烧结

This thesis has systematically studies the microstructure of the sinter bearing fluorine of different compositions and in different sintering condition.(1) The main units of the Low Fluorine Sinter are magnetite、hematite、 SFCA、larnite、glass and pore. The cuspidine doesn't form for the low content fluorine, and the fluorine is in glass; Sinter basicity dominates the forming of the larnite and SFCA, when basicity is between 1. 72 and 1. 96, there are more larnites in the binder phase, and when the basicity is biger than 1. 96, there are more SFCA in the binder phase; the hematite appears like magnetite and usually is around pore.

为此，本文对不同组成、不同烧结条件的烧结矿样品进行了系统的显微分析和研究，其主要内容包括：(1)构成低氟烧结矿的主要组元有磁铁矿、赤铁矿、铁酸钙、硅酸二钙、玻璃体和气孔，由于含氟量的降低，枪晶石等含氟矿物并未形成，氟分布在后期凝固的玻璃体中，其中硅酸二钙和铁酸钙受碱度影响较大，硅酸二钙在碱度为1.72～1.96范围内形成较多，铁酸钙在碱度大于1.96含量增多，赤铁矿呈磁铁矿假象，多分布在气孔周围，各组元的生成顺序为：磁铁矿—硅酸二钙—铁酸钙—玻璃体。

ANSYS is a finite element simulation software used to simulate the temperature field in selective laser sintering.By using the ANSYS parameter design language,the density of the thermal flow,the velocity and the path of scanning can be controlled.The effect of the scanning path on the temperature field in the SLS process is studied. Balling,which occurs at the end of the scanning line,is caused by the dissymmetric temperature field and the great temperature gradient.

利用有限元分析软件AN SY S，对激光烧结温度场进行了数值模拟，建立了激光烧结薄板的温度模型；运用APDL语言控制热源的热流密度、移动速度以及扫描轨迹；研究了激光行程对烧结温度场的影响，扫描端点温度场的不对称及较大的温度梯度造成了端点球化现象；激光扫描线间的耦合作用使端点球化现象随扫描线的增加而逐渐显著。

The main results of investigation are as follows:(1) By hot-pressing sintering with equimolar Y2O3 and La2O3 as additives, a dense in-situ toughened Si3N4 is prepared.

1选择等摩尔Y_2O_3和La_2O_3作为烧结助剂，利用热压烧结的方法制备致密的自增韧Si_3N_4陶瓷，其相对密度高达99.8％，在1800～1840℃烧结1～2h可得到相对密度超过99％的Si_3N_4。

After optimizing the technological technique, the parameters on microwave magnetic sintering of NdFeB magnets were chosen: the powder with average particle size of 3μm was isostatically pressed at 2000kg/C㎡, and the shape of the green compact is φ18×6mm.

进行工艺优化后，我们所选用的微波烧结参数为：微波功率2kW，粉体的平均粒径3μm，压型压力2t/cm2，初坯为φ18×6mm的圆柱体，烧结最高温度约为900℃，烧结的时间70s左右。

In response to this situation VAI has recently developed the so-called MEROS process- standing for Maximized Emission Reduction Of Sintering in which dust and harmful metallic and organic components present in sinter offgas are removed in a series of treatment steps to levels previously unattained with conventional gas-treatment techniques. In a number of test campaigns conducted in a demonstration plant at voestalpine Stahl from 2005-2006, the technical and economical advantages of this innovative sinter offgas-cleaning process were verified.

基于这种情况，VAI近来开发出了一套名叫METRO的系统，能最大限度的减少烧结系统的排放，在这一系统中，烧结过程废气存在的粉尘、有害的金属物质和有机物质都在一系列的处理步骤中排除并且达到一定的水平，而这是传统的废气处理方法所无法达到的。2005到2006年间，在奥钢联位于澳大利亚林芝的实验厂里，进行了很多的试验，这一改革的烧结烟气净化处理系统的技术和经济优势得到了验证。

The analyses of size distribution and water absorption ability showed that sedimentary phase carbonates has the highest water absorption ability to form coarser pseudo-particle compared with metamorphous phase carbonates.

由於沈积岩相的菲律宾石灰石的结晶颗粒间压密程度较变质岩相的台湾大理石与日本大理石松散，在烧结过程中，容易分解并与铁矿反应，生成铁酸钙之烧结矿相比例较高，因而提升烧结矿之产率。

Also the phase transition temperature from hexagonal ZnTiO_3 phase to cubic Zn_2TiO_4 was lowed by adding V_2O_5. It was noticed that V enriched in the boundary of the exaggerated grains, while not be detected in the inner of exaggerated grains or in the boundary of small grains. At sintering temperature 50℃, orthotitanate phase Zn_2TiO_4 in zinc titanate ceramics with ≤1.00wt% WO_3 additions became major phase, while zinc metatitanate ZnTiO_3 became major phase with ≤1.00wt% WO_3 additions.

结果表明：单独掺杂V_2O_5和WO_3有效降低了陶瓷烧结温度，900℃烧结的掺杂0.75wt%V_2O_5钛酸锌陶瓷密度可达理论密度的96.1%，930℃烧结的掺杂3.00wt%WO_3钛酸锌陶瓷的密度达理论密度的95.2%；V_2O_5的添加使六方相ZnTiO_3的分解温度从900℃降到了850℃以下，V_2O_5富积于陶瓷体的晶界处，在V_2O_5富积区附近产生了异常长大的晶粒。

In this article, three kinds of prealloy powder were developed by water atomization method. The base attribute, pattern, phase composition, differential thermal analysis of powder were researched. Sintered density, hardness, bend strength, Young's modulus were researched as hot pressed sintering temperature changing. By using abrasive wearing equipment upbuilt by the authors, the wear resistance were determined. Green-pressing density, simulated green-pressing strength and bonding momental of high frequency brazing were assayed. SEM corrosion structure and SEM appearance of fracture were observed.

本文采用水雾化法开发了三种预合金代钴粉末：对粉末的基本属性、形貌，粉末的相组成，粉末的差热性进行了分析研究；测定了它们的烧结密度、硬度、抗弯强度、弹性模量随热压烧结温度变化的规律；采用作者自行建立的磨料磨损试验方法，测定了它们的质量磨损百分率；测定了它们的冷压生坯密度、模拟生坯强度以及高频钎焊的结合力矩；观察了热压烧结SEM腐蚀组织和SEM断口形貌。

In this paper,the merits of explosive sintering and its development are introduced first,then the method of explosive sintering and the mechanism of sintering are displayed,the relation of initialized specific volume to Hugoniot line of W-Ti is analyzed according to the discuss of Hugoniot line of pulverous materials.

本文首先对爆炸烧结的优点和国内外发展概况做了说明，接着对爆炸烧结方法和烧结机制作了简介，然后通过对粉末材料冲击绝热线的讨论，分析了W-Ti粉末冲击绝热线与其初始比容间的关系。

In this paper,the merits of explosive sintering and its development are introduced first,then the method of explosive sintering and the mechanism of sintering are displayed,the relation of initialized specific volume to Hugoniot line of W-Ti is analyzed according to the discuss of Hugoniot line of pulverous materials.

本文首先对爆炸烧结的优点和国内外发展概况做了说明，接著对爆炸烧结方法和烧结机制作了简介，然后通过对粉末材料冲击绝热线的讨论，分析了W-Ti粉末冲击绝热线与其初始比容间的关系。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。