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国家自然科学基金(51271060)

作品数:12 被引量:19H指数:2
相关作者:郑立允赵立新程凯孟国营白帆更多>>
相关机构:河北工程大学钢铁研究总院中国矿业大学(北京)更多>>
发文基金:国家自然科学基金河北省杰出青年科学基金国家重点基础研究发展计划更多>>
相关领域:一般工业技术金属学及工艺电气工程理学更多>>

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12 条 记 录,以下是 1-10
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新型射孔枪管用钢的组织和性能被引量:1
2016年
研究了亚温淬火工艺和原始组织对一种新型射孔枪管用钢组织和性能的影响。结果表明,随亚温淬火温度升高,试验钢的晶粒增大,硬度呈先增大后降低的趋势;随回火温度升高,钢的硬度和强度逐渐降低,断面收缩率和冲击吸收能量逐渐增大;经分析最佳热处理工艺为840℃亚温淬火+560℃回火,以此工艺下处理后调质态试验钢的综合力学性能最优。
郑立允甄凌雪王锦永刘静张亚彬王黎辉
关键词:亚温淬火回火力学性能
添加CaF_2对烧结稀土永磁体性能的影响被引量:1
2013年
用添加CaF2的方法制备了烧结Nd-Fe-B和烧结Sm-Co复合磁体,并对磁体的性能进行了分析研究。实验结果表明:在添加CaF2的烧结Nd-Fe-B复合磁体的电阻率增大,但其磁性能有一定程度的下降;而添加CaF2的烧结Sm-Co复合磁体,由于制备工艺过程中的氧化问题,导致磁体的磁性能严重下降。扫描电镜分析表明,烧结Sm-Co/CaF2复合磁体中没有形成1:5相和2:17R相的微观组织;在烧结Nd-Fe-B/CaF2复合磁体中,CaF2只存在于晶界富Nd相中,对磁体的微观组织没有太大的影响,烧结Nd-Fe-B磁体适合用添加CaF2的方法制备高电阻率的复合磁体。
毕文超郑立允赵立新李岩峰孙威
关键词:CAF2ND-FE-B磁体电阻率
分散的Sm-Co永磁纳米颗粒的机械化学合成及磁性能被引量:1
2013年
通过机械化学合成方法制备了矫顽力分别为2.95×106、2.83×106和8.60×105 A/m的分散的单晶纳米Sm2Co7、SmCo5和Sm2Co17硬磁颗粒。研究了球磨时间、原料配比和退火工艺等对所制备的纳米永磁颗粒的微观组织、结构和磁性能的影响。结果表明,机械化学球磨时间至少是4h或更长时间才能获得Sm-Co硬磁合金粉末。原料经过高能球磨后、未退火时,由于大部分颗粒为非晶结构,矫顽力较低,随着退火温度的上升,矫顽力增大,当退火温度为600℃时,达到最大值为2.83×106 A/m,然后,随着退火温度的进一步升高,矫顽力减小。Sm-Co纳米颗粒的粒径随着退火温度的降低而明显减小。
赵立新孟国营郑立允
关键词:磁性能
纳米晶Sm_2Fe_(17)片的制备及低温渗氮
2013年
采用油胺作为表面活性剂,将Sm2Fe17微米粉进行表面活性剂辅助高能球磨(HEBM)4 h后,获得厚100~180 nm,长2~13μm的纳米片,该纳米片具有织构,晶粒尺寸约8 nm。在300~350℃低温范围内,进行低压、短时渗氮,获得Sm2Fe17N3片状粉末。Sm2Fe17纳米片在350℃、3 psi氮气压力下渗氮3 h后,矫顽力可达到3.56 kOe,晶粒保持纳米尺度不变,且具有(001)织构。
赵立新孟国营郑立允
关键词:纳米晶
Relationship between controllable preparation and microstructure of NdFeB sintered magnets被引量:5
2014年
The double hard magnetic phase magnets with nominal compositions of Nd30–xDyxFe69B1(x=2, and 4)(wt.%) were prepared. The magnetic properties of the magnets were measured with a NIM-2000H hysteresigraph. The crystalline structures of the magnets were identified by X-ray diffraction(XRD). The Rietveld refinement was carried out using the FULLPROF software. The scanning electron microscopy(SEM) and transmission electron microscopy(TEM) analyses were carried out in order to investigate the microstructure of the magnets. It showed that the magnets consisted mainly of Nd2Fe14 B phase, and some Nd-rich phase. Two types of matrix-phase grains in dark grey and light grey were found in the magnets with x=2 and 4. The Dy content was obviously different in the two types of grains, which proved that the double hard magnetic phases(Dy-rich and Dy-lean phases) coexisted in the magnet. It revealed that the Nd-rich phases in junction regions had fcc structure, with the unit cell parameter of about 0.52–0.56 nm. The weak superlattice spots were found in the SAD patterns of the junction Nd-rich phases with large scale. The double hard magnetic phase structure seemed to improve the magnetic properties of NdFeB magnets with high coercivity, while decrease the consumption of Dy element, compared with the single alloy magnet.
