapter is dedicated to the Efficient Use of Resources and Optimal Production Economy (EUROPE) estimation model. The hazardous impacts of landfills, such as greenhouse gas emission and pollutants, are discussed. Throughout history, the major part of the 'LFM economy' has been viewed from a point of view of recovery of natural resources. Therefore, our main philosophy was to provide a historical experience linking with modern ideas of LFM to the increasingly relevant concept of a circular economy. The world is heading towards a restricted access to key resources. However, humanity should not limit itself to frame these restrictions but should also have a profound view on the global economy and life styles for future generations from an environmental and non-material resource standpoint. It is concluded that the big ...

show abstract

“…Increased scientific attention to ultra-fine grained ceramics has been derived by the promise of a reduction in flaw sizes, enhanced superplasticity, and the promise of improvement of a wide variety of other properties, as the grain size shrinks to nanometric dimensions [2][3][4]. Nano/micro and nanoceramics have some advantages, such as high-temperature strength and better creep resistance compared to monolithic ceramics [5][6][7][8][9]. Silicon carbide and silicon nitride have different mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of the in-Situ Si₃N₄-SiC Composite Nano Powders by Carbothermal Reduction

2017

View full text Add to dashboard Cite

Si3N4-SiC micro-nano composite powder has been studied by a group of authors during the last decade. Previous works have shown that SiC-Si3N4 ceramics exhibits good mechanical properties and high corrosion resistance at elevated temperatures. In this study, we have tried a new approach to obtaining SiC-Si3N4 ceramic composite powder by changing the conditions in the carbothermal reduction process. Starting powders were quartz mineral, received from Ege-Sil Co., as silicon-source and, carbon, as silica-reducing and carburizing agent. These powders were ground in the ring mill, separately and together. Carbothermal reduction-nitridation/carburization reactions were carried out in a tube furnace at > 1400• C for 4 hours under N2 and Ar gas, used as nitriding and shielding atmosphere. The synthesized powders were characterized by X-ray diffraction, SEM, and EDS. Results have shown that production of Si3N4-SiC micro-nano composite powder was achieved in the modified nitrogen and argon atmosphere above 1400• C. Determination of the Si3N4/SiC ratio was possible with sensitive control of the system conditions.

show abstract

Synthesis of SiC/Si3N4 nanocomposite by using automotive waste tyres as resource

Cited by 16 publications

References 17 publications

Enhancing steel properties through in situ formation of ultrahard ceramic surface

Enhancing steel properties through in situ formation of ultrahard ceramic surface

Paradigms on landfill mining: From dump site scavenging to ecosystem services revitalization

Synthesis of the in-Situ Si₃N₄-SiC Composite Nano Powders by Carbothermal Reduction

Contact Info

Product

Resources

About

Synthesis of SiC/Si3N4 nanocomposite by using automotive waste tyres as resource

Cited by 16 publications

References 17 publications

Enhancing steel properties through in situ formation of ultrahard ceramic surface

Enhancing steel properties through in situ formation of ultrahard ceramic surface

Paradigms on landfill mining: From dump site scavenging to ecosystem services revitalization

Synthesis of the in-Situ Si3N4-SiC Composite Nano Powders by Carbothermal Reduction

Contact Info

Product

Resources

About

Synthesis of the in-Situ Si₃N₄-SiC Composite Nano Powders by Carbothermal Reduction