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PSZ—Mo系梯度功能材料的热应力缓和设计与制备 总被引:10,自引:0,他引:10
对PSZ-Mo系梯度功能材料在制备过程中的热应力缓和性能进行了优化设计,用有限元方法解析了PSZ-Mo系两层叠层材料(即非梯度功能材料)在制备过程中的热应力分布情况。同时解析了PSZ-Mo系FGM在制备过程中的热应力分布及缓和规律。揭示了PSZ-Mo系FGM在制备过程中的热应力大小与组成分布形状指数P的关系,对所研究的体系通过热应力缓和最佳时的P值,同时,对FGM的制备工艺进行了研究,用粉末法分别 相似文献
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Ni/Ni3Al—TiC系梯度功能材料的热应力缓和特性设计 总被引:1,自引:0,他引:1
本文选择Ni/NiAl-TiC体系的FGM,对其在制备过程中的残余絷应力进行了计算机有限元模拟。在综合考虑热应力最小,应力强度比值最小以及纯TiC侧应力状态等因素的基础上,完成了FGM体系的热应力缓和特性设计,得到组成分布指数P=1.6的最佳设计结果。 相似文献
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PSZ-Mo系梯度功能材料的热应力缓和设计与制备 总被引:3,自引:0,他引:3
对PSZ-Mo系梯度功能材料(functionallygradientmaterials简称FGM)在制备过程中的热应力缓和性能进行了优化设计,用有限元方法解析了PSZ-Mo系两层叠层材料(即非梯度功能材料)在制备过程中的热应力分布情况。同时解析了PSZ-Mo系FGM在制备过程中的热应力分布及缓和规律。揭示了PSZ-Mo系FGM在制备过程中的热应力大小与组成分布形状指数P的关系,对所研究的体系通过热应力解析,得到制备中热应力缓和最佳时的P值,同时,对FGM的制备工艺进行了研究,用粉末法分别制备出24mm×5.6mm和30mm×5mm完整的FGM试样。 相似文献
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陶瓷刀具材料的现状与发展 总被引:3,自引:0,他引:3
本文阐述了陶瓷刀具材料的发展现状 ,着重论述了氧化铝系陶瓷和氮化硅系陶瓷材料技术。对陶瓷刀具材料的发展趋势进行了综述。指出超微粉刀具、复相陶瓷刀具、涂层刀具及金属陶瓷是陶瓷刀具材料的研究方向。 相似文献
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TiC/Ni3Al系梯度功能材料在稳定状态下的隔热应力及其组成分布优化 总被引:4,自引:0,他引:4
通过实验方法,测定了TiC/Ni3Al复合材料的诸物性参数,在此基础上,对于TiC/Ni3Al系梯度材料(FGM)在稳定状态下产生的隔热应力,利用有限元方法进行了热弹性模型下的三维解析,在考虑热应力最小,比应力最小以及TiC侧应力状态等因素之后,对圆反状TiC/Ni3Al系梯度材料的组成分布进行了优化。 相似文献
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T. Sornakumar R. Krishnamurthy C. V. Gokularathnam 《Journal of the European Ceramic Society》1993,12(6):455-460
Phase transformation toughened zirconia (TTZ) doped with yttria or ceria has excellent properties such as higher order fracture toughness, thermal shock resistance and moderate hardness. With these qualities, they are able to exhibit machining performance comparable to cold-compacted Al2O3 cutting tools. With an addition of 20% aluminium oxide to TTZ, i.e. the composites of alumina and partially stabilised zirconia (PSZ) exhibit improved toughness, enhanced thermal shock resistance and hardness. The alumina and PSZ composite ceramic tools exhibit cutting performance better than TTZ tools and comparable to zirconia toughened alumina tools. 相似文献
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《Ceramics International》2022,48(10):13695-13705
The Al2O3-WC-TiC-graphene composite ceramic tool (AWTG0.5) fabricated by two-step hot pressing was used to continuously turn the hardened 40Cr steel at different cutting speeds, and its cutting performance and wear mechanisms were compared with the homemade graphene-free AWTG0 ceramic tool and the commercial ceramic tools SG4 and LT55. The cutting performance of the AWTG0.5 tool was significantly better than that of the AWTG0, SG4 and LT55 tools. The contributions of graphene to the mechanical properties, lubricating properties and thermal conductivity of the AWTG0.5 tool were responsible for its higher cutting performance. The main wear mechanisms of the AWTG0.5 tool were adhesive wear and abrasive wear. In addition, it was also found that the anti-friction and wear resistance performances of the AWTG0.5 tool were superior to those of the other three tools. Its good anti-friction and wear resistance performances could be attributed to the formation of a self-lubricating layer induced by graphene pull-out. 相似文献
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新型陶瓷材料具有高强、高硬、耐腐蚀、耐高温等特性。近些年来,在开发新能源和有效利用石油能源的呼声中,发达国家相继掀起了新型陶瓷材料研究开发的热潮。针对新型陶瓷材料的独特性能,综述了工程陶瓷材料用途广泛和特殊性能的功能陶瓷材料广阔应用前景;以及陶瓷基复合材料具有广泛的发展趋势;介绍了广泛应用于工程领域的陶瓷阀门材料和切削性能优良的新型陶瓷刀具;同时指出了陶瓷材料产业的应用开发趋势。 相似文献
