查询词典 cementation

Oxidation-resistant silicide coatings on an Nb-based alloy were prepared by pack cementation technique. The holding temperatures were 1 050, 1 150 and 1 250 ℃ and the holding time were 2, 5, 10, 15 and 20 h, respectively.

摘 要：利用包埋渗法在铌基合金上制备抗氧化硅化物涂层，渗硅温度分别为1 050、1 150和1 250 ℃，渗硅时间分别为2、5、10、15和20 h。

A MoSi2 coating on C-103 niobium alloy was prepared by packing cementation, and the microstructures of the oxidized and unoxidized coatings were analyzed by XRD, SEM and EDS techniques. The formation mechanism of the silicide coating was investigated. The results show that the silicide coating is formed by reactive diffusion and the silicification process obeys parabolic relation.

采用包渗法在C-103铌合金基体上制备MoSi2涂层，通过X射线衍射、扫描电镜和能谱分析等手段研究涂层表面、截面形貌以及氧化后涂层结构变化，并分析硅化过程中涂层的形成机理。

In this paper, the author studied the plastic shrinkage of the alkali slag cementation materials with variable activators, proportion between slag and sand, different sodium oxide content and modulus of water glass.

本文研究了激发剂种类、矿砂比、氧化钠当量和水玻璃模数对碱矿渣砂浆塑性收缩的影响。

Purification is mainly done by adding zinc dust to the solution. As all the elements to be removed lie below zinc in the electrochemical series they can be precipitated by cementation.

净化过程主要是加入锌粉到溶液，这样所有电位序在锌之后的元素都被置换出来并且凝固沉淀下来。

It is an important consideration in purification circuits that removal cadmium completely prior to cobalt cementation, because cadmium can inhibit basic zinc sulphate to adsorb on the surface of zinc dust.

镉可以起到阻止碱式硫酸锌或氢氧化锌吸附在锌粉表面的作用。欲加速钴的置换和提高置换效率，必须形成锌-钴合金或锌-镉合金。

TiAl ; cyclic oxidation ; surface modification ; aluminide coating ; pack cementation

TiAl ；循环氧化；表面改性；铝化物涂层；包埋渗

Solvent extraction of gold from alkaline aurocyanide solutions has more potential advantages over present zinc-dust cementation and carbon-adsorption procedures.

溶剂萃取法从碱性氰化液中提取金的工艺相对于传统锌置换法和活性炭吸附法具有潜在的优势，因而备受青睐。

The research on sedimentary facies and diagenesis of the reservoir combined with analyses of diagenesis effect of low permeability resevoir on the reservoir property and with division of diagenesis stages indicates that the genetic mechanism of the low permeability reservoir in this area is the filling and cementation of autogenetic mineral during diagenesis.

该项研究是建立在储层沈积相、成岩作用研究的基础上，通过分析低渗透储层成岩作用对储集物性的影响及成岩作用阶段划分，认为造成本区储层砂岩渗透率较低的主要原因是成岩期各种自生矿物的充填和胶结作用。

Four main formations of loop bedding in Jiyang sub-basin were upper layers fall down in the process of earthquake, tautening distortion due to earthquake, the frication of earthquake-related surface of fault and the effect of redox and diffuse other formations of loop bedding comprise the effect of earthquake wave, the effect coming from circumrotate of globosity rotation, snowball function, cementation intermittent, the effect of biology, and so on.

综合分析认为震动塌落、震动拉伸变形、地震断裂面的摩擦作用、氧化还原反应和扩散作用是环状层理的主要成因，前三种成因的环状层理往往与其他震成构造伴生，可作为震积岩的良好标志。环状层理的其他成因还包括：地震波传播方式的影响、地球自转产生的涡旋的影响、&滚雪球&效应、间歇胶结作用以及生物成因等。

It can be mixed with various greases. Under the action of high temperature short time and high pressure produced by the friction, nanometer ceramic power will have cementation and densify the worn metal su*****ce layer, and form a layer of cermet, thus, restore the worn parts to optimum fit clearance and lubrication status.

不含毒素、重金属和强化物，可与各类油脂混合，在摩擦产生的瞬间高温、高压力的作用下，纳米陶瓷粉体在磨损金属表层渗镀和致密，生成一层金属陶瓷，从而使磨损部件恢复到最佳的配合间隙和润滑状态。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。