Doddapaneni V Vinay K, Lee Kijoon, Colbert Tyler T, Mirzababaei Saereh, Paul Brian K, Pasebani Somayeh, Chang Chih-Hung
School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA.
School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA.
Nanomaterials (Basel). 2021 Sep 5;11(9):2304. doi: 10.3390/nano11092304.
This paper studied the feasibility of a new solution-processed method to manufacture black tungsten nanostructures by laser conversion of tungsten hexacarbonyl precursor on the Inconel 625 substrate under argon atmosphere at ambient pressure. The results show that sublimation of the precursor can be prevented if the decomposition temperature (>170 °C) is achieved using the laser heating method. Three different laser powers from 60-400 W were used to investigate the role of laser parameters on the conversion. It was found that lower laser power of 60 W resulted in a mixture of unconverted precursor and converted tungsten. Higher laser powers >200 W resulted in α-W (BCC) in one step without further heat treatment. Different oxygen concentrations from 0.5 ppm to 21 vol% were used in the laser canister to investigate the effect of oxygen concentration on the conversion. It was found that the hard vacuum (>10 torr) or hydrogen is not necessary to obtain α-W (BCC). The solar absorptance varied from 63-97%, depending on the amount of precursor deposited on the substrate and oxygen content in the laser canister. This solution-based laser conversion of tungsten precursor is a scalable method to manufacture tungsten coatings for high-temperature applications.
本文研究了一种新的溶液处理方法的可行性，该方法是在常压氩气气氛下，通过激光将六羰基钨前驱体在因科镍合金625基底上进行转化来制备黑色钨纳米结构。结果表明，如果使用激光加热方法达到分解温度（>170°C），则可以防止前驱体升华。使用60 - 400 W的三种不同激光功率来研究激光参数对转化的作用。发现60 W的较低激光功率会导致未转化的前驱体和转化后的钨的混合物。大于200 W的较高激光功率一步就能得到α-W（体心立方），无需进一步热处理。在激光罐中使用0.5 ppm至21 vol%的不同氧气浓度来研究氧气浓度对转化的影响。发现获得α-W（体心立方）并不需要高真空（>10托）或氢气。太阳能吸收率在63% - 97%之间变化，这取决于沉积在基底上的前驱体的量以及激光罐中的氧气含量。这种基于溶液的钨前驱体激光转化是一种可扩展的方法，用于制造高温应用的钨涂层。
