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将磨料浆体射流技术应用于切割领域,研制出相应的切割机床,避开了国外该项技术中的高压动密封问题,并对该机床的切割性能进行了正交试验,同时,将磨料浆体射流机床与前混合磨料水射流机床的切割性能进行了比较研究, 研究表明,影响磨料浆体射流切割性能的主要因素依次是切割速度、切割压力和靶距;在相同切割条件下,磨料浆体射流机床与前混合磨料水射流机床的切割力大致相同,但磨料浆体射流机床的切割质量明显好于后者,切割能耗大大低于后者。 相似文献
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磨料浆体射流系统特性的研究 总被引:2,自引:0,他引:2
论述了磨料浆体射流的基本特性,分析了磨料浓度、粒度等因素对浆体的流体力学特性的影响,提出了喷嘴设计的基本原则,根据冲击玻坏冲蚀机理,得出了系统工作的最优参数。 相似文献
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分析了磨料浆体射流技术的特点及需求领域。将磨料浆体射流技术应用于切割领域,研制出相应的切割机床,进行了切割原理、数控部分及CAD部分的设计,并对磨料浆体射流切割机床的切割性能进行了试验研究。 相似文献
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提出了在低压下应用磨料浆体射流技术的切割系统,该系统采用了新型的添加剂材料配制浆料,经试验分析,可取代高聚物类添加剂。系统采用一种特殊的高压料罐来传递压力,使浆料与高压传递介质互不掺混,各自独立循环使用。试验研究了低压磨料浆体射流切割不同材料时切割速度与切割深度的关系,对比了不同直径喷嘴的切割能力。对切割比能耗进行了计算与分析,结果显示在同等切割能力下,该种切割技术比能耗小,切割成本低,切割质量好,且使用小直径喷嘴,优势更为明显。 相似文献
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浆体管道的阻力特性及其影响因素分析 总被引:11,自引:0,他引:11
探讨了浆体管道阻力特性的变化规律及损失机理,并就其主要影响因素,如物料特性、浆体特性和管道特性等进行了分析,从而为浆体管道的工程设计提供合理的依据。 相似文献
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金属陶瓷覆层材料坯体的料浆法成形工艺 总被引:10,自引:1,他引:10
以无水乙醇和丁酮的共沸体系为溶剂,三油酸甘油酸为分散剂,PVB为粘结剂,丙三醇和DOP为增塑剂,环己酮为均化剂,将Fe-6B-48Mo混合粉末制备成为均匀分散、稳定悬浮的料浆。利用此料浆,通过三种方法成形了覆层材料的坯体:用流延成形法制备出颗粒分布均匀、结构致密、厚度可控、具有适宜柔韧性和拉伸强度的覆层薄片坯体,根据覆层厚度要求可将一层或多层坯体叠置在钢基体上烧结;用雾化喷涂法或涂刷法直接在钢材或工件表面上形成厚度均匀、结构致密、粘结牢固的覆层坯体。对覆层坯体成形工艺中的干燥技术、坯体厚度控制技术等进行了研究。 相似文献
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为了配制适用于JGS1光学石英玻璃超声波精细雾化抛光的特种抛光液,以材料去除率和表面粗糙度为评价指标,设计正交试验探究抛光液中各组分含量对雾化抛光效果的影响,并对材料去除机制进行简要分析。结果表明:各因素对材料去除率的影响程度由大到小分别为SiO2、pH值、络合剂、助溶剂和表面活性剂,对表面粗糙度影响程度的顺序为SiO2、表面活性剂、pH值、助溶剂和络合剂;当磨料SiO2质量分数为19%,络合剂柠檬酸质量分数为1.4%,助溶剂碳酸胍质量分数为0.2%,表面活性剂聚乙烯吡咯烷酮质量分数为0.9%,pH值为11时,雾化抛光效果最好,材料去除率为169.5 nm/min,表面粗糙度为0.73 nm;去除过程中石英玻璃在碱性环境下与抛光液发生化学反应,生成低于本体硬度的软质层,易于通过磨粒机械作用去除。使用该抛光液进行传统化学机械抛光和雾化化学机械抛光,比较两者的抛光效果。结果表明:两者抛光效果接近,但超声雾化方式抛光液用量少,仅为传统抛光方式的1/7。 相似文献
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分散剂对铜CMP材料去除率和表面粗糙度影响的实验研究 总被引:2,自引:0,他引:2
使用5种分散剂,SiO2水溶胶为磨料、H2O2为氧化剂,分别进行抛光实验。结果表明:二乙烯三胺和吡啶2种分散剂相对较好,二乙烯三胺(质量分数0.05%)对铜的材料去除率达到570.20nm/min,表面粗糙度为Rα1.0760nm,吡啶(质量分数0.75%)的材料去除率为373.69nm/min,表面粗糙度为Rα1.5776nm;二乙烯三胺提高了抛光液的碱性并增强了对铜金属的腐蚀作用是材料去除率提高的主要原因,其多胺基的极性吸附和与胶体分子羟基的化学键作用提高了抛光液磨粒胶体表面的zeta电位,较大的分子链有效地提高了磨料粒子间的空间排斥力,故较好的纳米磨料粒子分散性使抛光表面粗糙度降低。 相似文献
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为提高铜纳米颗粒在润滑油中的分散性能,以苯并三氮唑和卤代烃为原料,合成烷基苯并三氮唑分散剂,并通过红外光谱和核磁共振确定化合物的结构;通过沉降试验、流变性能的测试考察了分散剂的烷基链长、分散剂的用量对分散性能的影响,并通过热分析和TEM对分散剂的分散性能做进一步考察。结果表明:分散剂的链长为十八时,分散剂质量分数为0.1%-0.2%时分散剂的分散性能最好;并且分散剂的质量分数小于0.2%时对润滑油流变性能的影响很小;分散剂与纳米铜的结合不仅有物理吸附还有化学吸附。在四球摩擦磨损试验机上进行的摩擦学性能试验结果表明,采用所合成的分散剂分散的铜纳米微粒添加剂能够显著提高基础油的极压性能,同时具有良好的减摩性能。 相似文献
