检索结果-南通市图书馆

Ti-Si-Fe合金添加量对Si_(3)N_(4)结合SiC材料结构与性能的影响

在线全文

学校读者我要写书评

暂无评论

耐火材料 2024年第4期58卷 277-283页

作者：姚路炎韩兵强张锦化柯昌明武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北武汉430081

为促进Si_(3)N_(4)结合SiC耐火材料的致密化,降低Si粉氮化温度,以SiC颗粒和细粉、Si粉为主要原料,利用从高钛型高炉渣提取的Ti-Si-Fe合金部分取代Si粉,在埋碳气氛下于1350℃反应烧结5 h,制备了Si_(3)N_(4)结合SiC耐火材料。研究了Ti-Si... 详细信息

为促进Si_(3)N_(4)结合SiC耐火材料的致密化,降低Si粉氮化温度,以SiC颗粒和细粉、Si粉为主要原料,利用从高钛型高炉渣提取的Ti-Si-Fe合金部分取代Si粉,在埋碳气氛下于1350℃反应烧结5 h,制备了Si_(3)N_(4)结合SiC耐火材料。研究了Ti-Si-Fe合金添加量(加入质量分数分别为0、1.8%、3.6%、5.4%、7.2%)对Si粉的氮化行为、材料力学性能和显微结构的影响,并探讨了氮化反应烧结机制。结果表明:1)随着Ti-Si-Fe合金添加量的增加,材料的常温力学性能和高温抗折强度明显改善,荷重软化温度均超过1700℃,Ti-Si-Fe合金添加量超过3.6%(w)后材料性能的增幅变缓;2)Ti-Si-Fe合金促进了Si粉在较低温度下的完全氮化和材料的反应烧结,Ti-Si-Fe合金中各物相及Si粉氮化反应的体积增加能够充填气孔,氮化产物改善骨料与基质、基质内部的结合状态,从而提高材料的致密化程度,改善力学性能;3)引入Ti-Si-Fe合金后,反应体系中形成了富含Ti、Si、N、Fe成分的液相,氮化物的形成除传统的VS、VLS机制外,溶解-沉淀机制在短柱状β-Si_(3)N_(4)、粒状TiN的形成中起到主导作用,交错连结的α-Si_(3)N_(4)晶须、短柱状β-Si_(3)N_(4)、粒状TiN对材料的力学性能起到增强作用。

关键词： Ti-Si-Fe合金反应烧结 Si_(3)N_(4)结合SiC耐火材料致密化溶解-沉淀

A dilute fluorine-free electrolyte design for high-voltage hybrid aqueous batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第2期77卷 180-190,I0005页

作者： Rui Lin Jiahao Chen changming ke Shi Liu Jianhui Wang School of Materials Science&Engineering Zhejiang UniversityHangzhou 310024ZhejiangChina key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024ZhejiangChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024ZhejiangChina key Laboratory for Quantum Materials of Zhejiang Province Department of PhysicsSchool of ScienceWestlake UniversityHangzhou 310030ZhejiangChina Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024ZhejiangChina

Fluorinated salts and/or high salt concentrations are usually necessary to produce protective films on the electrodes for high-voltage aqueous batteries,yet these approaches increase the cost,toxicity and reaction resistances of ***,we report a dilute fluorine-free electrolyte design to overcome this *** using the LiClO_(4) salt and polyethylene glycol dimethyl ether(PED)solvent and optimizing the LiClO_(4)/PED/H_(2)O molar ratio,we formulate a 1 mol kg^(-1)3 V-class hybrid aqueous electrolyte that enables reversible charge/discharge of 2.5 V LiMn_(2)O_(4)|Li_(4)Ti_(5)O_(12) full cell at both low(0.5C,92.4%capacity retention in 300 cycles)and high(5C,80.4%capacity retention in 2000 cycles)*** excellent performance is reached even without the generation of protective film on either anode or cathode as identified by in/ex situ *** selection of appropriate ingredients that have both high stability and strong interactions with water is critical to widen the potential window of electrolyte while suppressing parasitic reactions on the *** work suggests that expensive and toxic fluorinate salts are no longer necessary for 3 V-class aqueous electrolytes,boosting the development of low-cost,environmentally-friendly,high-power and high-energy-density aqueous batteries.

