共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
3.
自热熔炼是熔池熔炼的发展方向。白银炉采用富氧熔炼为实现自热创造了有利条件。本文从热平衡出发,讨论了白银炉熔炼区取消外供热,实现自热熔炼的问题 相似文献
4.
镍基合金一般在中频炉熔炼困难,需要在真空炉内熔炼。但是利用优化工艺方案、采用氩气保护辅助措施,实现了用中频炉熔炼,精密铸造出镍基高温合金产品。 相似文献
5.
6.
7.
分析了冲天炉底焦燃烧时焦炭质量的影响因素、炉型结构与风机性能的关系,介绍了冲天炉送风网状图的使用、炉型结构与余热利用、工频感应前炉双炉熔炼等技术的应用。相关技术的应用有利于提高冲天炉熔炼铁液的质量。 相似文献
8.
一般的铸造铝合金熔炼,除使用电阻炉、中频炉及工频炉、油炉,同时考滤设备投资及燃料费用外,通常较多的采用敞开式焦炭炉进行熔炼.该炉结构简单(图1),设施投入费用低,但在合金熔炼过程中,由于炉顶部是敞开的,焦炭燃烧后产生的高温炉气始终包围着坩埚,底部风机供风充足时,焦炭完全燃烧生成的炉气呈氧化性,对熔融的铝合金存在较强的氧化作用.同时焦炭炉敞开式的熔炼方法,高温及烟尘对操作者不利,对环境也有所污染.若对这种常用的敞开式焦炭炉进行改造,做成炉顶封闭式的焦炭炉,隔绝炉气对熔融铝合金的氧化,同时也利于使用者的操作,为此对原有的焦炭炉进行改造. 相似文献
9.
张希忠 《有色金属再生与利用》2003,(4)
再生铝熔炼技术经过多年的发展,已经从小型的坩埚熔炼发展到今天的大型反射炉熔炼,目前国内最大的熔炼铝反射炉已经达到50吨以上,而且炉型也趋于多样化,并且正在向自动化方向发展。但是,在现代化的熔炼炉飞速发展的时代,我们应该看到我国众多的小型再生铝厂仍然使用原始的坩埚炉熔炼铝合金,因此,对坩埚炉熔炼铝技术进行研究是非常必要的。 相似文献
10.
再生铝熔炼技术经过多年的发展,已经从小型的坩埚熔炼发展到今天的大型反射炉熔炼,目前国内最大的熔炼铝反射炉已经达到5 0吨以上,而且炉型也趋于多样化,并且正在向自动化方向发展.但是,在现代化的熔炼炉飞速发展的时代,我们应该看到我国众多的小型再生铝厂仍然使用原始的坩埚炉熔炼铝合金,因此,对坩埚炉熔炼铝技术进行研究是非常必要的. 相似文献
11.
多元光谱拟合ICP-AES法同时测定铂中22个杂质元素 总被引:1,自引:0,他引:1
试样用HCl-HNO3溶解,采用多元光谱拟合(MSF)功能ICP-AES法同时测定铂中22个杂质元素:Pd、Rh、Ir、Ru、Au、Ag、Cu、Fe、Zn、Ni、Mn、Cr、Mg、Cd、Al、Ca、Pb、Sn、Bi、Si、Mo、Ti。对基体铂的影响、MSF功能、元素分析谱线、背景校正、仪器分析参数等进行了研究,确定了最佳实验条件。杂质元素测定范围Ag、Pd、Cu、Cr、Ti、Mn和Mo为0.0004%~0.05%;Rh、Ir、Pb、Fe、Mg、Al、Zn、Si、Bi、Ca、Cd、Sn、Au和Ni为0.0005%~0.05%;Ru为0.001%~0.05%;方法的相对标准偏差(RSD)和加标回收率分别为1.5%~8.1%和85.1%~118.5%。方法准确、快速、简便,已用于铂中杂质元素的分析。 相似文献
12.
The isothermal section of Fe-Ni-Zr ternary system at 1198K was experimentally determined using diffusion triple technique together with scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). The results indicate that there are seven binary intermetallic phases, Fe2Zr, FeZr2, NiZr2, NiZr, Ni10Zr7, Ni7Zr2, and Ni5Zr, found in the ternary system, the binary compounds NiZr2 and FeZr2 show a homogeneity range and form a continuous solid solution, namely (Fe, Ni)Zr2. Five three-phase sections, γ(Fe,Ni) Ni7Zr2 Ni5Zr, γ(Fe,Ni) Ni7Zr2 Ni10Zr7, γ(Fe,Ni) Fe2Zr Ni10Zr7, (Fe,Ni)Zr2 Fe2Zr Ni10Zr7, and (Fe,Ni)Zr2 NiZr Ni10Zr7, exist in the isothermal section. No ternary compound is observed. 相似文献
13.
14.