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磨削区磨料流体动压力仿真研究 总被引:2,自引:0,他引:2
根据Navier-Stokes方程和流体流动的连续性方程,建立了砂轮约束磨粒喷射精密光整加工中砂轮/工件楔形接触区磨料流体动压力的数学模型;进行了砂轮速度、砂轮/工件平均最小间隙以及砂轮直径对楔形区磨料流体动压力影响的仿真研究。结果表明,流体动压力随砂轮速度的提高和平均最小间隙的降低而增加,最大压力峰值发生在砂轮与工件平均最小间隙区域,且在该区域压力梯度变化明显;除了在砂轮宽度边缘产生侧泄外,在砂轮宽度方向流体动压力分布规律相同;随着砂轮与工件之间平均最小间隙的减小,动压力峰值区域曲线变窄,砂轮直径对流体动压力影响不明显。 相似文献
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为提高铜互连化学机械抛光(CMP)后表面质量,在抛光液中需引入适当的表面活性剂以改善磨料的稳定性以及CMP后铜的表面粗糙度。研究了十二烷基硫酸铵(ADSA)、脂肪醇聚氧乙烯醚硫酸铵(AESA)、直链烷基苯磺酸(LABSA)3种不同阴离子表面活性剂,以及非离子表面活性剂脂肪醇聚氧乙烯醚(AEO-9)和LABSA复配表面活性剂对钽阻挡层抛光液润湿性、分散性以及对材料去除速率的影响。通过接触角测量仪、纳米粒度仪、扫描电镜和原子力显微镜测试表面张力、接触角、大颗粒数、粒径分布以及CMP后铜的表面粗糙度,并分析复配表面活性剂的作用机制。结果表明:抛光液中加入LABSA后,因其具有直链型结构,抛光液的润湿性和分散性效果最好,抛光后铜表面的粗糙度最低;AEO-9和LABSA进行复配,相较于单一的LABSA,抛光液的润湿性、分散性、稳定性和抛光后铜表面粗糙度均有所改善,体积分数0.1%LABSA+0.1%AEO-9的复配表面活性剂性能最优,CMP后铜表面粗糙度降至0.7 nm。 相似文献
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光助芬顿反应对6H-SiC化学机械抛光的影响 总被引:1,自引:0,他引:1
为提高6H-SiC晶片化学机械抛光的材料去除率(MRR)并改善其表面质量,采用光助芬顿反应体系对6H-SiC晶片进行化学机械抛光,研究紫外光功率、抛光液pH值、H2O2质量分数和Fe2+浓度对6H-SiC晶片抛光效果的影响。使用原子力显微镜观察6H-SiC晶片表面质量,采用纳米粒度电位仪测量抛光液中SiO2磨粒的粒径分布及Zeta电位,利用可见分光光度法检测溶液中羟基自由基(·OH)的浓度并通过紫外-可见光谱分析紫外光的作用机制。结果表明:引入紫外光提高了6H-SiC的MRR,增大紫外光功率,MRR也随之增加;随pH值、H2O2质量分数和Fe2+浓度的升高,MRR先增大后减小;pH值影响磨粒间的静电排斥力及磨粒的分散稳定性,从而影响6H-SiC的MRR;与采用芬顿反应体系的抛光液相比,采用光助芬顿反应体系的抛光液中产生的·OH数量较多,说明紫外光能够增加反应体系中·OH的数量,从而促进6H-SiC晶片的表面氧化,提高6H-SiC晶片的MRR,并改善其表面质量。 相似文献
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Cong Mao Hongfu Zou Xin Zhou Yong Huang Hangyu Gan Zhixiong Zhou 《The International Journal of Advanced Manufacturing Technology》2014,71(9-12):2073-2081
The nanofluid is usually applied in minimum quantity lubricant (MQL) grinding to decrease grinding temperature and to improve surface integrity of workpiece. However, a large challenge in the application process of nanofluid is the sedimentation of the nanoparticles due to their poor suspension stability in the base fluid. Then, the lubrication and heat conduction characteristics of nanofluid will be deteriorated, and the nanofluid cannot be atomized as expected during grinding. Therefore, the heat transfer performance of nanofluid during MQL grinding severely decreased. In this study, the force state of nanoparticle in base fluid was analyzed and the effect of dispersant on the force state of nanoparticle was researched. The suspension stability of Al2O3 (0.5 wt.