致密层

MgO/Si3N4复合材料表面致密层的形成机理

Forming Mechanism of Compact Layer on the Surface of MgO / Si_3N_4 Composite

结果表明：逆反应烧结工艺可制备出性能良好的复合物；Si、Al除可促进烧结外，还能提高致密层的密度和宽度。

The experimental results show that the converse reaction sintering is able to make high performance composites and metal Si and Al not only can promote the sintering but also can increase the density and width of compact layer .

研究了镁碳耐火材料表面的MgO致密层的形成过程和机理。

Formation process and mechanism of MgO dense layer formed on the surface of magnesia-carbon refractories were studied .

与电熔镁砂相比，使用烧结镁砂为原料时，耐火材料表面更容易形成MgO致密层。

Compared with electro-fused magnesite , sintered magnesite is more effective for the formation of MgO densed layer .

影响镁碳耐火材料表面MgO致密层形成的因素含炭耐火材料表面防氧化涂料的试制

Effect of some major factors on the formation of MgO densed layer formed on the surface of magnesia-carbon refractories

病理改变以黑质致密层多巴胺神经元部分缺失、神经元中有路易小体（LewyBody，LB）形成等为特点。

The pathological changes are characterized by deficiency of dopaminergic neurons in substantia nigra compacta and formation of Lewy body ( LB ) in neurons .

同均一相PZT薄膜材料相比，由致密层和多孔层交替排列形成的近周期PZT多层膜具有铁电、介电增强效应。

Compared with the uniform PZT thin films , the PZT multilayer with alternating dense-PZT and porous-PZT layers exhibits an enhancement both in ferroelectric and dielectric performances .

使用扫描电子显微镜（SEM）观察，2090铝锂合金陶瓷膜层与合金基体结合良好，具有致密层和疏松层两层结构；

Scanning by SEM , the photos show that 2090 Al-Li alloy ceramic coating is combined well to the Al substrate , which is composed of two-layer structure with surface loose zone and compact zone .

结果表明：MgO致密层在与熔融金属接触部分的耐火材料表面上形成，而在与熔渣接触的表面上不能形成；

The results showed that the MgO dense layer was formed on the refractories surface contacted with molten metal , but could not be formed on the refractories surface contacted with molten slag .

结果表明，微弧氧化膜的致密层由单晶和多晶的γAl2O3构成，晶粒大小可达几百纳米。

It is found that the dense layer of micro-arc oxidation coating is composed of single crystalline and polycrystalline γ - Al 2O 3 with a grain size of a few hundred nm .

煤矸石菱镁矿合成堇青石熟料研究（4）与电熔镁砂相比，使用烧结镁砂为原料时，耐火材料表面更容易形成MgO致密层。

A STUDY ON PRODUCING SINTERED CORDIERITE MATERIALS BY USING COAL GANGUES AND MAGNESITE AS RAW MATERIALS ( 4 ) Compared with electro-fused magnesite , sintered magnesite is more effective for the formation of MgO densed layer .

结合FTIR和环境扫描电镜（ESEM）研究复合膜的表面形态及断面结构，讨论了复合纳滤膜致密层的结构与其性能的关系。

The surface morphological and cross section structures of composite membrane were observed by using FTIR and ESEM . And the relationship between the structure and the performance of composite nanofiltration membrane was discussed .

MgO致密层是由扩散到耐火材料表面的Mg（g）在氧化镁颗粒的周围氧化沉积，使氧化镁颗粒长大并相互连结形成的。

The MgO dense layer was formed by the oxidation of Mg ( g ) diffused onto the refractories surface and deposited around magnesia particles . By the growing of the magnesia particles , the magnesia particles contacted with each other and the MgO dense layer was formed .