关键词： High-voltage hybrid aqueous batteries Fluorine-free electrolyte design Interphase chemistry Polyethylene glycol dimethyl ether

不同碱度渣对刚玉-尖晶石浇注料的侵蚀行为研究

在线全文

学校读者我要写书评

暂无评论

耐火材料 2024年第1期58卷 13-18页

作者：杨宗源王景然王桐张锦化韩兵强倪月娥柯昌明武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北武汉430081

浇注料的抗渣侵蚀性能与钢渣的碱度密切相关。以烧结刚玉、缺陷尖晶石微粉、活性α-Al_(2)O_(3)微粉、电熔镁砂细粉和铝酸钙水泥(Secar71)为主要原料,制备了刚玉-尖晶石浇注料,采用静态坩埚法于1600℃保温3 h进行抗渣试验,并用热力学模... 详细信息

浇注料的抗渣侵蚀性能与钢渣的碱度密切相关。以烧结刚玉、缺陷尖晶石微粉、活性α-Al_(2)O_(3)微粉、电熔镁砂细粉和铝酸钙水泥(Secar71)为主要原料,制备了刚玉-尖晶石浇注料,采用静态坩埚法于1600℃保温3 h进行抗渣试验,并用热力学模拟计算了液相量和液相组成,研究了刚玉-尖晶石浇注料对3种不同碱度渣(1.6、2.3和7.6)的抗渣侵蚀性能。结果表明:刚玉-尖晶石浇注料在高碱度渣中溶解能力有限,在熔渣-耐火材料界面极易形成尖晶石固溶体和六铝酸钙等高熔点物相,形成致密层阻挡熔渣渗透和侵蚀。而其在低碱度渣中溶解度较高,在浇注料-熔渣达到较高反应程度时,才开始形成尖晶石固溶体和六铝酸钙等高温相,无法形成有效的致密层阻止熔渣对浇注料的侵蚀和渗透。因此,刚玉-尖晶石浇注料对高碱度渣抗渣侵蚀能力较强,对低碱度渣抗渣侵蚀能力较弱。

关键词：刚玉-尖晶石浇注料碱度抗渣侵蚀性能热力学模拟

Synthesis of MgAl_2O_4 Powder in KCI-LiCl-KF System Molten Salt

在线全文

学校读者我要写书评

暂无评论

China's Refractories 2011年第2期20卷 16-20页

作者： ke changming GAN Lin School of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China

Molten salt synthesis of MgAl204 powder from industrial alumina and light calcined MgO in KCl, LiCl, and KCl- LiCl media, and the influence of KF at 500 -1 000℃ were investigated. Synthesized powders were characterized by means of XRD, laser particle analyzer, and SEM, and the synthesis mechanism of MgAl2O4 was discussed as well. The results show that （1） the molten salt composite （ KCl - LiCl） is more .[hvorable for the synthesis of MgAl2O4 than single molten salt （LiCl or KCl）, and LiCl is more favorable than KCl; （2） KF can accelerate the formation of MgAl2O 4 and decrease its forming temperature ; （ 3 ） synthesis of MgAl204 powder in the molten salts without KF is controlled by ＂template -growth＂ mechanism, but in the molten salts with KF , it is controlled by ＂template - growth＂ and ＂dissolution -precipitation＂ mechanism.

关键词： Magnesium aluminate spinel Molten saltsynthesis Potassium chloride Lithium chloride Po-tassium fluoride

MgO-CaO-TiO_2系材料的烧结性能及抗水化性能

在线全文

学校读者我要写书评

暂无评论

耐火材料 2005年第1期39卷 36-40页

作者：柯昌明李楠武汉科技大学高温陶瓷与耐火材料湖北省重点实验室武汉430081

以白云石、工业钛白粉、轻烧镁砂为原料配制了不同组成的MgO-CaO-TiO2材料,分别于1500℃、1550℃、1600℃、1650℃保温3 h煅烧后,研究了材料的烧结性能,并采用蒸压法(0.1 MPa下蒸压2 h)研究了烧后试样的抗水化性能.研究结果表明:1550～1... 详细信息

以白云石、工业钛白粉、轻烧镁砂为原料配制了不同组成的MgO-CaO-TiO2材料,分别于1500℃、1550℃、1600℃、1650℃保温3 h煅烧后,研究了材料的烧结性能,并采用蒸压法(0.1 MPa下蒸压2 h)研究了烧后试样的抗水化性能.研究结果表明:1550～1600℃煅烧后,试样均达到了良好的烧结,相对密度达到92%以上,原始配料中的CaO全部转化成了不易水化的CaO·TiO2,因而所有试样均表现出优良的抗水化性能.

