Study on Preparation of Hard Elastic Polypropylene Fibers

2013 ◽  
Vol 743-744 ◽  
pp. 414-419
Author(s):  
Si Deng Zhang ◽  
Xu Zhen Zhang ◽  
Bin Sun ◽  
Long Chen ◽  
Zhi Yan Ma ◽  
...  
Keyword(s):  
Annealing Time ◽  
Melt Spinning ◽  
Annealing Temperature ◽  
Elastic Recovery ◽  
Annealing Treatment ◽  
Annealing Process ◽  
Fiber Axis ◽  
Polypropylene Fibers ◽  
Structure And Property ◽  
Velocity Anisotropy

Polypropylene pre-oriented multifilament were made by melt spinning with fast winding, and then hard elastic polypropylene fibers were made followed by annealing treatment under some conditions. The effects of the conditions of melt spinning and annealing process on the elasticity of polypropylene fibers were studied. The structure and property of hard elastic polypropylene fibers were analyzed by DSC,WAXD,SAXS and Sound velocity anisotropy. The results showed that the hard elasticity of annealed fibers increased with the improving of speed of winding, and the elasticity also increased with the improving of annealing temperature and extension of annealing time, and the elastic recovery rate of PP multifilament can be as high as 93.6%. The crystal phase of unannealed and annealed PP fibers did not change. Annealing leaded to form perfectly the characteristic crystalline structure of crystals of being perpendicular to fiber axis.

Effect of Homogenization Annealing on Wear Properties of Thixo-Extrued Copper Alloy

2022 ◽  
Vol 327 ◽  
pp. 71-81
Author(s):  
Yun Xin Cui ◽  
Han Xiao ◽  
Chi Xiong ◽  
Rong Feng Zhou ◽  
Zu Lai Li ◽  
...  
Keyword(s):  
Friction Factor ◽  
Annealing Time ◽  
Copper Alloy ◽  
Loss Rate ◽  
Annealing Temperature ◽  
Brinell Hardness ◽  
Annealing Process ◽  
Wear Properties ◽  
Wear Performance ◽  
Semi Solid

The semi-solid extruded CuSn10P1 alloy bushings were homogenization annealed. The effects of annealing process on the hardness and wear properties of bushings were researched. The results show the Brinell hardness increases firstly and then decreases with the increase of annealing temperature and annealing time. With the annealing temperature increasing, the grinding loss rate and friction factor decrease firstly and then increase. At the annealing time of 120 min, the grinding loss rate decreases from 7% at the annealing temperature of 450 °C to 6% at 500 °C, and then increases from 6% at 500 °C to 12% at 600 °C. The friction factor decreases from 0.54 to 0.48 and then increases to 0.83. At the annealing temperature of 500 °C, the grinding loss rate decreases from 11% at the annealing time of 60 min to 6% at 120 min, and then increases to 15% at 150 min. The friction factor decreases from 0.67 to 0.48 and then increases to 0.72. The best wear performance and Brinell hardness can be obtained at annealing temperature of 500 °C for 120 min.

Analysis of Preform Annealing Process for the Aluminum Automotive Door Inner Panel

2016 ◽  
Vol 850 ◽  
pp. 618-624
Author(s):  
Yu Juan Yang ◽  
Jian Pin Lin ◽  
Bin Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Annealing Time ◽  
Annealing Treatment ◽  
Annealing Process ◽  
Geometric Shape ◽  
Complex Geometric Shape ◽  
Deformation Amount

To improve the formability of aluminum alloy, a new forming technique-the preform annealing process is proposed. Based on the mechanical properties of the original aluminum alloy AA5182-O with two experienced preforming annealing treatment, and preforming annealing process of a complex geometric shape aluminum door inner panel was numerical simulated by using LS-DYNA software. As a result, the effects of annealing time at 365°C on stamping height of the panel and the optimum annealing time were obtained. The results showed that the preform annealing process was feasible in the door inner panel. At 365°C, the smooth forming of the door inner panel was achieved after annealing for 20s with the pre-deformation amount 97mm, Which are the most suitable parameters.

Effect of Annealing on Mechanical Properties of Copper Alloys Deformed at Cryogenic Temperature

2013 ◽  
Vol 745-746 ◽  
pp. 363-370 ◽  
Author(s):  
Xiao Xiang Wu ◽  
Yu Lan Gong ◽  
Shi Ying Ren ◽  
Jing Mei Tao ◽  
Yan Long ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Annealing Temperature ◽  
Uniform Elongation ◽  
Copper Alloys ◽  
Annealing Treatment ◽  
Annealing Process ◽  
Optimal Annealing Temperature ◽  
Elongation To Failure ◽  
Cold Rolled ◽  
Zn Alloys

The effect of annealing treatment on the mechanical properties and microstructure of cold-rolled Cu-20% Zn alloys was investigated in this work. Mechanical properties changed dramatically with the increase of temperature. According to the microhardness test, it can roughly concluded that 150 is the optimal annealing temperature for deformation, at which a uniform elongation increased from 1.4658% before annealing to about 6.89%, and the elongation to failure increased from 7.426% to 16.81% with the same strength almost retained. The changes of microstructure during the annealing process are mainly distributed to the improvement of mechanical properties.