氧化膜主要由TiAl2O5和TiO2相组成，还含有少量AlPO4相和Al2O3相，氧化膜疏松层中TiAl2O5相的含量明显高于致密层；

The loose layer and dense layer of MAO coating was mainly composed of TiAl_2O_5 phase and rutile TiO_2 phase , a little AlPO_4 phase and Al_2O_3 phase , and content of TiAl_2O_5 phase in loose layer was higher than that in the dense layer .

研究了镁碳耐火材料中镁砂原料的种类和碳含量，渣剂的有无及碱度，炉内气氛以及是否加铝脱氧等因素对镁碳耐火材料表面MgO致密层形成的影响。

Effect of some major factors , such as the variety of magnesite , carbon content , slag and its basicity , furnace atmosphere and Al deoxidizer , on the formation of MgO densed layer formed on the surface of magnesia-carbon refractories were studied .

微弧氧化膜主要由MgO，MgAl2O4，Al2O3组成，具有多孔结构，孔径较为均匀，分为内外两层，外层为疏松层，内层为与基体结合牢固的致密层；

The titled ceramic film , mainly composed of MgO , MgAl_2O_4 , and Al_2O_3 , had uniform and porous structure and could be classified into loose top layer and compact inner layer strongly adhered to the substrate .

MAO对焊接接头的断裂位置无影响；在拉伸过程成中，MAO陶瓷层的疏松层脱落，但是致密层和过渡层与基体结合良好；拉伸断口曾韧性断裂特征。

The MAO has no effect to the fracture location of the welding joints ; In the drawing process , ceramic porous layer of the MAO ceramic layer is loose off , but the dense layer and buffer layer have good combination with the substrate .

结果TCu220C组子宫内膜致密层和海绵层螺旋动脉的平均截面积（Area）、最大直径（Dmax）和最小直径（Dmin）显著增加（P＜0.05）。

Results The average cross section area ( Area ), maximum diameter ( Dmax ) and minimum diameter ( Dmin ) of spiral arterioles in both spongeous and dense layers of endometrium increased significantly after insertion of TCu 220C IUD .

结果表明，由于表土致密层的形成，肥液间歇入渗较连续入渗具有土壤入渗能力降低、土壤NO-3分布均匀及地下水中NO-3浓度低等特点。

Compared with the continuous infiltration , the intermittent infiltration had advantages in reducing infiltration rate effectively for the sealing layer , well-distributed nitrate in the soil and low C_ ( NO ~ - _3 ) in groundwater .

致密层和基体界面十分清晰，没有明显的过渡区，具有良好的冶金结合；

There is a clear interface and has no transition - layer .

膜层由内部致密层和外部疏松层组成。

It is composed of inner compact layer and Outer loose layer .

波涌灌地表致密层特性研究

Study on Surface Sealing Properties of Surge Flow Irrigation

表面致密层存在有缺陷。

Some defects exist in the Surface dense layer .

涂层致密层的硬度约为13.5GPa；

The dense layer of the coatings has a maximum hardness about 13.5 GPa .

波涌灌溉条件下土壤致密层的形成及其对入渗特性的影响

Formation of soil seal and its effect on infiltration characteristics in surge now irrigation

讨论了致密层形成机理和速度。

Formation mechanism of the dense zone and the rate of formation are discussed .

结果表明：该氧化时瓷膜分为两层，表面疏松层和内部致密层，厚度均为10μm左右；

The result show that the oxide film includes loose layer and compact layer with the thickness of 10 μ m.

剖面上，主要高势面多为区域性分布的烃源岩层、岩性致密层或成岩致密带；

Vertically , the main high potential interface is regional source rock , lithological dense layer or diagenetic dense zone ;

储层物性、相对致密层发育程度及断层发育情况是影响油田产油能力、含水上升速度的主要因素。

The reservoir properties , relative tight layer distribution and faults are the main factors influencing well productivity and water cut trend .

指出了涂层嵌入致密层深度比涂层厚度对膜的分离系数影响大；

The depth of the coating penetrated into the dense layer is more important than the coating thickness to the separation factor .