目的: 探讨亚甲基四氢叶酸还原酶(methylenetetrahydrofolate reductase,MTHFR),谷胱甘肽S转移酶P1(glutathione S-transferase pi-1,GSTP1),核苷酸切除修复交叉互补组-1(excision repair cross-complementing group 1,ERCC1)基因多态性与结直肠癌5-氟尿嘧啶/奥沙利铂/亚叶酸钙(FOLFOX)化疗方案疗效的相关性。方法: 150例晚期大肠癌患者抽取静脉血并提取DNA,用荧光定量PCR和高分辨率溶解曲线分型技术(HRM-SNP)等方法检测患者MTHFR、GSTP1、ERCC1基因型。所有患者均经FOLFOX方案治疗,以实体瘤化疗疗效评价标准(RECIST1.1) 评价疗效。运用SPSS 19.0 结合临床资料进行统计分析。结果: ⑴患者性别,年龄,结直肠癌分期(TNM),肿块部位等和FOLFOX化疗疗效均无明显相关性(P>0.05)。⑵GSTP1 Ile105Val Ile/Ile和Ile/Val+Val/Val有效率分别为19.7%、20.5%,两组基因型之间的OR值为 2.876,95%CI(1.288,6.424),P<0.05;MTHFR Ala222 Val Ala/Ala和Ala/Val+Val/Val有效率分别为 11.8%、28.3%,OR值为 2.236,95%CI(1.020,5.017),P<0.05。结论: GSTP1 Ile105Val 、MTHFR Ala222 Val单核苷酸多态性与结直肠癌对FOLFOX方案化疗疗效相关,检测GSTP1 Ile105Val、MTHFR Ala222Val单核苷酸多态性可能成为预测结直肠癌患者接受FOLFOX方案化疗疗效的指标。 相似文献
15.
The principle of the stretch reducing process is analyzed and three models of pass design areestablished. The simulations are done about variables, such as, stress, strain, the stretches betweenthe stands, the size parameters of the steel tube, and the roll force parameters. According to itsproduct catalogs the system can automatically divide the pass series, formulate the rolling table,and simulate the basic technological parameters in the stretch reducing process. All modules areintegrated based on the developing environment of VB6. The system can draw simulation curvesand pass pictures. Three kinds of database including the material database, pass design database,and product database are devised using Microsoft Access, which can be directly edited, corrected,and searched. 相似文献
16.
Narjes Ebrahimi Sara Rasoul-Amini Alireza Ebrahiminezhad Younes Ghasemi Ahmad Gholami Hassan Seradj 《金属学报(英文版)》2016,29(4):326-334
Magnetic-silver nanostructures were synthesized via optimized chemical conditions, and their characteristics and cytotoxicity were compared as candidates for the magnetic delivery of silver nanoparticles toward cancer cells.Magnetic-silver nanostructures were prepared through the reduction of silver ions in the presence of iron oxide nanoparticles using three different reducing agents(glucose, maltose and sodium citrate). Their physicochemical characteristics were determined using ultraviolet–visible spectroscopy, X-ray diffraction analysis, transmission electron microscopy, selected area electron diffraction analysis, Fourier transformed infrared spectroscopy, atomic absorption spectroscopy, vibrating sample magnetometry and differential scanning calorimetry. Cytotoxic activities were evaluated against a human liver hepatocellular carcinoma cell line. Fabricated nanostructures, which exhibit differences in size, silver content, magnetic saturation value and cytotoxicity, represent sufficient superparamagnetic properties and considerable cytotoxicity to be suggested as effective tools in magnetic targeting of silver nanoparticles as an approach to cancer therapy. 相似文献
17.
18.
Z. Sun S.L. Zheng Y. Zhang 《金属学报(英文版)》2007,20(3):187-192
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. 相似文献
19.
目的: 观察多囊卵巢综合征(PCOS) 模型大鼠血清性激素 T 、FSH 、LH 及瘦素(Leptin) 水平的变化, 探讨复方中药对 PCOS 模型大鼠生殖内分泌系统的影响。方法: 本实验采用 Poresky 法进行造模, 并分别以中药、西药(罗格列酮)、中西药联合用药治疗, 观察治疗后大鼠体重 、血清性激素及Leptin 水平的变化, 并进行 Leptin 水平与 FSH、LH 、LH/FSH 、T 、WEIGHT 的相关分析 。结果: 复方中药能降低血清 T 、LH 、Leptin 水平及 LH/FSH 比值, 且血清 Leptin 水平与 LH 、T 呈正相关。结论:复方中药能改善 PCOS 模型大鼠的生殖内分泌功能, 降低血清 Leptin 水平。 相似文献
20.
讲述了电焊机使用中应注意的事项,介绍了交流弧焊机的特点和弧焊变压器的分类。从交流弧焊机的安装地点及环境,动力线、开关、熔断器和焊接电缆的选择等方面详述了焊机的正确安装是保证焊机正常使用、保证安全及节约能源的重要条件。 相似文献