钢铁材料半固态浆料制备机

设计制造的钢铁材料半固态浆料制备机(SSM2系列)采用电磁搅拌和活化制浆室控制凝固过程,搅拌参数通过变频器进行设定和控制;采用接触式热电偶测温与非接触式红外测温相结合进行熔体温度的实时检测与闭环调节;采用滑板式注口控制半固态浆料的浇注;整机采用集成的控制系统实现搅拌、冷却和浇注的自动控制.其最高工作温度1 550 ℃,制备效率6～10 kg/min,可以为流变成形和触变成形制备合格的半固态浆料.     

复合材料和半固态加工技术

通过阐述半固态技术的原理、主要制坯方法和主要工艺并结合具体制件的生产实践验证,研究了复合材料加工与半固态的关系.通过研究表明采用半固态成形技术,制备复合材料及其成形,是一种较好的方法.其主要特征是;复合材料制备方法简单,成本低,周期短,易为工业生产所应用,特别是制备与成形合为一体时,其优越性显著.     

半固态金属材料的制备技术及应用

半固态金属成形技术的关键是制备非枝晶结构的半固态金属材料。本文论述了半固态金属材料制备工艺的基本原理与特点 ,介绍了半固态金属材料制备技术的现状与发展概况 ,并展望了半固态金属材料制备技术在我国应用的前景和意义     

半固态材料成形应用

半固态加工是金属材料热加工的新兴技术，它与固态加工、液态加工同属金属加工领域：主要介绍了半固态金属浆料的制备、半固态加工的工艺方法、半固态加工的应用及未来发展趋势，以期推动其理论研究和工业发展。     

半固态材料制备的研究现状和发展趋势

半固态加工的优越性完全依赖于半固态材料所需具备的特殊组织结构,即细小球状固态颗粒均匀悬浮于液态基体中而形成液固共存的半固态组织.对现有的半固态材料的制备工艺进行了总结,主要有机械搅拌法,电磁搅拌法,促进凝固过程形核,外加晶粒细化剂,SIMA工艺和雾化成型工艺.还结合半固态加工的工艺路径流变成形和触变成形,提出上述半固态材料制备方法的发展趋势.     

半固态连接技术现状及展望

论述了国内外半固态连接技术的研究现状,重点讨论了各种半固态连接方法的优缺点,展望了外加能量辅助半固态连接技术的应用前景和研究方向.     

半固态金属成形技术的研究及应用

概述了近几年来半固态金属加工技术的发展现状，主要对半固态金属的形成机理、制备方法、成形工艺等进行了介绍，综述了国内外半固态金属成形技术的应用现状，并对我国半固态金属成形技术的发展动向进行了讨论。     

半固态金属成形技术的研究及应用

概述了近几年来半固态金属加工技术的发展现状,主要对半固态金属的形成机理、制备方法、成形工艺等进行了介绍,综述了国内外半固态金属成形技术的应用现状,并对我国半固态金属成形技术的发展动向进行了讨论。     

半固态金属成形技术的研究及应用

概述了近几年来半固态金属加工技术的发展现状，主要对半固态金属的形成机理、制备方法、成形工艺等进行了介绍，综述了国内外半固态金属成形技术的应用现状，并对我国半固态金属成形技术的发展动向进行了讨论。     

半固态金属浆料制备技术的研究进展

总结了30余年来半固态金属浆料制备技术的研究和应用现状,分别介绍了压室浆料制备技术、单螺旋机械搅拌浆料制备技术、双螺旋机械搅拌浆料制备技术、低过热度倾斜板浇注浆料制备技术、低过热度浇注和弱机械搅拌浆料制备技术、连续流变转换浆料制备技术、低过热度浇注和弱电磁搅拌浆料制备技术、蛇形通道浇注浆料制备技术、熔体分散混合浆料制备技术、转桶搅拌浆料制备技术、波浪倾斜板浇注浆料制备技术、旋转倾斜圆筒浆料制备技术、超声振动浆料制备技术、熔体处理和双向电磁搅拌浆料制备技术、低于液相线温度浆料制备技术、偏旋热焓平衡浆料制备技术、气泡搅拌浆料制备技术及其发展前景。     

Joining process and strength in PVC friction stir spot welding with fabricating composite material at welding area*

In order to improve the strength of FSSWed PVC joints, SiC particles were compounded into the welded region at the same time as the welding process. The joining process and its effect on strength of FSSWed PVC joints were investigated in a joining experiment with a PVC plate having a different guide hole diameter for filling the SiC particles. In the case of the specimen compounded with SiC particles with guide hole diameter of 8 mm, SiC particles could be dispersed uniformly in the welded area. In the specimens with guide hole diameters of 5 and 2 mm, dispersion of SiC particles was not observed inside of the welded area. Degradation and increase in local mechanical property was significantly observed at edge of the keyhole and inside the welded area, respectively, in the specimen with a guide hole diameter of 8 mm. The width of welded area increased with increasing guide hole diameter. The joining strength was improved by fabricating composite material in the welded region. The strength increased with increasing guide hole diameter. It is considered that joining strength was significantly affected by the width of the welded area. According to temperature distribution and observation of material flow using a high speed camera, contact between the welding tool and SiC particles before plunging into a lower sheet induced increasing heat input during the process and resulted in promoting the friction stirring. Therefore, it is considered that change in guide hole diameter leads to change in contact area between welding tool and SiC particles and also change in width of the welding area resulting in change in the joining strength.     