李岩峰朱明刚李安华冯海波黄书林李卫杜安齐岩
关键词:COERCIVITY
Microstructure and magnetic properties of anisotropic hot-deformed magnet of different magnetic particle sizes被引量:5
2015年
In this paper, the magnetic Nd-Fe-B particles of different sizes were conducted under vacuum by the hot pressing, then cooled quickly to room temperature. Finally hot deformation was performed to get the anisotropy Nd-Fe- B magnet at a deformation rate of 70 % in the protection of argon atmosphere. NIM-2000 was used for the measurement of hysteresis loop of the samples. Meanwhile, scanning electron microscopy (SEM) was used to observe the surface morphology of the magnetic particles with different sizes and hot-deformed magnets, energy spectrum analyzer to analyze the composition of magnetic particles. The effect of magnetic particle sizes on the microstructure and magnetic properties of the hot-deformed anisotropic magnet was investigated. Anisotropic hot-deformed magnets produced from the maximum particle size of 200-350 μm have the highest magnetic properties of Br = 1.465 T, Hcj = 1,157 kA.m-1, (Bn)max = 425 kJ.m-3.
Xu-Chao WangMing-Gang ZhuWei LiYan-Feng LiBin LaiAn Du
关键词:SIZE
新型光催化剂BiOI的制备及其光催化性能被引量:1
2017年
采用水热法和溶剂热法制备了两种不同结构的光催化剂BiOI,通过X-射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等技术对其晶相结构、微观形貌进行了表征,并模拟太阳光下降解甲基橙(MO)来评价所制备样品的催化性能。光催化实验表明,可见光下溶剂热法所制备的光催化剂明显优于水热法合成的催化剂以及商品光催化剂P25,在80 min内对甲基橙溶液的催化降解率达90%以上,同时在紫外光下依然具有很高的活性。分析其降解机理可知,光催化降解过程是光生电子与空穴同时作用的结果。
郑立允王书岭
关键词:光催化催化降解光降解反应
旋压车载CNG气瓶封头底部裂纹形成原因分析被引量:2
2016年
采用热旋压工艺将30Cr Mo无缝钢管成形为气瓶后,在气瓶封头底部熔合处出现裂纹,严重影响了气瓶质量。本文通过金相、扫描电镜、能谱分析等方法,对气瓶裂纹部位进行了金相组织观察及夹杂物分析。结果发现,裂纹周边出现大量脱碳铁素体,强度较低,且铁素体晶粒粗大,组织中伴有混晶,形变时受晶界影响的区域相对缩小,大尺寸晶粒间易造成应力集中,导致裂纹产生。裂纹周围还存在大量氧化夹杂物,破坏了母体金属的连续性,降低了材料塑性,如果这时局部塑变过大,超过微区塑变极限,就会形成微裂纹,并进一步扩展为宏观裂纹。
程凯郑立允张荣晓武常生陈杰李方威刘静
关键词:旋压混晶氧化夹杂
热压/热变形(Nd,Ce)_2Fe_(14)B/CaF_2磁体的磁电性能和微结构被引量:2
2016年
通过热压/热变形工艺制备了掺杂Ca F2的(Nd1-xCex)29FebalB0.9M(x=0.1,0.15,0.2,0.3,M=Co和Ga等)磁体,研究发现随Ca F2掺杂量增加,电阻率逐渐升高,磁性能逐渐下降。当Ca F2添加量为3wt%时,随Ce取代量的增加,矫顽力呈先上升后下降的趋势。当Ca F2掺杂量为3%,Ce含量x=0.15时,性能最优,剩磁为11.26k G,磁能积为21.93 MGOe,矫顽力达到最大值9.49 k Oe,电阻率达到269μ?·cm,与无掺杂Ca F2热压/热变形工艺制备的钕铁硼磁体电阻率230μ?·cm相比提高了13%。通过对热压/热变形磁体中Ca F2添加量和Ce含量的优化,提供了一种较高电阻率、低成本高磁性能的(Nd1-xCex)29FebalB0.9M热压/热变形磁体。
白帆郑立允朱明刚李卫
关键词:磁性能
Relation between microstructure and magnetic properties of shock wave-compressed Nd-Fe-B magnets
2022年
The relationship between the microstructure and magnetic properties of Nd-Fe-B sintered magnet compressed by shock wave with 6.26 GPa≤p≤7.16 GPa was investigated.It reveals that Nd-Fe-B magnets show a demagnetization behavior after compressed by shock wave.The intergranular fracture is the main occurring phe-nomenon in the shock wave-compressed magnets.The coercivity of the shock wave-compressed Nd-Fe-B magnets could be recovered after repeating the annealing process.It suggests that only the morphology change just like the intergranular fracture occurs,and there is no structural change in the grain boundary phase in the shock wave-compressed magnet.Matrix phase grain interconnection,microcracks and pores,and alterant orientation relationship between matrix phase and grain boundaries phase are con-sidered as induced factors of demagnetization.
Ming-Gang ZhuYan-Feng LiWei LiLi-Yun ZhengDong ZhouHai-Bo FengLang ChenAn Du
关键词:COERCIVITYDEMAGNETIZATION
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