稀土Y在90W-7Ni-3Fe合金中的存在形态和分布特征  

State and Distribution Characteristics of Yttrium Added in 90W-7Ni-3Fe Alloy

作　　者：范景莲[1] 刘涛[1] 彭石高[1] 祁美贵[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2011年第8期1438-1441,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51074187);国家杰出青年科学基金(50925416)

摘　　要：以喷雾干燥法制备的不同稀土Y含量的90W-7Ni-3Fe复合粉末为原料,在不同的烧结温度下制备出不同稀土含量的钨合金,采用XRD、SEM和EDX研究了稀土Y在90W-7Ni-3Fe合金中的存在形态和分布规律。结果表明:稀土Y以Y2O3的形式存在于合金中,且钨颗粒内部未发现稀土Y的存在。Y的添加量为0.4%时,以富Y颗粒的形式分布在钨颗粒与粘结相之间;当添加量为5%时,在粘结相中形成了富Y区域。添加稀土Y可以有效地细化钨颗粒。A series of 90W-7Ni-3Fe alloys with different yttrium contents were fabricated via liquid phase sintering of nano-composite powder prepared by spray drying with subsequent thermal reduction process.The rare earth Y content was 0,0.4% and 5% （mass fraction）.XRD,SEM and EDX were used to analyze the existence state and distribution characteristics of yttrium added in the 90W-7Ni-3Fe alloys.The results show that the added yttrium exists in the form of Y2O3 and Y is not detected within the W particles.When the content of yttrium is 0.4%,a new phase rich in yttrium locates between the tungsten particles and the matrix material;with the content of yttrium increasing to 5%,the yttrium-rich region appears in the matrix and the particle size of W is refined effectively.

关 键 词：稀土Y 复合氧化物Y2WO6 Y2O3 

分 类 号：TF124.5[冶金工程—粉末冶金]