Experimental methods, such as OM, SEM and X-EDS, were used to study the microstructure of X80 pipeline steel. It mainly consists of fine acicular ferrite (AF). X80 pipeline steel possesses high strength and impact ene...
详细信息
The effect of peak temperature on austenite grain size was investigated by using thermal simulation and OM, TEM analysis. Grains grow slowly below 1250°C, and dramatically grow up as the temperature exceeds 1350&...
详细信息
The corrosion resistance layers can be surfaced in the valve casted by carbon steel, to enhance the corrosion resistance performance. By the 3D solid model, the weight and internal area of valve body was obtained. The...
详细信息
Previous studies indicate that although flame-retardant modified polyamide 6 shows effective reduction in heat release capacity, it suffers significant loss in ductility. In this study, elastomer toughening is explore...
详细信息
Previous studies indicate that although flame-retardant modified polyamide 6 shows effective reduction in heat release capacity, it suffers significant loss in ductility. In this study, elastomer toughening is explored as a means of recovering ductility of polyamide 6/ intumescent flame retardant composite systems. This was achieved using a maleic anhydride modified SBR elastomer incorporated into the system by melt blending. MCC Flammability tests show that the blends with elastomers exhibit slightly improved flame retardant properties compared to the original polyamide 6/intumescent flame retardant system however the UL-94 rating of elastomer toughened samples were only rated as V-1. Therfore nanoclay was introduced as a fourth component to perform as a synergistic additive to the intumescent flame retardants. With small amount (5wt.%) of nanoclay, a UL-94 V-0 rating was achieved with even lower flame retardant concentreation (15wt.% flame retardant and 10wt.% elastomer). Tensile tests show that the incorporation of flame retardant additives and elastomers degrade the tensile strength compared to neat polyamide 6. On the other hand, the addition of flame retardant enhanced the tensile modulus, while the addition of elastomers succeeded in partially recovering the lost elongation at break. Copyright 2015 by Hao Wu. Published by CAMX-The Composites and Advanced materials Expo with permission.
We address the stability of the surface phases that occur on the C side of 3C−SiC(1¯1¯1¯) at the onset of graphene formation. In this growth range, experimental reports reveal a coexistence of several s...
We address the stability of the surface phases that occur on the C side of 3C−SiC(1¯1¯1¯) at the onset of graphene formation. In this growth range, experimental reports reveal a coexistence of several surface phases. This coexistence can be explained by a Si-rich model for the unknown (3×3) reconstruction, the known (2×2)C adatom phase, and the graphene-covered (2×2)C phase. By constructing an ab initio surface phase diagram using a van der Waals corrected density functional, we show that the formation of a well defined interface structure like the “buffer layer” on the Si side is blocked by Si-rich surface reconstructions.
The development of polymeric anion‐exchange membranes (AEMs) combining high ion conductivity and long‐term stability is a major challenge for materials chemistry. AEMs with regularly distributed fixed cationic group...
详细信息
The development of polymeric anion‐exchange membranes (AEMs) combining high ion conductivity and long‐term stability is a major challenge for materials chemistry. AEMs with regularly distributed fixed cationic groups, based on the formation of microporous polymers containing the V‐shape rigid Tröger's base units, are reported for the first time. Despite their simple preparation, which involves only two synthetic steps using commercially available precursors, the polymers provide AEMs with exceptional hydroxide conductivity at relatively low ion‐exchange capacity, as well as a high swelling resistance and chemical stability. An unprecedented hydroxide conductivity of 164.4 mS cm −1 is obtained at a relatively a low ion‐exchange capacity of 0.82 mmol g −1 under optimal operating conditions. The exceptional anion conductivity appears related to the intrinsic microporosity of the charged polymer matrix, which facilitates rapid anion transport.
Icing(or ice accretion) is a phenomenon in which super-cooled water droplets impinge and accrete on a *** is well known that ice accretion on blades and vanes leads to performance degradation and has caused severe ***...
详细信息
Icing(or ice accretion) is a phenomenon in which super-cooled water droplets impinge and accrete on a *** is well known that ice accretion on blades and vanes leads to performance degradation and has caused severe *** various anti-icing and deicing systems have been developed,such accidents still ***,it is important to clarify the phenomenon of ice accretion on an aircraft and in a jet ***,flight tests for ice accretion are very expensive,and in the wind tunnel it is difficult to reproduce all climate conditions where ice accretion can ***,it is expected that computational fluid dynamics(CFD),which can estimate ice accretion in various climate conditions,will be a useful way to predict and understand the ice accretion *** the other hand,although the icing caused by super-cooled large droplets(SLD) is very dangerous,the numerical method has not been established *** is why SLD icing is characterized by splash and bounce phenomena of droplets and they are very complex in *** the present study,we develop an ice accretion code considering the splash and bounce phenomena to predict SLD icing,and the code is applied to a fan rotor *** numerical results with and without the SLD icing model are *** this study,the influence of the SLD icing model is numerically clarified.
The structural health monitoring of endless fiber-reinforced plastics (FRPs), as well as the monitoring of textile membranes for civil engineering applications, plays a crucial role for the advancement of lightweight ...
详细信息
The structural health monitoring of endless fiber-reinforced plastics (FRPs), as well as the monitoring of textile membranes for civil engineering applications, plays a crucial role for the advancement of lightweight design approaches. It is only through structurally integrated condition monitoring systems, that damages can be detected early on, thus enabling local repairs before complete structural failure occurs. The performance can furthermore be considerably extended or increased by an additional functionalization, e. g. textile-processible and structurally integrated sensors and actuators in the same FRP component.
Most additive manufacturing processes are layer-by-layer deposition, thus its mechanical properties could be very different than those made from traditional manufacturing processes. This paper summarizes a mini-tensil...
详细信息
The light guide rod (LGR) has been popularly used for the vehicles, and the automobile lamp industries need mass production to match this trend. This paper aims to develop a systemic way to find the best parameters...
详细信息
暂无评论