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本文对机械力化学在工程中的应用研究方面进行综述,讨论了粉碎过程的机械力化学效应,提出了完善这些工艺和创建新工艺、发展新品种的主要途径. 相似文献
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对坡缕石进行提纯,采用高能球磨法对其进行铜改性,并对其机械力化学效应进行了研究;比表面积、XRD和TG测试分析结果表明:机械力化学法可以较大程度地提高坡缕石粘土矿物的表面活性,同时,铜离子可以进入到坡缕石的表面晶格结构中,但坡缕石原有的晶体结构没有发生根本改变。 相似文献
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机械力化学效应对硅灰石超细粉物性影响的研究 总被引:9,自引:5,他引:4
以硅灰石矿物粉末作为对象,研究了硅灰石在微粉碎过程中,粉体粒度(激光衍射法)、比表面积(BET吸附法)、结晶构造畸变(有效Debye-Waller参数D)的变化特征,并通过XRD检测证实硅灰石从三斜晶系向单斜晶系转变过程,从而清晰地说明在超细粉磨过程中机械力化学效应的存在及对硅灰石超细粉物性的影响。 相似文献
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陶瓷及其复合材料合成的机械力化学效应 总被引:2,自引:0,他引:2
介绍了陶瓷及其复合材料(如:氧化物陶瓷、生物陶瓷、电子陶瓷、微波绝缘复合陶瓷、电池材料和sialon陶瓷复合材料)合成的机械力化学效应研究的进展。软机械力化学合成方法的生产成本低,将该方法用于工业化生产各种陶瓷材料具有相当大的应用前景。通过选择合适的原料和研磨条件,机械力化学合成的方法可用于制备很多高性能无机材料。用机械力化学合成的方法可加速并简化合成反应,减少能量和原材料的消耗,即经济又环保。同时,机械力化学合成的方法可以通过非常规的途径使纳米结构陶瓷材料晶化反应快速进行。针对此研究领域将来的发展方向提出了建议。 相似文献
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研究结果表明:在石灰石和石英粒度级相同的情况下,石英与不同研磨时间的石灰石作用时,对生成C2S的影响是石灰石研磨时间越长,对生成C2S越有利,但影响甚微.在石灰石和石英粒度级相同的情况下,石灰石与不同研磨时间的石英作用时,对生成C2S的影响是石英研磨时间越长,对生成C2S越有利,此效应比增加石灰石研磨时间对生成C2S的效应大很多.在石灰石和石英研磨时间均相同的情况下,不同粒度的石灰石和不同粒度的石英作用时,石英分散度的增大较石灰石分散度的增大对生成C2S更为有利. 相似文献
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R.F. Louh C.K. Lin Oscar Lin G.S.Chen C.C. Chan 《过程工程学报》2004,4(Z1):424-430
The solid state synthesis can be carried out by using the initial pure metal zinc and inorganic sulfur powder mixtures by means of the mechanochemical synthesis route. The completion of solid state reaction between pure zinc and sulfur powder to produce c-ZnS and h-ZnS phases via such a route was rather fast, as compared to other non-sulfide systems by the similar method. The study was aimed to investigate the microstructure development and phase formation through the solid state reaction by controlling the processing parameters involved in this process including grinding media to powder weight ratio, solid state reaction duration, reaction atmosphere, stoichiometric ratio of zinc and sulfur elements, grinding media and choice of minor additives such as teflon-based polymeric lubricants and transition metal dopants (Mn, Cu). Both as-synthesized powders and heat-treated ZnS materials with various stoichiometric ratios were characterized by XRD, EXAFS and XANES analysis. The interesting results from X-ray absorption spectroscopy (XAS) would provide us some strong evidence whether stoichiometric and non-stoichiometric ZnS material can be successfully formed. The minor amount (0.5wt%)of Mn+2 or Cu+2 ion dopants added to the powder batch with the Zn/S stoichiometric ratio between1.00 to 1.05 was found to favor the reaction rate in the mechanochemical synthesis. Moreover, the obtained results of ZnS phase development under reaction conditions and different transition metal dopants in this study would imply that synthesis of other kind of sulfide compounds can be achieved using the demonstrated technique. 相似文献
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在纤维素分解酶或碱存在下,用星形粉碎机处理高位苔藓泥炭,研究了该机械化学作用对泥炭中水可溶多糖级分组成的影响。由于机械化学转化,导致多糖的产率、多分散性、分子量和光密度发生了变化。机械化学处理对泥炭水溶级分中的单糖组成也有影响。 相似文献
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我国超细粉碎与超细分级技术的现状及问题 总被引:5,自引:0,他引:5
