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Structure modification and recovery of amorphous Fe73.5Si13.5B9Nb3Cu1 magnetic ribbons after autoclave treatment:SAXS and thermodynamic analysisL.Y.Guo1,X.Wang1,K.C.Shen1,K.B.Kim2,S.Lan3,X.L.Wang4,W... autoclave treatment at 100°C and 150°C(R1 and R2) have been systematically studied by various techniques. With increasing autoclave treatment temperature,the measured structural, kinetic and magnetic......
Leaching of a copper flotation concentrate with ammonium persulfate in an autoclave systemM.Deniz Turan1,H.Soner Altundogan21. Department of Metallurgical and Materials Engineering, Firat University2...) in an autoclave system. The decomposition products of APS, active oxygen, and acidic medium were used to extract metals from the concentrate. Leaching experiments were performed to compare......
EFFECTS OF BRUCITE COEXISTENT WITH CALCIUM SILICATE HYDRATE ON AUTOCLAVE EXPANSION OF CEMENT钱光人摘 要:<正>Effects of brucite phase coexistent with cal-cium silicate hydrate on the expansion are investigated. Tober-morite phase is presented along with brucite at 2MPa;boththe formation of Mg-substituted calcium silicate hydrate andthe vanishing......
Relationship between Structural Characteristics of Fly Ash and Reactivity under Autoclave Curing柯昌君摘 要:<正>The reactivity of autoclaved materials is conventionally estimated by their chemical composition. In this paper, after determining the chemical composition of various types of fly ash, a series of new tests which included X-ray Diffraction......
Variation law of gas holdup in an autoclave during the pressure leaching process by using a mixed-flow agitatorLei Tian1,2,Yan Liu1,Jun-jie Tang1,Guo-zhi Lü1,Ting-an Zhang11. Key Laboratory... is essential for the gas–liquid–solid phase reaction and the extraction rate of valuable metals. In this paper, a transparent quartz autoclave, a six blades disc turbine-type agitator, and a high......
热压罐工艺的成型压力对框架式模具温度场的影响 梁宪珠1,王永贵1 (1.北京航空制造工程研究所飞机工艺研究室,北京,100024) 摘要:从理论分析入手,结合工程实验研究了在热压罐工艺中成型压力改善框架式模具温度场分布的均匀性和缩短热历程升温阶段时间. 关键词:热压罐工艺; 成型压力; 框架式模具; 温度场; autoclave technics; molding pressure; frame tooling; temperature field; [全文内容正在添加中] ......
; composites; autoclave; co-bonding; stiffened skins; resin flow; fiber compaction; [全文内容正在添加中] ......
热压罐成型变厚度层板缺陷研究 张佐光1,李敏1,顾轶卓1,邓火英1 (1.北京航空航天大学材料科学与工程学院,北京,100083;2.航天材料及工艺研究所,北京,100076) 摘要:以S-2玻璃纤维/环氧648变厚度层板为研究对象,采用热压罐工艺成型,考察了不同铺层方式和阶梯宽度下缺陷的形成情况.研究结果表明,由于厚度梯度的存在,层板中容易产生纤维分布不均,富树脂,孔隙和分层缺陷,这与树脂的二维流动,纤维的滑移和结构的不对称性有关,铺层方式对各种缺陷影响显著.变厚度层板成型过程中倾角减小使得尺寸难以预测和控制,成型过程中应尽量避免树脂的流动. 关键词:复合材料; 热压罐成型; 变厚度......
变厚度复合材料热压罐工艺层板厚度控制的实验研究 辛朝波1,张佐光1,李敏1,顾轶卓1,马晓东1,孙志杰1 (1.北京航空航天大学,材料科学与工程学院,空天材料与服役教育部重点实验室,北京,100191) 摘要:针对2种碳纤维织物/环氧预浸料,采用热压罐工艺在不同条件下制备了变厚度层板,并通过层板内部形貌,层板厚度,纤维含量,吸胶量,织物渗透率的测试分析,研究了变厚度层板的密实过程和纤维分布的影响因素.结果表明:密实过程中树脂的二维流动导致2种织物变厚度层板厚板区的纤维含量高于薄板区;G0827单向织物的面内渗透率与厚度方向渗透率比值大于G0803缎纹织物,造成G0827织物变厚度层板的纤......
L形复合材料层板热压工艺密实变形过程的数值模拟 李艳霞1,顾轶卓1,张佐光1,李敏1 (1.北京航空航天大学,材料科学与工程学院,北京,100083) 摘要:基于Biot固结原理和达西定律,建立了二维树脂流动与纤维密实模型,采用有限元方法实现了L形层板热压成型过程树脂压力分布,层板变形的预测.通过对AS4炭纤维/环氧3501-6等厚层板厚度变化的模拟结果与实验数据的对比分析,证明了数学模型和有限元程序的可靠性.以阳模成型90°铺层S-2玻璃纤维/环氧648L形层板为例,对工艺过程层板厚度变化进行了分析.模拟结果表明:剪切模量对拐角以及拐角与平板过渡区域的变形影响较大;平板长度对拐角区域变......