Effect of Annealing Temperature on Mechanical Properties of Cold Drawn Pearlitic Steel Wires

2006 ◽  
Vol 118 ◽  
pp. 31-34 ◽  
Author(s):  
Won Jong Nam ◽  
Hyung Rak Song ◽  
Kyung Tae Park
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Pearlitic Steel ◽  
High Annealing Temperature ◽  
Annealing Temperatures ◽  
Steel Wires ◽  
High Annealing

The effects of annealing temperature and annealing time on mechanical properties of cold drawn pearlitic steel wires containing 0.84wt% of silicon were investigated. Annealing treatment was performed on cold drawn steel wires for the temperature range of 200°C to 450°C with the different annealing time of 30sec, 1min, 15min and 1hr. The increase of tensile strength at the low annealing temperatures would be related with strain ageing behavior, while the decrease of tensile strength at the high annealing temperature is due to the spheroidization of cementite plates and the occurrence of recovery of the lamellar ferrite in the pearlite.

Effects of Processing Technic on Grain Size of Copper Clad Steel Wire

2012 ◽  
Vol 567 ◽  
pp. 116-122 ◽  
Author(s):  
Qing Mei Wu ◽  
De Qing Wang ◽  
Yang Gao
Keyword(s):  
Grain Size ◽  
Cross Section ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Steel Wire ◽  
Annealing Treatment ◽  
Longitudinal Section ◽  
Diameter Ratio ◽  
Strip Shape ◽  
Clad Steel

The method adopted to manufacture copper clad steel wire in this study is cladding and welding and then drawing and annealing it. The effect of drawing deformation and annealing treatment on the grain size of α-Fe phase were studied. Experimental results show that the grain sizeα in cross section of α-Fe phase is decreased with the increase of the drawing deformation. Grains of the longitudinal section are elongated toward the drawing direction and appeared a strip shape. The grain size in cross-section of α-Fe phase is enhanced with the increase of the annealing time and annealing temperature, its length diameter ratio in longitudinal section is decreased oppositely. The grain size in cross section and length diameter ratio in longitudinal section are almost invariant in 850 °C for 2 h, the grain in longitudinal section tends to be equiaxial, the recrystallization processes is thus finished at this moment. Through the experimental data analysis, the regression equation about the relation of annealing temperature and annealing time of CCS with the grain size in cross section and length diameter ratio in longitudinal section are obtained.

scholarly journals Ultrasensitive Anomalous Hall Effect in Ta/CoFe/Oxide/Ta Multilayers

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Guang Yang ◽  
Yongye Li ◽  
Xi Chen ◽  
Jingyan Zhang ◽  
Guanghua Yu
Keyword(s):  
Magnetic Anisotropy ◽  
Hall Effect ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Anomalous Hall Effect ◽  
Annealing Process ◽  
Hall Resistance ◽  
Oxide Material ◽  
Two Samples ◽  
New Perspective

Ultrahigh anomalous Hall sensitivity has been demonstrated in Ta/CoFe/Oxide/Ta multilayers. By changing oxides (MgO and HfO2) and annealing temperature, different annealing dependence of sensitivity was found in MgO-sample and HfO2-sample. For the MgO-sample, the anomalous Hall sensitivity reaches 18792 Ω/T in the as-deposited state and significantly reduces as annealing temperature increases. On the contrary, the sensitivity of the as-deposited HfO2-sample is only 765 Ω/T, while it remarkably increases with annealing temperature increasing, finally reaching 14741 Ω/T at 240°C. The opposite variation of anomalous sensitivity in two samples originates from the different change of magnetic anisotropy and anomalous Hall resistance during the annealing process. Our study provides a new perspective that both the choice of oxide material and the optimization of annealing treatment are important to the anomalous Hall sensitivity.

Influence of Processing Parameters on the Texture Formation in Powder Metallurgic Ni-5at.%W Substrate Tapes

2007 ◽  
Vol 546-549 ◽  
pp. 1997-2002 ◽  
Author(s):  
Shao Kai Chen ◽  
C.F. Liu ◽  
Ping Xiang Zhang ◽  
Lian Zhou
Keyword(s):  
Cold Rolling ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Cube Texture ◽  
Annealing Treatment ◽  
Processing Parameters ◽  
Thickness Reduction ◽  
Texture Formation ◽  
Total Thickness ◽  
Electron Back Scattered Diffraction

Influence of cold rolling total thickness reduction, annealing temperature and annealing time on the textures in powder metallurgic Ni-5at.%W substrate tapes have been quantitatively investigated with the EBSD (Electron Back-Scattered Diffraction) technique. A “copper” type-like texture consisting of {1 2 3}<6 3 –4>+{0 1 –1}<3 –1 –1>+{1 –1 2}<1 –1 –1> has been found in the as-rolled tapes. This texture was much intensive in the tape at 99% thickness reduction than in the tape at 87% thickness reduction. The 99% reduction tape showed a higher fraction and sharper cube texture than the 87% reduction tape after annealing treatment. In addition, annealing at 1000°C was much favourable for the cube texture formation than annealing at 950°C and resulted in a higher cube texture fraction.

