铝化物

First, the speed of the reaction between mud acid and rock is very fast, the effective distance of acid is short, active acid can not reach deep formation.

首先，高温下常规土酸与地层矿物反应速度极快，酸液有效作用距离短，活性酸不能到达地层深部；其次，HF与铝硅酸盐的化学反应不是简单的一次反应，其副产物氟硅酸和氟铝化物还可与铝硅酸盐发生二次反应和三次反应，形成一系列不溶性的沉淀物，对储层造成严重伤害；第三，高温情况下酸液对井下管柱及工具腐蚀性很强，对缓蚀剂性能要求高。

The results show that the high temperature oxidation and sulfuration resistance of samples with aluminide coatings are improved remarkably.

结果表明，沉积铝化物微晶涂层后Q235钢的抗氧化和硫化性能均大幅度提高。

The samples with aluminide coatings for oxidation were put in air at 600 ℃ for 200 h, and those for sulfuration were put in flowing 99.98% SO2 at 600℃ for 50 h, and then SEM, EDS and XRD analyses were performed to understand the oxidation and sulfuration mechanisms of the coatings.

将沉积铝化物微晶涂层的Q235钢分别在600 ℃空气中氧化200 h和600 ℃ 99.98% SO2气氛中硫化50 h，然后进行SEM、EDS和XRD分析。

The oxidation life time of aluminide coatings at high temperatures is difficult to measure experimentally.

对铝化物涂层高温氧化寿命进行实验检测，是一项十分费时且耗能的工作。

In this paper the as-cast microstructure, the rules of phase precipitation, the change of microstructure and minor phase content and the degeneration of aluminide coating after thermal exposure at temperature range from 850℃ to 1100℃ for 1000-3000 hours have been studied in comparison between two kinds of low chromium-high tungsten cast nickel-base superalloys.

本文对比地研究了两种低铬-高钨系列的铸造镍基高温合金的铸态显微组织，在850～1100℃范围内热暴露1000～3000小时后的相析出规律，显微组织和微量相的变化及铝化物涂层的蜕化。

The recent advances in the first principles calculations and atomistic simulations further help us in understanding atomic bonding, dislocation configuration and alloying effects in intermetallics which has led to the development of nickel, iron and titanium aluminide alloys with improved mechanical and metallurgical properties for structural use.

第一原理计算和原子结构模拟的新近研究结果能进一步帮助了解金属间化合物的原子结合键性质、位错组态和合金元素的作用。对基本问题的更好了解导致镍、铁和钛的铝化物金属间化合物合金的力学和冶金性能的改进，更接近了结构方面应用的要求。

Simple aluminide coating was damaged completely and lost its protective effect.

目前高温防护涂层主要分为三类，扩散型铝化物涂层、MCrAlY 型包覆涂层和热障涂层[1]。

Based on progress and tendency of high-temperature coating recently, Evolution and character of high-temperature coatings on aluminide, McrAlX and thermal barrier coating was commented, as well, progress and tendency of their structure.

该文在综合高温涂层的发展历程和研究、应用现状的基础上，简单评述了铝化物、McrAlX、热障涂层各自的发展及性能特点，以及这些涂层结构的研究发展状况；讨论了活性元素、晶界效应和涂层结构对高温涂层性能的影响机制；介绍了几种常用制备方法：扩散渗镀、PS、EB-PVD、磁控溅射的特点和应用情况。

The high-temperature oxidation and degradation behavior were analyzed for the aluminide coating on Co-base superalloy , and the relationship between the oxidation and life has been deduced for the coating.

通过分析钴基超合金外扩散型铝化物涂层的高温氧化及退化行为，并采用近似方法推算，得出了这类涂层氧化和退化与时间的关系。

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

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。