孙成林 《硫磷设计与粉体工程》2002,(6):4-10
近年来 ,我国的超细粉碎与超细分级技术有很大的发展 ,但在发展过程中存在着一些问题。超细粉体涉及的行业众多 ,但对其粒度的分类至今国内尚无定论。通过调研 ,分析了目前国内超细粉碎设备的现状。对超细粉体分级技术中的干法分级和湿法分级作了比较全面的介绍 ,并对我国超细粉碎与超细分级技术的发展提出了建议 相似文献
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延年素纤维是利用生态、环保、健康的天然原材料开发出的一种比较新型的含负离子的功能性合成纤维。概述了延年素纤维在国内外的发展概况,介绍了延年素纤维的有效成分——电气石,延年素纤维制作工艺流程,纤维的压电效应、热电效应、释放负离子功能、发射红外线功能、释放微量元素功能、抗菌功能等的产生机理及其在服装、床上用品、医疗领域、汽车内饰、功能性服装等领域的应用,并且预测了延年素纤维的发展前景。 相似文献
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Ying Zhu Ying Dong Xiwen Qian Fengjie Cui Qin Guo Xinghua Zhou Yun Wang Yi Zhang Zhiyu Xiong 《International journal of molecular sciences》2012,13(11):14203-14218
The antidiabetic activities of bitter melon powders produced with lyophilization/superfine grinding and hot air drying/normal grinding were investigated in vivo for selecting a suitable bitter melon processing procedure. After a five-week treatment, bitter melon lyophilized superfine grinding powder (BLSP) had a higher antidiabetic activity with reducing fasting blood glucose levels from 21.40 to 12.54 mmol/L, the serum insulin levels from 40.93 to 30.74 mIU/L, and restoring activities of SOD compared with those in the bitter melon hot air drying powder (BAP) treated group. Furthermore, BLSP protected pancreatic tissues including islet beta cells and reduced the loss of islet cells. Combined with the difference of compositions in BLSP and BAP, it could be concluded that superfine grinding and lyophilization processes were beneficial for presenting the antidiabetic activity, which will provide a reference for direct utilization of bitter melon as a suitable functional food to relieve symptoms of diabetes. 相似文献
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Ying Long Zong Wu Xin Zheng Hua-Tay Lin Fenglin Zhang 《Journal of the American Ceramic Society》2020,103(2):831-838
Tungsten diboride and tetra-boride were synthesized by a combination of mechanochemical method and the subsequent heat treatment. To clarify the formation process of tungsten diboride (WB2) and tetra-boride (WB4) using W-B mixture system with variable B concentration, the effects of ball-to-powder ratio, W to B molar ratio on mechanochemical process were studied, and the relationship between phase composition and annealing temperature was built. The results show that, the synthesis of WB2 with W:B = 1:5 can be improved by increasing ball-to-powder ratio from 4:1 to 6:1, but no WB4 phase can be directly synthesized by mechanochemical method. WB2 (AlB2-WB2, P6/mmm) phase can be only synthesized with W to B molar ratio of 1:4 and 1:5. Further increase in B content to W:B = 1:6 or less, W was present as the main phase with high crystallinity (>71%). WB4 phase was formed as an annealing temperature as low as 1000°C, which was not stable and may decompose to WB2 (WB2-WB2, P6/mmm) phase with the increase in temperature. The decomposition temperature of WB4 can be improved by increasing the B content. Compared with the W-B mixtures (W:B = 1:12) being milled for 1 hour, the powders milled for 40 hours present 20% higher of WB4 weight fraction after being annealed at 1400°C for 2 hours. 相似文献