scholarly journals INVESTIGATION OF FABRICATION OF Co-Zr BASED RARE EARTH-FREE HARD MAGNETIC ALLOYS BY MELT-SPINNING METHOD

2018 ◽  
Vol 56 (1A) ◽  
pp. 13
Author(s):  
Nguyen Van Duong
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Melt Spinning ◽  
Annealing Temperature ◽  
Xrd Analysis ◽  
Maximum Energy ◽  
Annealing Process ◽  
High Coercivity ◽  
Hard Magnetic Materials ◽  
Energy Product

Co-Zr based alloy has attracted much interest of potential to replace the rare earth-containing hard magnetic materials due to its high coercivity. In this study, we investigated the effects of subtituting elements of M (Ti, Si and Nb) and annealing temperature on the structure and magnetic properties of Co79-xZr18+x-yMyB3 alloy ribbons (x = 0 - 2, y = 0 - 4). The alloy ribbons with a thickness of 20 µm were prepared by melt-spinning method with a rolling speed of 40 ms-1. A part of the melt-spun ribbons was annealed at different temperatures from 550 to 800 oC for various durations from 2 to 15 minutes. Their structure and magnetic properties were investigated by X-ray diffraction (XRD) and a pulsed field magnetometer (PFM), respectively. The results of the XRD analysis showed that two soft magnetic phases, namely Co and Co23Zr6, coexist with a Co5Zr hard magnetic phase in the alloy ribbons. The fraction of these phases was changed with both the concentration of the subtituting elements and annealing process. Hard magnetic properties of the alloy ribbons can be strengthened significantly, namely a large coercivity Hc > 4 kOe and maximum energy product (BH)max > 3.5 MGOe were obtained with an appropriate concentration of Ti, Si or Nb and annealing process. Furthermore, the subtituting elements also affect the optimal annealing temperature for these alloys. The obtained strong hard magnetic parameters of these rare earth-free alloys are of great importance in pratical application.

Effects of Alloy Composition and Annealing Treatment on the Performance of Aluminum Conductor

2013 ◽  
Vol 652-654 ◽  
pp. 1016-1022
Author(s):  
Wen Ping Chen ◽  
Yong Su ◽  
Ping Hu ◽  
Yan Jiang
Keyword(s):  
Mechanical Properties ◽  
Annealing Temperature ◽  
Alloy Composition ◽  
Annealing Treatment ◽  
Annealing Process ◽  
Orthogonal Test ◽  
Holding Time ◽  
Test Analysis ◽  
Elongation At Break ◽  
Iron Copper

Discuss how iron, copper and magnesium alloy and rare earth cerium influence the electrical and mechanical properties of aluminum conductor using the orthogonal test, to thereby get the best alloy composition that meets the requirement; through test analysis on the conductivity, intensity and elongation at break of aluminum conductor with the best alloy composition, discuss the influence of different annealing temperature and holding time on their performance. The results show that: the best material composition of the aluminum alloy conductor would be 0.25% Fe, 0.40% Cu, 0.05% Mg, 0.30% Ce, 0.008% B, and aluminum and inevitable impurities. The intensity, elongation at break and conductivity of this aluminum conductor would be 110N/mm2, 30.0% and 62.2%IACS respectively. The best annealing process parameters are annealing temperature of 310°C, and holding time for 30min, direct air cool. The intensity of aluminum conductor processed is 129 N/mm2, and the elongation at break, resistivity, and conductivity are 15.0%, 2.782×10-8Ω•m and 62%IACS respectively. The mechanical properties and conductivity of this aluminum conductor both comply with the requirements of wire and cable conductor cores.

The Morphology in Film of Polystyrene-b-Polylactide after Temperature Annealing Process

2015 ◽  
Vol 1095 ◽  
pp. 647-650
Author(s):  
Ting Chen ◽  
Jia Nan Zhang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Separation ◽  
Block Copolymer ◽  
Annealing Time ◽  
Self Assembly ◽  
Annealing Temperature ◽  
Annealing Process ◽  
Temperature Gradients ◽  
Si Substrates

Polystyrene-b-Polylactide (PS-b-PLA) was dissolved in chlorobenzene, and the development of the micro-phase separation morphology in asymmetric PS-b-PLA thin films was investigated by AFM. The thin films were prepared by spinning casting at the speed of 6000 r/min for 60s on Si substrates. We get different morphologies of PS-b-PLA thin film by changing the annealing temperature from 150 °C to 170 °C. In addition, the annealing time influences the morphology of the film. When the annealing time increased from 2 hours to 15 hours and 30 hours, the morphology transformed from parallel to perpendicular to the substrate. By applying temperature gradients, we can control the morphology and orientation of the Block copolymer film self-assembly.

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