tailieunhanh - Báo cáo hóa học: " Flame synthesis of carbon nanostructures on Ni-plated hardmetal substrates"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Flame synthesis of carbon nanostructures on Ni-plated hardmetal substrates | Zhu et al. Nanoscale Research Letters 2011 6 331 http content 6 1 331 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Flame synthesis of carbon nanostructures on Ni-plated hardmetal substrates 1 2 2 2 J 1-3 3 Hongmei Zhu Tongchun Kuang Bin Zhu Shumei Lei Zongwen Liu and Simon Peter Ringer Abstract In this article we demonstrate that carbon nanostructures could be synthesized on the Ni-plated YG6 WC-6 wt Co hardmetal substrate by a simple ethanol diffusion flame method. The morphologies and microstructures of the Ni-plated layer and the carbon nanostructures were examined by various techniques including scanning electron microscopy X-ray diffraction and Raman spectroscopy. The growth mechanism of such carbon nanostructures is discussed. This work may provide a strategy to improve the performance of hardmetal products and thus to widen their potential applications. Background Hardmetals are widely used for cutting tools and as wear resistant components 1 . In order to improve the performance and the durability of the hardmetals the application of coating is necessary. Carbon nanostructures such as nanocrystalline diamond carbon nanofibers CNFs and carbon nanotubes CNTs are considered as the ideal coating or reinforcing candidates for the hardmetals due to their extraordinary mechanical chemical thermal and electronic properties 2-4 . However a poor adhesion of the coating on the hardmetal substrate is still the main limitation to the wide applications. Many efforts have been made to improve the adhesion between the c o ating and the hardmetal substrate the introduction of an interlayer was demonstrated as one of the most effective approaches to achieve this 5 6 . Here we chose metal Ni as an interlayer considering its several inherent advantages 7-10 1 the linear expansion coefficient of Ni is very close to that of the hardmetal substrate 2 Ni possesses favorable wettability with carbon nanostructures and thus .