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Li对7075铝合金钻杆材料微观组织与摩擦磨损行为的影响 被引量:3
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作者 颉芳霞 张文成 +3 位作者 张世文 陆东兴 孙琪超 何雪明 《材料工程》 EI CAS CSCD 北大核心 2023年第9期78-86,共9页
采用热压烧结制备7075-(0%,0.5%,1%,2%,质量分数,下同)Li合金,研究Li对7075铝合金微观组织及摩擦磨损性能的影响。结果表明:7075-0.5Li合金在60 kN烧结压力下致密度可达到99%以上。铝合金由α-Al相、η相和S'相组成;随着Li含量增加... 采用热压烧结制备7075-(0%,0.5%,1%,2%,质量分数,下同)Li合金,研究Li对7075铝合金微观组织及摩擦磨损性能的影响。结果表明:7075-0.5Li合金在60 kN烧结压力下致密度可达到99%以上。铝合金由α-Al相、η相和S'相组成;随着Li含量增加至2%,η相减少,δ'相、δ相增多,但α-Al仍为主相。铝合金的硬度和磨损率分别为71.25HV和3.50×10^(-3)mm^(3)·N^(-1)·m^(-1),随Li含量增加,铝锂合金硬度降低,磨损率升高,但7075-0.5Li比铝合金的硬度更高,磨损率更低。7075-Li合金均发生了氧化磨损,同时还发生了黏着磨损。铝锂合金随Li含量增加,η相减少,硬度降低,Al2O3脆性大从而与基体结合较弱,微观组织枝晶间距增大,导致合金由磨粒磨损逐渐转变为黏着磨损,耐磨性能逐渐降低。与铝合金相比,热压烧结制备的7075-0.5Li合金显示了更好的耐磨性能。 展开更多
关键词 热压烧结 铝锂合金 微观组织 磨损行为
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Highly Durable and Fast Response Fabric Strain Sensor for Movement Monitoring Under Extreme Conditions 被引量:10
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作者 dongxing lu Shiqin Liao +4 位作者 Yao Chu Yibing Cai Qufu Wei Kunlin Chen Qingqing Wang 《Advanced Fiber Materials》 SCIE EI 2023年第1期223-234,共12页
The exploration of smart electronic textiles is a common goal to improve people’s quality of life.However,current smart e-textiles still face challenges such as being prone to failure under humid or cold conditions,l... The exploration of smart electronic textiles is a common goal to improve people’s quality of life.However,current smart e-textiles still face challenges such as being prone to failure under humid or cold conditions,lack of washing durability and chemical fragility.Herein,a multifunctional strain sensor with a negative resistance change was developed based on the excellent elasticity of knitted fabrics.A reduced graphene oxide(rGO)conductive fabric was first obtained by electrostatic self-assembly of chitosan(CS).Then a strain sensor was prepared using a dip-coating process to adsorb nanoscale silica dioxide and poly(dimethylsiloxane)(PDMS).A broad working range of 60%,a fast response time(22 ms)and stable cycling durability over 4000 cycles were simultaneously achieved using the prepared sensor.Furthermore,the sensor showed excel-lent superhydrophobicity,photothermal effects and UV protection,as graphene,silica and PDMS acted in synergy.This multifunctional sensor could be mounted on human joints to perform tasks,including activity monitoring,medical rehabili-tation evaluation and gesture recognition,due to its superior electromechanical capabilities.Based on its multiple superior properties,this sensor could be used as winter sportswear for athletes to track their actions without being impacted by water and as a warmer to ensure the wearer's comfort. 展开更多
关键词 Multifunctional strain sensor Fabric surface modification SUPERHYDROPHOBICITY PHOTOTHERMAL Human movement detection
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