阻力型垂直轴风力发电机组的优化设计

传统的阻力型垂直轴风电机组的起动性能不佳、风能利用率不高、抗强风能力不足。样机实验表明,通过优化风轮结构,增设多功能风轮屏障结构,改善电气系统等措施,阻力型垂直轴风电机组的综合性能得到了针对性的改善。其落地成为便携式的小功率风电机组产品,可广泛应用于远离城乡的移动牧场、宿营地、临时勘测点等小功率用电场合,前景广阔。

石墨烯增强钛基复合材料的热等静压研究

以TC4钛合金球形粉和石墨烯纳米片为原料,通过低温高能球磨使石墨烯均匀分散于钛合金粉末基体上,采用热等静压工艺使复合材料烧结致密.研究了热等静压温度对复合材料显微组织、力学性能和热导率的影响.结果表明:随着热等静压温度的升高,材料的拉伸强度降低,而塑性提高,900℃热等静压时热导率取得最大值;与未添加石墨烯的纯钛合金相比,复合材料强度和热导率提高而塑性大幅度下降.

刀剪用马氏体不锈钢的现状和发展

采用马氏体不锈钢制造的刀剪具有硬度高、韧性好、耐磨和耐蚀等优点。介绍了刀剪用马氏体不锈钢的分类,日本爱知钢铁公司、美国坩埚工业公司和国内阳江十八子精密特钢公司生产的刀剪用马氏体不锈钢的化学成分,碳和铬、锰、硅、钼、铌、钨、钒等合金元素在钢中的作用,刀剪用马氏体不锈钢的生产工艺、热处理工艺对其性能的影响以及发展趋势。

Ti和B含量对X100管线钢用埋弧焊熔敷金属冲击韧性的影响

研究了不同Ti和B元素含量对自主研发的X100管线钢用埋弧焊焊丝和高碱度焊剂匹配焊接所得熔敷金属冲击性能的影响。结果表明,B元素含量小于0.0006%、Ti元素含量小于0.015%时,增加Ti和B元素,都有助于提高熔敷金属的冲击韧性;在B元素含量为0.0006%、Ti元素含量为0.015%时,熔敷金属冲击吸收能量-60℃达到最大值(101J)。B元素含量在0.0006%~0.001%之间,随着Ti,B元素含量的增加,熔敷金属冲击韧性都下降;B元素含量超过0.001%后,随着Ti含量的增加,熔敷金属冲击韧性快速降低。

Fabrication of in-situ synthesized ceramic reinforced Ni-based alloy composite coatings by reactive braze coating processing

In-situ synthesized ceramic such as TiC,Cr7C3 and Cr5B3 reinforced Ni-based alloy composite coating was fabricated on the surface of mild steel substrate by reactive braze coating processing with colloidal graphite,Cr,Ni,ferro-boron,Si and titanium powders as the raw materials at low temperature of 1000℃,and a new kind of coating materials was developed.By means of SEM,EDS,XRD and surface hardness tester,the microstructures,phases,hardness and wear-resistance of the coating were analyzed,respectively.The results revealed that the coating was mainly composed of the ceramic in-situ synthesized reinforcement phases of TiC,Cr7C3 and Cr5B3 and the binder phases in-situ synthesized of Ni31Si12 and(Ni,Fe)solid solution;The ceramic reinforcement phases of TiC,Cr7C3 and Cr5B3 were randomly distributed in the binder phases of Ni31Si12 and(Ni,Fe)solid solution;The coating had about 15vol%pores and can possibly be applied as a self-lubrication coating;The coating and the substrate were integrated together by metallurgical bonding;The coating had a hardness up to 91-94HR15N.

φ175特大顶锤解剖分析及试样热等静压工艺研究

对市售的大尺寸硬质合金顶锤进行解剖,观察和分析了试样的显微结构和性能。实验表明解剖的低压烧结顶锤的显微组织均匀性较差,力学性能不稳定。对顶锤解剖试样在不同温度下进行了热等静压处理,结果表明,接近低压烧结温度的热等静压处理会恶化材料的性能,而随着处理温度的降低,材料的横向断裂强度逐渐增加,1340℃处理后的强度超过原来顶锤的强度,提高率10%以上,而硬度值变化很小,材料显微结构中硬质相和粘结相分布趋于均匀。合适的热等静压处理工艺有利于顶锤性能的提高,从而延长顶锤的使用寿命。