Fe—RE稀土中间合金对TiC钢结硬质合金影响的研究

研究了Fe—RE中间合金的添加对TiC钢结硬质合金力学性能、显微组织的影响及其作用机理．结果表明,Fe—RE稀土中间合金可以减小液态铁表面张力、改善液相流动性与润湿性、细化晶粒、有效减小孔隙度从而获得高密度和较高硬度的TiC钢结硬质合金材料．     

稀土在盐浴渗碳中的应用

本文研究了稀土在盐浴液体渗碳中的作用,试验表明加入稀土后,可使渗碳速度加快,渗层厚度增加,渗后淬火硬度提高,使零件达到≥HR15N89的技术要求。可取代剧毒的氰盐和微毒的“603”盐浴渗碳。     

基于多粒度和语义信息的中文关系抽取

中文关系抽取采用基于字符或基于词的神经网络,现有的方法大多存在分词错误和歧义现象,会不可避免的引入大量冗余和噪音,从而影响关系抽取的结果.为了解决这一问题,本文提出了一种基于多粒度并结合语义信息的中文关系抽取模型.在该模型中,我们将词级别的信息合并进入字符级别的信息中,从而避免句子分割时产生错误;借助外部的语义信息对多义词进行建模,来减轻多义词所产生的歧义现象;并且采用字符级别和句子级别的双重注意力机制.实验表明,本文提出的模型能够有效提高中文关系抽取的准确率和召回率,与其他基线模型相比,具有更好的优越性和可解释性.     

骨骼实体模型的快速制作

介绍了应用逆向工程技术,对人体骨骼实体进行激光三维数据采集,在此基础上采用三维CAD/CAM进行了骨骼模型的三维造型,并最终采用快速原型制造技术制造出该骨骼实体模型.     

基于技术的医学内植物制造

利用目标组织的医学CT或MRI等测量数据，通过反求软件对数据进行反求、重构获得所需医学内植物的三维数据模型，由快速成形技术完成临床产品制造，是具有复杂形状医学内植物产品较为理想的制造方法。这里通过对两种内植物产品制造工艺的具体分析，阐述了这一先进制造技术在生物医学工程中的研究和应用。     

飞机结构件数控加工工艺知识组织与管理

介绍飞机结构件数控加工工艺决策专家系统中，工艺决策知识的组织与管理的思想和方法，并讨论了知识库的一致性维护问题。     

基于工业设计和先进制造技术的产品快速开发

提出一种将工业设计与逆向工程（RE）、CAX技术、快速成型和快速模具结合起来的集成开发模式。在该模式下,利用RE技术直接将工业设计获得的实物模型转换为数据模型。数据模型在CAD系统中进行处理,构造曲面模型或STL模型表面、再经过STL模型表面的偏置处理,利用RP和RT技术直接、快速的制作出样件或小批量成品,利用CAM系统还可以输出机械加工需要的数据代码。本文洋细介绍了该模式的组成部分、工作流程以及接口等关键技术,并以一个实例来说明该模式的正确性和高效性。     

Influence of rare earth nanoparticles and inoculants on performance and microstructure of high chromium cast iron

The high chromium cast irons (HCCIs) with rare earth (RE) nanoparticles or inoculants were fabricated in the casting process. The phase compositions and microstructure were analyzed by X-ray diffraction (XRD) and optical microscopy (OM), respectively. The hardness and impact toughness were tested by Rockwel-hardmeter and impacting test enginery. And then, the morphology of fracture was researched by scanning electron microscopy (SEM). The results demonstrated that the phase compositions of HCCIs with addition of RE nanoparticles or inoculants which were M7C3 carbides + α-Fe did not change obviously. However, the prime M7C3 carbides morphology had great changes with the increase of RE nanoparticles, which changed from long lath to granular or island shape. When the content of RE nanoparticles was 0.4 wt.%, the microstructure of high chromium cast iron was refined greatly. The microstructure of carbides was coarser when the addition of RE nanoparticles was higher than 0.4 wt.%. The hardness and impact toughness of HCCIs were improved by addition of RE nanoparticles or inoculants. The impact toughness of HCCIs was increased 36.4% with RE nanoparticles of 0.4 wt.%, but the hardness changed slightly. In addition, the adding of RE nanoparticles or inoculants could reduce the degree of the brittle fracture. Fracture never seemed regular, instead, containing lots of laminates and dimples with the increase of the RE nanoparticles. The results also indicated that the optimal addition amount of the RE nanoparticles was 0.4%, under this composition, the microstructure and mechanical property achieved the best cooperation. In addition, through the study of erosion wear rate, when adding 0.4% RE nanoparticles into the HCCIs, the erosion wear rate got the minimum 0.32×10-3 g/mm2, which could increase 51.5% compared with that without any RE nanoparticles.     

Microstructure of electrodeposited RE-Ni-W-P-SiC composite coating

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氯碱工业活性阴极的研究

介绍了氯碱工业中活性阴极的发展现状,并通过电沉积法制备了一种合金电极,对其电镀工艺进行了探讨,得出了最佳工艺条件:镍∶钐=1∶1;电镀时间为120 min;温度为20℃;pH值=4.并对其使用寿命和耐腐蚀性能进行了简单测试,性能比铁电极好.