%) nanofluid was investigated under different ultrasonic vibration times, pH values, and dispersant concentrations (sodium dodecyl benzene sulfonate, SDBS). It is found that the suspension stability of nanofluid is quite poor under short-time ultrasonic vibration condition, and the nanofluid with good suspension stability can be obtained when the ultrasonic vibration time exceeds 0.5 h. A higher concentration of SDBS will lead to a better suspension stability of nanofluid when the concentration of SDBS is quite low. However, if the concentration of SDBS exceeds 0.5 wt.%, there is oversaturated adsorption on the nanoparticles surface which results in the deterioration of suspension stability of nanofluid with the increase of the SDBS concentration. As pH value is below 7, the suspension stability of nanofluid is significantly improved with the increase of pH value. The sedimentation clearly appeared in the disperse system when pH value is higher than 7. The dispersion morphology of the Al2O3 nanoparticles in disperse system is analyzed by using a scanning electron microscope. It is found that some large aggregates appeared when no dispersant was applied in the disperse system, and the Al2O3 nanoparticles are uniformly dispersed in disperse system with the application of the dispersant. 相似文献
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Electrochemical slurry jet micro-machining (ESJM) is a new non-conventional process that couples abrasive slurry jet machining (ASJM) and electrochemical jet machining (ECJM) concurrently. A micro-jet of abrasive particles and electrolytic solution is made to impinge on the target while applying a DC potential between the jet nozzle and the workpiece. ESJM can be used to remove material that is difficult to machine through a combination of erosion, corrosion and synergistic effects. This study focuses on ESJM of tungsten carbide (WC) using a pH-neutral NaCl electrolyte rather than an alkaline solution which is more commonly used in the electrochemical processing of WC. For the studied process parameters, it was shown that the erosion due to ASJM alone was not able to erode the WC, and that the corrosion under ECJM was slow and produced unacceptably wide channels. The combined ESJM process however, was found to involve erosion of the developed oxide layer and subsequent exposure of un-corroded WC, leading to a much higher machining current density, corrosion rate, and machining localization than using ECJM alone. It was also found that the total abrasive kinetic energy, working voltage and solution concentration strongly affected the machining current density, material removal rate and aspect ratio (depth to width ratio). The results indicate that ESJM has a high potential to machine difficult-to-cut metals efficiently and economically. 相似文献