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新型陶瓷材料具有高强度、高硬度、耐腐蚀、耐高温等特性。近些年来,在开发新能源和有效利用石油能源的呼声中,发达国家相继掀起了新型陶瓷材料研究开发的热潮。针对新型陶瓷材料的独特性能,综述了工程陶瓷材料用途广泛和功能陶瓷材料的应用前景,以及陶瓷基复合材料的发展趋势;介绍了广泛应用于工程领域的陶瓷阀门材料和切削性能优良的新型陶瓷刀具,同时指出了陶瓷材料产业的应用开发趋势。 相似文献
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Guy Annéa Kim Vanmeenselb Jef Vleugelsc Omer Van der Biestd 《陶瓷学报》2005,26(3):177-182
许多材料在医学领域应用广泛,例如,整体替换硬组织或软组织的元件(如骨盆、骨头、关节、植牙等)、修补、诊断或矫正仪器(如起搏器、心脏阀等)。这些材料不仅要有好的力学性能,还要保持长期稳定,不能与人体相排斥。由于陶瓷材料在生理环境中具有强度高、生物相容性强和稳定性好的优点,人们研究用陶瓷材料替换骨骼。从20 世纪70 年代起,欧洲人用陶瓷组件置换整个髋关节。这些组件主要由氧化铝和氧化锆单体制成。然而,在有水环境中,氧化锆会发生低温降解。目前人们的研究重点在于提高陶瓷组件的强度和耐磨性,同时缩小其尺寸并延长其使用寿命。研究中使用的材料是氧化锆增韧的氧化铝复合陶瓷和其它氧化铝复合陶瓷,不再是单体陶瓷。另外,还可以使用氧化铝和氧化锆功能梯度复合材料。该梯度材料可以利用电泳沉积法(EPD)制得,其表面为纯氧化铝,中心部分为均匀的氧化铝、氧化锆复合材料,中间过渡部分是呈连续梯度渐变的氧化铝、氧化锆复合材料,烧成后会产生剩余热应力。设计这样的梯度结构是为了使复合材料具有最大表面压应力和最小内部张应力,与纯氧化铝组件相比,提高了强度和耐磨性。 相似文献
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Da-Wang Tan Wei-Ming Guo Hong-Jian Wang Hua-Tay Lin Cheng-Yong Wang 《Ceramics International》2018,44(13):15495-15502
TiB2–20vol%B4C (TB20) and TiB2–80vol%B4C (TB80) ceramic cutting tool materials were prepared by hot pressing, and then tested in turning of Ti6Al4V alloy with various cutting parameters. The tool life and wear mechanism of TB20 and TB80 were studied and compared with a commercial grade tungsten carbide tool (WO). The results of turning showed that effective cutting length of TB20 was about one third longer than that of TB80 and WO. Among the three tools, the increment of cutting temperature measured for TB20 was the lowest as flank wear increased from 0 to 600?µm. Analysis showed that dominant wear mechanism was adhesive wear in all of the three tools tested, while chipping was also observed in TB80 and temperature deterioration in WO. In addition, the TB20 exhibited a much better integrity of cutting edge after flank wear reaching 600?µm, due to its higher toughness than TB80 and higher thermal resistance than WO, respectively. The adhesive layers of work-piece material on the rake and flank faces of both TB20 and TB80 were much thinner than that of WO, which suggested a lower adhesive wear rate in TiB2-B4C cutting tools. The high wear resistance of TiB2-B4C cutting tools is attributed to higher thermal resistance, higher hardness, and lower chemical affinity with titanium as compared with tungsten carbides, which makes them very promising materials for high speed machining of titanium alloys. 相似文献
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《Ceramics International》2019,45(12):14555-14561
Processing metallic powders by electrical resistance sintering requires the use of insulating ceramics dies. Selecting the appropriate ceramic material according to the electrical, thermal and mechanical properties is a need. Dies produced with several ceramic materials have been tested during the production of cemented carbide in order to check their behaviour in the process and final product properties. Tialite/mullite, zircon/mullite, zirconium phosphate based ceramic, yttria-stabilized zirconia and sialon, in most cases with modified compositions and shaping processes in order to achieve a high density, have been tested. Dry powder processing by cold isostatic pressing and furnace sintering resulted to be the better process for dies production. The effect of die properties on the produced cemented carbide, and the behaviour and life of the die during the production have been analysed. Very smooth die surface increases the number of cycles withstood during metallic parts production, because of lower extraction stresses, as checked for sialon dies. Zirconium phosphate based dies, with low thermal conductivity, show the most densified hard metal parts surface. 相似文献