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国家自然科学基金(51202296)

作品数:15 被引量:87H指数:5
相关作者:王小锋彭超群王日初张斗王志勇更多>>
相关机构:中南大学更多>>
发文基金:国家自然科学基金国家教育部博士点基金中国博士后科学基金更多>>
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15 条 记 录,以下是 1-10
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Rheological property and drying mechanism of thermoresponsive gelcasting of ZnO
2015年
To solve the problem of drying gelcast green body, the thermoresponsive gel system which contains macromonomer graft chains was used in gelcasting of ZnO. The effects of the amount and length of graft chains macromonomer PIPAAm, the total amount of organic matters, and the solid loading on the rheological properties of suspensions were investigated, and the drying mechanism of gelcast green body was analyzed. The results show that ZnO suspensions with the gel system still display shear- thinning rheological behavior, but its viscosity increases with increasing the addition amount and relative molecular mass of PIPAAm graft chain, and the total organic matter content. The PIPAAm graft chains inhibit or even eliminate the formation of the "dense layer” on the surface of gelcast ZnO green bodies, and accelerate the drying of green bodies. The introduction of PIPAAm graft chains facilitates the shrinkage of the gelcast ZnO green bodies, which is a feasible method to increase the relative density of green bodies.
王小锋王日初彭超群孙文燕孙月花
关键词:ZNOZNOGELCASTINGN-ISOPROPYLACRYLAMIDE
Liquid drying of BeO gelcast green bodies using ethanol as liquid desiccant
2015年
BeO gelcast green bodies were dried by liquid drying method with liquid desiccant ethanol.Effects of ethanol concentration,solids loading and aspect ratio of green body on the moisture and shrinkage of green bodies were studied through measuring mass and dimension.Additionally,liquid drying stress was analyzed and a model of the initial stage drying stress was established.The results show that higher ethanol concentration,lower solids loading and higher aspect ratio of gelcast green bodies increase the drying rate.Increasing the ethanol concentration decreases the shrinkage rate.Liquid drying stress is generated due to a non-uniform drying rate.During the process of liquid drying,the inner drying stress of the green body changes from compressive stress to tensile stress,while the outer drying stress changes from tensile stress to compressive stress.
王小锋彭超群王日初孙月花陈以心
关键词:BEOGELCASTINGETHANOL
Rheological behavior of ZnO suspension with thermosensitive poly(N-isopropylacrylamide) for colloidal processing of ceramics
2016年
Novel colloidal processing using thermosensitive poly(N-isopropylacrylamide) (PNIPAM) as a coagulating agent has beendeveloped to prepare complex-shaped ceramic components. In this work, the properties of PNIPAM aqueous solutions and therheological behavior of ZnO suspensions with PNIPAM were investigated. The results show that the PNIPAM solutions exhibitobvious thermosensitivity and its transition temperature is around 32℃. When the temperature is above 40℃ (Tc, the criticaltransition temperature of thermosensitive suspension), the 50% ZnO (volume fraction) suspension with 8 mg/mL PNIPAM has asharp increase in viscosity and reaches up to 11.49 Pa·s at 50℃, displaying strong elasticity. The main reasons are the increase ofeffective volume fraction attributed to precipitation of PNIPAM segments and the flocculation between ZnO powder particles. Inaddition, the maximum solid loading (volume fraction) at 20 ℃ is higher than that at 40℃, which proves that the phase transition ofPNIPAM can induce the flocculation of suspension.
孙月花彭超群王小锋王日初冯艳王乃光
关键词:ZNOTHERMOSENSITIVITY
HEMA-TBA凝胶体系制备多孔氧化铝陶瓷被引量:5
2017年
采用HEMA-TBA凝胶体系制备具有高气孔率,高强度的多孔氧化铝陶瓷,研究多孔氧化铝陶瓷的浆料和坯体制备工艺,并系统研究了分散剂含量和固相体积分数对浆料粘度和悬浮稳定性的影响、干燥和单体含量对生坯性能的影响以及固相体积分数和烧结温度对烧结体微观结构的影响。结果表明:加入柠檬酸可以使浆料粘度降低,稳定性提高,柠檬酸加入量达到2wt%后浆料粘度和稳定性趋于稳定;固相体积分数的增加会导致浆料粘度和稳定性的增加;生坯在干燥过程中的收缩比水基体系小很多,干燥时间也相对更短;单体含量对生坯强度影响较大,当单体含量为25wt%时,生坯强度较高;通过选择不同的固相体积分数和烧结温度,可以有效地控制烧结体的微观结构,气孔率的变化范围在40%~65%,同时烧结体强度也会随之发生变化,变化范围在5.7~91.2 MPa。
谢雨洲彭超群王小锋王日初罗丰
关键词:多孔陶瓷凝胶注模流变性能
Porous alumina ceramic via gelcasting based on2-hydroxyethyl methacrylate dissolved in tert-butyl alcohol被引量:3
2019年
To obtain porous alumina ceramic with high strength,a novel gelcasting system based on 2-hydroxyethyl methacrylate(HEMA)dissolved in tert-butyl alcohol(TBA)was developed.The polymerization of the HEMA-TBA gelcasting system,the thermal behavior of obtained green body,and the microstructures and mechanical properties of the sintered bodies were investigated by rheometer,TG-DSC,SEM and bending strength testing,respectively.The results show that,(1)10 mg/mL of the initiator(benzoyl peroxide)is the optimal amount for polymerization of this gelscasting system at 25 ℃;(2)The alumina suspension of the HEMA-TBA gelcasting system showing shear-thinning behavior is sufficiently low for gelcasting process;(3)The bending strength of porous alumina ceramic samples,whose porosities range from 42% to 56%,is from(8±0.5)to(91±4.5)MPa.
