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of about 33.3% (mole fraction) according to Mo-Si-Al ternary phase diagram at 1550 °C in Fig. 2 [13]. This characteristic of wide content range of Al makes it possible to synthesize C40 structured Mo... (corresponding compositions were marked with dotted lines in Fig. 2). This molar ratio was identical with the stoichiometric ratio of Mo(Si0.6, Al0.4)2. Fig. 2 Mo-Si-Al ternary phase diagram at 1550 °C......
) Ag0.90Si0.10-Au; (c) Au0.50- Si0.50-Ag, Au0.60Si0.40-Ag and Au0.80Si0.20-Ag Fig.8 Calculated liquidus projection of Au-Ag-Si ternary system in this work Enthalpies of mixing of the ternary... Thermodynamic description of Au-Ag-Si ternary system WANG Jiang(王 江), LIU Hua-shan(刘华山), LIU Li-bin(刘立斌), JIN Zhan-peng(金展鹏) School of Materials Science and Engineering, Central South University......
若为了去除其中的SiO2,CaO,MgO,Al2O3,加入过量的碳粉,而在分解过程中又不能使碳全部反应完毕,必然会造成最终产品中碳含量较高,或者使分解得到的Mo金属碳化,产生Mo2C或者MoC,影响钼产品质量. 4 结论 1) 在钼精矿真空冶炼过程中加入碳粉,有利于其中的杂质SiO2,CaO,MgO,Al2O3的去除.其中Si的脱除率达到了约100%,Mg的脱除率达到了约99.7... 100081) 摘 要:采用在钼精矿真空冶炼过程中添加碳粉的方法,进一步降低钼精矿真空冶炼过程中主要杂质SiO2,MgO,Al2O3和CaO的含量.热力学计算结果表明:SiO2,MgO,Al2O3和CaO均有可能与碳发生反应,生成气态物质被去除.试验研究结果表明,在钼精矿真空冶炼过程中加入碳粉可以明显降低其中Si,Mg,Al和Ca的含量,其中Si的脱除率约达到100%,Mg......
性能更优良.利用钛铁矿,在氮气气氛下通过铝热碳热原位反应合成,制备了Al2O3-TiCN-Fe复合材料.与通常的陶瓷材料一样,高硬度和高耐磨性等性能优势很明显,但是脆性高,容易断裂始终是陶瓷材料研究中面对的核心问题.本文在钛铁矿通过碳热铝热原位还原反应,采用热压工艺制备Al2O3-Ti(C,N)-Fe复合材料的基础上,添加Ni,Co和Mo金属添加剂来改善Al2O3-Ti(C,N)-Fe复合材料的性...)相颗粒的周围.这说明Mo的添加可以抑制烧结时的碳化物晶粒长大.何林等[13-14]研究发现:Mo2C在加热过程中,1 100 ℃以下与Ti(C,N)发生固态反应生成(Mo,Ti)(C,N)固溶体；1 300 ℃时Ti(C,N)和(Mo,Ti)(C,N)颗粒溶解和沉淀在Ti(C,N)周围,开始生成(Mo,Ti)(C,N)环形相,对Ti(C,N)相起到很好的包覆作用. 表4所示为不同Mo质量分数添加......
): 601-606.LI Li, LU Xiao-yu, DAI Fu-ping. Rapid solidification mechanism of Fe-Mo-Si ternary quasiperitectic alloy in drop tube[J]. Foundry Technology, 2008, 29(5): 601-606. [12] 邹欣伟, 马 勤, 贾建刚. Laves相高温结构硅..., 11(6): 947-959. [2] YAO M X, WU J B C, YICK S, XIE Y, LIU R. High temperature wear and corrosion resistance of a Laves phase strengthened Co-Mo-Cr-Si alloy[J]. Materials Science and Engineering......
Partial phase diagram of Au-Ag-Dy ternary system ZHANG Kang-hou(张康侯), CHEN Jiang(陈 江) (Kunming Institute of Precious Metals, Kunming 650221, China) Abstract: On the basis of Au-Ag, Au-Dy and Ag-Dy binary phase diagrams, the 700℃ isothermal section of Au-Ag-Dy ternary system(Dy≤35%, mole fraction) was established by X-ray diffraction analysis, differential thermal analysis and optical......
, Raman signal of SiC was detected, which suggests the existence of Si in the diamond films. Smooth fine-grained diamond (SFGD) film was synthesized at Si to C ratio of 1%. Key words: Si doping; hot... on diamond and non-diamond substrates such as Si, Cu, Mo, Al2O3 [1] and cemented carbide [2-4]. However, chemical vapor deposition (CVD) diamond films are polycrystalline and highly defective, which restricts......
于Ti2AlC的生成,而有利于Ti3AlC2的生成机理,说明了掺Si后固溶体的产生过程. 关键词:硅掺杂；放电等离子烧结；Ti2AlC/Ti3AlC2；理论分析 中图分类号:TQ 174 文献标识码:A Synthesis of Ti2AlC/Ti3AlC2with Si doping by spark plasma...层状结构,掺杂Al有助于合成Ti3SiC2高纯材料[15-16].因此,本文作者分别以摩尔比为2.0Ti/1.1Al/1.0C及不同掺Si量的混合元素粉为原料,采用放电等离子工艺合成Ti2AlC/Ti3AlC2块体材料.研究Si掺杂对以单质粉为原料用放电等离子工艺合成Ti2AlC/Ti3AlC2的影响.结合Ti-Al-C三元相图,在研究中发现,应用放电等离子工艺在1 200 ℃时能得到含二元化合物......
无压反应烧结Mo(Si,Al)2-SiC复合材料的研究 金志浩1,吕振林2,张小立1 (1.西安交通大学,材料强度国家重点实验室,陕西,西安,710049;2.西安理工大学材料学院,陕西,西安,710048) 摘要:利用MoSi2,Al,C之间的原位反应无压烧结制备了Mo(Si1-x,Alx)2-SiC复合材料.随着烧结温度从1400℃升高到1650℃,MoSi2相消失,反应产物为Mo(Si,Al)2和SiC及Mo5Si3C相.由于固溶体及Nowotny(Mo5Si3C)相的形成,使得原位反应中化学计量法则变得困难.原位生成的SiC相随着温度的升高由颗粒状变为晶须状,并由于它的强韧化作用使得复相材料的性能较单相材料成倍提高. 关键词:Mo(Si,Al)2-SiC复合材料; 渗硅; 晶须; 固溶; 强度; [全文内容正在添加中] ......
体温度高于890 °C时,TiC与Al和Si反应生成Al4C3及Ti3SiC2相.分析认为,Si之所以使TiC在铝熔体中变得不稳定,是由于铝熔体中的Si能够进入到TiC晶格中,并进一步扩散,形成夹杂有一定量Si的TiC.在此过程中,Si会在TiC中引起较大的晶格畸变作用,促进TiC中碳原子的迁移. 关键词:碳化钛；硅；铝-硅合金；稳定性 (Edited by YANG Hua... °C, TiC will react with Al and Si to form TiAlxSiy and Al4C3 phases. But if the melt temperature is above 890 °C, TiC will react with Al and Si to form to Ti3SiC2 and Al4C3. It is considered......