关键词：抗水化性能烧结性能煅烧 TiO2 试样白云石镁砂配料钛白粉

Effect of Metallic Zn Powder on Oxidation Resistance of Al_2O_3-C Refractories

在线全文

学校读者我要写书评

暂无评论

China's Refractories 2006年第4期15卷 29-33页

作者： LI Youqi ke changming LI Yousheng LI Nan The Hubei Province key Laboratory of Ceramic and Refractories Wuhan University of Science and Technology Wuhan 430081 China

Al2O3-C specimens were prepared by using tabular corundum, flaky graphite, Al, Si, and Zn powder as starting materials and phenolic formaldehyde resin as binder. keeping the mass ratios of tabular corundum, flaky graphite, Al and Si constant, different contents of Zn （0,0. 5%, 1%, 2% and 3% ） were added respectively. The specimens were/teat treated at 120 -220℃ for 24h, and then fired at 1400℃ for 3h in air atmosphere. The mass change rate, thickness of decarburization layer, apparent porosity, bulk density and microstructure of the products were determined and observed by means of SEM and EDX. The results show that the specimen with 2% Zn was characterized by minimum in thickness of decarburization layer and in apparent porosity and maximum in bulk density. Consequently, the specimen with 2% metal Zn is supposed to perform the best oxidation resistance.

关键词： Corrosion mechanism MgO-CaO Refractory Antioxidant Oxidation resistance

Rheological and Sintering Properties of Two Kinds of Corundum-spinel Micropowders

在线全文

学校读者我要写书评

暂无评论

China's Refractories 2022年第4期31卷 7-11页

作者： WANG Jingran CHEN Xinming ke changming ZHANG Jinhua LIU Xuexin LI Wen The State key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Hubei Smile New Material Co. Ltd.Hong’an 438400China

For the proper use of micropowders in castables,slurries and fired samples were prepared with two kinds of corundumspinel micropowders(D and G).The effects of the solid content and disperser WSM-R1 on the rheological properties of the slurries were *** sintering properties and the slag corrosion resistance of the fired samples were also *** results show that:the slurries all show pseudoplastic rheological *** the same solid content,the slurry with micropowder G has higher initial viscosity than that with micropowder *** WSM-R1 significantly reduces the initial viscosity of the two slurries and plays a more obvious dispersing effect on the slurry with micropowder *** fired sample with micropowder G has higher bulk density,lower apparent porosity and better corrosion resistance than that with micropowder D.

关键词： corundum-spinel micropowder rheological property sintering property slag corrosion resistance

在线全文

学校读者我要写书评

暂无评论

再生中间包永久衬浇注料的研制

耐火材料 2008年第2期42卷 130-132页

作者：孙枫柯昌明武汉科技大学耐火材料与高温陶瓷湖北省重点实验室

为了对用后废弃中间包浇注料进行回收利用，首先对其进行拣选、除杂、破碎、轮碾处理等工序制成合格的回收颗粒料，然后以70％的这种回收颗粒料（粒度分别为10～5mm、5～3mm和3～1mm）和30％的特级矾土粉、水泥、膨胀剂等制成了再生中... 详细信息

为了对用后废弃中间包浇注料进行回收利用，首先对其进行拣选、除杂、破碎、轮碾处理等工序制成合格的回收颗粒料，然后以70％的这种回收颗粒料（粒度分别为10～5mm、5～3mm和3～1mm）和30％的特级矾土粉、水泥、膨胀剂等制成了再生中间包永久衬浇注料。研制的再生中间包浇注料的体积密度、显气孔率、常温强度和抗热震性等性能指标均好于原中间包浇注料的，仅1450℃烧后线变化率与原浇注料相差不大。

关键词：铝硅质浇注料中间包永久衬回收料

在线全文

学校读者我要写书评

暂无评论

含碳耐火材料的防氧化方法

耐火材料 2006年第2期40卷 133-135,142页

作者：李新健柯昌明李楠武汉科技大学高温陶瓷与耐火材料湖北省重点实验室武汉430081

结合含碳耐火材料的抗氧化要求,对添加抗氧化剂技术、表面浸渍抑制氧化法与抗氧化涂层技术及其作用机理进行了综合介绍,并在此基础上对含碳耐火材料防氧化技术的研究方向提出了一些见解。

关键词：含碳耐火材料抗氧化性防氧化剂涂层技术表面浸渍技术