Xiao-feng WANGYu-zhou XIEChao-qun PENGRi-chu WANGDou ZHANGYan FENG
关键词:GELCASTINGPOLYMERIZATIONALUMINA
直写成型技术:一种新型微纳尺度三维结构的制备方法被引量:10
2015年
直写成型技术是一种新型的无模成型技术,该技术借助计算机辅助设计和精密机械,精确控制悬浮液的沉积,通过逐层叠加的方式制备简单三维周期结构和含跨度(无支撑)或具有很大高宽比的复杂三维结构。综述直写成型技术的研究进展,阐述其基本原理并介绍成型装置,重点总结直写成型技术对悬浮液性能的要求及其应用,最后探讨该技术存在的问题及发展前景。
孙月花彭超群王小锋王日初陈以心
关键词:悬浮液
多孔SiC陶瓷的研究进展被引量:18
2015年
多孔碳化硅(SiC)陶瓷具有力学性能优异、耐腐蚀、耐高温和热导率高等优点,在冶金、化工、环保和能源等领域拥有广阔的应用前景。综述多孔SiC陶瓷的孔隙特性、力学性能和导热性能;将常用的多孔SiC陶瓷制备方法分为4类并加以阐述,即颗粒堆积烧结法、模板法、添加造孔剂法和直接发泡成形法;介绍多孔SiC陶瓷的应用;展望多孔SiC陶瓷的发展方向。
陈以心王日初王小锋彭超群孙月花
关键词:SIC多孔陶瓷
流延成型技术的研究进展被引量:22
2015年
综述流延成型的研究进展;概述流延成型工艺特点与流延成型体系;介绍流延成引发型浆料的组成及其特点;阐述流延成型的工艺流程及其原理;总结新型的流延成型工艺,如凝胶流延成型、紫外引发聚合流延成型等;探讨流延成型技术存在的问题和发展方向。
谢雨洲彭超群王小锋王日初刘家杰徐健
关键词:流延成型浆料添加剂
常压烧结法制备ZnO陶瓷靶材被引量:3
2015年
采用凝胶注模成型技术制备ZnO陶瓷坯体,并在较低温度下常压烧结后获得相对密度达98.6%、晶粒尺寸为1.35μm的陶瓷靶材,研究工艺参数对ZnO陶瓷靶材的相对密度、晶粒生长和电阻率的影响。结果表明:ZnO陶瓷靶材的相对密度随烧结温度升高而增大,在1050℃时达到最大值。适当增大升温速率或延长保温时间都有利于提高其相对密度。晶粒尺寸随升温速率的升高而减小,随保温时间的延长而增大。提高烧结温度和增加保温时间都可降低ZnO陶瓷靶材的电阻率。ZnO陶瓷靶材经1400℃烧结3 h后,获得的电阻率最小(为1.75×10-2?·cm)。
孙文燕王日初王小锋彭超群
关键词:凝胶注模常压烧结相对密度晶粒尺寸电阻率
纳米BeO粉体的二步烧结被引量:1
2014年
为拟制烧结后期的晶粒生长,采用二步烧结方法研究纳米BeO粉体的烧结。采用2个常规烧结实验确定每步烧结的温度范围之后,研究纳米BeO粉体的二步烧结工艺,通过扫描电子显微镜和图像分析软件研究烧结过程中微观组织结构的变化,采用激光导热仪测试材料的热导率,并分析纳米BeO粉体的二步烧结机制。研究结果表明:第1步的烧结温度(t1)范围为1 450℃≤t1≤1 500℃;第2步的烧结温度(t2)范围为1 300℃≤t2≤1 400℃;较合适的二步烧结工艺为:(1 450℃,1 min)+(1 400℃,25 h),该工艺下所得陶瓷的微观组织结构较均匀,致密度和热导率均较高,分别为96.6%和237 W/(m?K);在纳米BeO粉体的二步烧结过程中,晶界扩散和体扩散等利于致密化的机制起主要作用。
王小锋王日初彭超群王志勇
关键词:热导率
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