Phase equilibria calculation of LaI3-MI （M=Na, K, Cs） binary systems

The Gibbs energies of liquid phases in the LaI3-MI (M=Na, K, Cs) systems were described by the modified quasi-chemical model. From the measured phase equilibrium data of these binary systems, a set of thermodynamic functions were optimized by using the CAL-PHAD technique. The enthalpy of mixing and the interaction parameter of the liquid phase were predicted from known data for the LaI3-MI systems.     

整合国际技术资源 提升高端竞争优势

杭州机床集团有限公司是一家面向全球的综合磨床供应服务商．成立于2001年12月28日．公司生产的平面磨床、成形磨床产销量位居全国榜首,被商务部授予中国最具市场竞争力品牌,是中国机床行业十强和中国机械工业500强企业．是卧轴矩台、     

与科技创新相结合 推进6S看板管理

杭州机床集团有限公司是中国机床行业十强、中国机械工业500强企业。是卧轴矩台、立轴矩台、强力成形、龙门式等四大类磨床产品国家标准和行业标准的制订者：拥有自主知识产权新产品20余种,国家专利16项,并创造了多项中国企业新纪录。平面磨床、成形磨床产销量位居全国榜首。2006年6月杭机与欧洲四大磨床公司之一的德国aba z＆b磨床有限公司结成战略联盟,     

旋转喷吹氩气在Al-Si合金熔体净化中的应用

对ZL101熔体分别采用熔剂处理、旋转喷吹氩气处理,检测处理前后的含氢量。将未净化及采用两种不同工艺处理的ZL101熔体分别浇注砂型、金属型铸件,对比两种处理方法对铸件针孔度的影响。结果表明,旋转喷吹氩气的除气效果明显优于熔剂处理;旋转喷吹氩气后,不论是砂型还是金属型,铸件针孔度都可达到一级。     

大型牛角式模具的精密铸造

牛角式模具是我厂近期制造的用于热拔钢管的模具。其材料为:4 Cr10Si2Mo,毛坯重量:23kg,轮廓尺寸:大端直径φ81mm,小端直径φ60mm,牛角弯角度101°,长度为493mm,表面粗糙度要求3.2见图1。 此类大型牛角式模具用精密铸造方法直接铸造而成,国内少见,在我们厂也是第一次。但是,通过我们努力解决生产工艺中的若干问题,最后成功地制造出了牛角式模具。     

高温焙烧对石英砂加热时的相变与膨胀性的影响

本研究采用DSC和热膨胀仪对两种石英砂的原砂和焙烧砂在加热过程中的相变和热膨胀进行了分析。结果发现,石英砂加热过程中,分别在574℃和790℃附近出现了两个吸热峰,高纯度石英砂焙烧后进行加热时只在569℃出现一个吸热峰。石英砂在加热时相变吸收的热量大于冷却时相变放出的热量,焙烧石英砂相变时需要更多的能量。石英砂的膨胀率随温度的升高而增加,焙烧石英砂的膨胀率明显低于新砂。     

Thermodynamic Assessment of DyCl3-MCl （M= Na, K, Rb, Cs） Systems

Using the CALPHAD （Calculation of Phase Diagram） technique, the DyCl3-MCl （M = Na, K, Rb, Cs） systems were optimized and calculated. The modified quasi-chemical model in the pair approximation for short-range ordering was used to describe the Gibbs energies of the liquid phase in these systems. From the measured phase diagram data and experimental thermodynamic properties, a series of thermodynamic functions were optimized base on an interactive computer-assisted analysis. The optimized parameters and the experimental data were thermodynamically self-consistent. The optimized results were discussed.     

回春之势不可挡 机床工具企业老总共议未来

2009年,中国经济走出了一条快速反转的“V”形曲线,令全球各大经济体为之侧目。2010年将是中国经济发展的一个关键年,如何走好这一年,是当前各行各业都要思考的问题。2010年机械工业总体上将呈现稳定发展的态势,机床工具行业作为基础行业,在2009年9月下旬就已经有触底回暖迹象,订单持续稳步回升,市场亦有解冻回春之势。     

Luminescence Properties of Eu^2 ＋ and Mn^2 ＋ Co-Doped CasMg（SiO4）4Cl2

The green phosphor for white LED, Ca8Mg(SiO4)4C12:Eu^2 , Mn^2 , was synthesized by high temperature solid state reaction under reducing atmosphere. During the process of the phosphor prepared, the excess CaC12 can improve the intensity of emission. The experimental results indicate that there is an effective energy transfer from Eu^2 to Mn^2 in Ca8Mg(SiO4)4Cl2 host. This kind of energy transfer may be due to resonance transfer, and this energy transfer is limited     

Luminescence Properties of Eu~(2 ) and Mn~(2 ) Co-Doped Ca_8Mg(SiO_4)_4Cl_2

The green phosphor for white LED, Ca8Mg(SiO4)4Cl2∶Eu2+, Mn2+, was synthesized by high temperature solid state reaction under reducing atmosphere. During the process of the phosphor prepared, the excess CaCl2 can improve the intensity of emission. The experimental results indicate that there is an effective energy transfer from Eu2+ to Mn2+in Ca8Mg(SiO4)4Cl2 host. This kind of energy transfer may be due to resonance transfer, and this energy transfer is limited.