WADSWORTH Jeffrey and FLUSS Michael(Chemistry and Materials Science Directorate
,
Lawrence Livermore National Laboratory
,
Livermore
,
CA 94551)
金属学报(英文版)
The role of the National Laboratories is summarized from the era of post World War II to the present time. The U.S. federal government policy for the National Laboratories and its influence on their materials science infrastructure is reviewed with respect to .determining overall research strategies, various initiatives to interact with industry (especially in recent years),building facilities that serve the nation, and developing leading edge research in the materials sciences. Despite reductions in support for research in the U.S. in recent years, and uncertainties regarding the specific policies for Research &Development (R&D) in the U.S., there are strong roles for materials research at the National Laboratories. These roles will be centered on the abilities of the National Laboratories to field multidisciplinary teams, the use of unique cutting edge facilities, a focus on areas of strength within each of the labs,increased teaming and partnerships, and the selection of motivated research areas. It is hoped that such teaming opportunities will include new alliances with China, in a manner similar, perhaps, to those recently achieved between the U.S. and other countries.
关键词:
: U.S. Materials Science. U.S. National Laboratories and Facilities
,
null
王艺慈
,
罗果萍
,
柏京波
,
郝志忠
,
邬虎林
钢铁
采用差热分析（DTA）与X射线衍射（XRD）相结合的方法，研究了高碱度烧结矿中F、K、Na对烧结固相反应开始温度与最初形成产物的影响规律，研究结果表明：烧结原料中F、K、Na的存在，促进了烧结固相反应过程中低熔点化合物硅酸钠、铁酸钠、枪晶石的形成，固相反应过程中硅酸钠自702 ℃，铁酸钠自780 ℃，枪晶石自900 ℃开始合成，从而探明了F、K、Na在烧结固相反应过程中的行为规律。
关键词:
烧结固相反应;固相反应开始温度;最初形成产物
王艺慈
,
罗果萍
,
柏京波
,
郝志忠
,
邬虎林
钢铁
采用差热分析(DTA)与X射线衍射(XRD)相结合的方法,研究了高碱度烧结矿中F、K、Na对烧结同相反应开始温度与最初形成产物的影响规律,研究结果表明:烧结原料中F、K、Na的存在,促进了烧结固相反应过程中低熔点化合物硅酸钠、铁酸钠、枪晶石的形成,固相反应过程中硅酸钠自702℃,钦酸钠自780℃,枪晶石自900℃开始合成,从而探明了F、K、Na在烧结固相反应过程中的行为规律.
关键词:
烧结固相反应
,
固相反应开始温度
,
最初形成产物
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
The influence of sputtering on the high temperature oxidation resistance of the cast superalloy M17F has been studied. The as-sputtered microcrystalline layer has a homogeneous gamma phase structure with very fine gl ain size (20-100 nm), while the as-cast alloy is composed of gamma, gamma' and carbides. The oxidation resistance of the microcrystalline coating of K17F alloy is much better than that of the as-cast alloy, and is even superior to that of the pack aluminized alloy. At the initial oxidation stage, the oxide scale which formed on the as-cast alloy is composed of complex oxides of Cr, Ti, Ni and Al. As the: oxidation time is prolonged, the amount of alpha-Al2O3 increases and becomes the main product. However, the scale which formed on the microcrystalline coating consists only of alpha-Al2O3. Cyclic oxidation and acoustic emission examination showed that the oxide scale on the cast M17F alloy easily spalled during cooling, but the alpha-Al2O3 scale on the sputtered layer had excellent adhesion. The beneficial effects of microcrystalline structure on oxidation resistance are discussed briefly.
关键词:
K17F;sputtering;oxidation behavior
吴振雄
,
何小玲
,
周海涛
,
涂衡
,
岳银超
,
张昌龙
,
胡章贵
人工晶体学报
采用水热法,探索了 K4Gd2(CO3)3F4晶体的析晶条件,诸如生长原料及配比、生长温度、生长周期等,并成功生长了毫米级的透明单晶.对生长的晶体进行了XRD、UV-Vis-NIR、SHG等测试,结果表明,K4Gd2( CO3)3F4晶体在380～2000 nm波段的透过率超过80％,紫外吸收截止边低于200nm；其二阶非线性光学效应约为KDP的3.5倍.
关键词:
非线性光学晶体
,
K4Gd2(CO3)3F4晶体
,
水热法