Characteristics of deformation joining of aluminum-stainless steel composite sheet

1　INTRODUCTIONAseveryoneknows ,aluminumandstainlesssteelaredifficulttoweldtogether[16 ] .Inthepast,braz ing ,projectionweldingaswellasaluminizingwereused .Nowadays ,anewmethodisputforward ,inwhichthealuminumsheetandstainlesssteelsheetheatedbyinductionheaterareconnectedbypressureofascrew press .Notonlycanthismethodimprovebondingbehaviorofthecompositesheet,butalsocanitraisetheproductivity greatly .Thistechnologyiscalleddeformationjoining ,i.e .pressjoining .InChi na ,ithasbeensuccessfully…     

镁基复合材料半固态压铸过程的数值模拟

对镁基复合材料半固态充型凝固过程进行数值模拟,并进行半固态流变成形实验。结果表明,在液态充型过程中,压力变化非常紊乱;而在固态充型过程中,压力在推进方向上逐渐降低,这将产生有利于充型的背压。凝固过程的固相体积分数变化表明:在半固态充型条件下,整个铸件基本上是同时凝固,从而可有效地避免在液态充型时产生缩孔缩松。实验结果与模拟结果吻合,半固态流变成形件的质量优于液态成形件的质量。     

镁基复合材料半固态压缩变形工艺研究

研究了半固态SiCp/AZ61复合材料在不同变形温度、应变速率、SiCp体积分数和变形程度下的微观组织演变。结果表明,在半固态压缩条件下,在压缩变形过程中随着温度的提高,试样的内摩擦系数减小,使得固相颗粒或者聚集体发生滑动和转动的可能性增加。随应变速率的减小,低应变速率下微观组织中的液相分布在基体周围。随着变形程度的增加,晶粒平均尺寸显著减小。     

Yield condition and compression characteristics of semi-solid material by upper-bound method

In semi-solid forging, it is necessary to control the forming variables accurately in order to make near net shape products. Generally, the defects of products may occur due to liquid segregation that can be caused by deformation, strain rate, and condition of friction. The liquid segregation is to be predicted by flow analysis. This paper presents upper bound analysis model using the new yield function proposed by Doraiveluet al. The model has been applied to analyze the simple compression process of semi-solid Sn-15%Pb alloys to confirm the usefulness of the yield function. The radial distribution of the liquid fraction at various strains, strain rates, and friction conditions between die and workpiece has been estimated.     

塑性成形技术在金属复合管制备中的应用及展望

按金属界面间形成结合方式,机械结合和冶金结合,对目前国内外金属复合管的主要塑性成形制备技术进行了分类。对拉拔法、滚压法、旋压法、轧制法、抽真空法、液压胀形法和复合挤压法、爆炸成形法、多坯料挤压法、电磁成形法等各种塑性成形制备技术,进行了较详细的介绍和比较,指出各自的优缺点,并与离心技术法、消失模真空吸铸法、中频感应加热钎焊法等几种非塑性成形制备技术进行了比较,对其未来的发展趋势进行了展望。     

微特征铝合金半固态流动性能试验研究

为了研究半固态材料在微尺度下的充型能力,设计并加工了锥形槽微型模具。使用ZL101铝合金材料,将径向断面填充面积比作为评价参数,分析模具槽宽尺寸、成形温度对半固态微尺度充型能力的影响。试验表明,在半固态温度区间挤压成形,在流动性上没有出现固态金属所表现出的"尺度效应"。     

陶瓷先驱体聚硅氮烷连接Cf/SiC工艺及连接性能

采用陶瓷先驱体转化法连接Cf／SiC复合材料。针对Cf／SiC复合材料的不同连接界面特性,采用不同的连接配方和工艺。结果表明：对于第一类以SiC相为主的连接界面,采用单一的聚硅氮烷即可实现Cf／SiC复合材料的连接,当连接温度为1300℃,经两次浸渍／裂解增强处理的连接件接头抗剪强度达最大值29．6MPa;连接层厚度为2～3μm,其结构较为均匀致密,由无定型SiNC陶瓷组成;对于第二类以C纤维端面为主的连接界面,采用聚硅氮烷并加入活性填料纳米Al粉来实现其连接：当连接温度为1150℃,经两次浸渍／裂解增强处理的连接件抗剪强度达最大值22．5MPa;连接层厚度约为30μm,连接层中含有SiC、Si3N4和AlN等相。     

21世纪海洋工程连接技术的挑战与对策

在解释海洋工程连接技术内涵的基础之上,针对21世纪中国海洋石油开发深水资源的巨大挑战,对深水海底管道铺设焊接、局部干式焊接、水下干式高压焊接以及摩擦叠焊等重要技术进行了介绍,其中包括北京石油化工学院海洋工程连接技术研究中心开展的相关研究工作,最后提出了发展中国海洋工程连接技术的对策.     

A highly efficient hybrid inductive joining technology for metals and composites

A hybrid technology of inductive contact joining (ICJ) was developed to join fibre-reinforced thermoplastics (FRP) with metals by using a tool with single-sided heating. In comparison to conventional methods with separate heating, pressing and cooling, the unique new hybrid ICJ process is characterized by combining all three steps into one hybrid process. The maximum temperature is shifted toward the joining zone due to the direct cooling effect of the surface. FE simulations showed the temperature distributions within the joint. The performed experiments provided data for the temperature profile of the process and the resulting strength of the joint, type of damage and microstructural characteristics. Proven advantages include very short cycle time, competitive joint strength and limited influence on the mechanical properties of the metallic component.