摘要
金刚石内的杂质是影响性能的主要因素之一,通过浓缩法(将金刚石放在马弗炉里充分燃烧后检测残余物)借助配有能谱(EDS)的扫描电镜(SEM)检测出金刚石里的杂质元素并观看了残余物的形貌。发现金刚石里包含F e、N i、C a、A l、S i、S、C l、K、N a、T i、M g等杂质;而且残余物中F e-N i合金有两种不同的形状,即片状和颗粒的聚集体。分析表明:金属杂质是更易渗透进金刚石里的,而且它们在两面顶合成的金刚石里以颗粒状杂质为主,并在金刚石里是分散排布的,由于在马弗炉里受高温作用而浓缩在一起。包裹体的存在破坏了晶格结构,影响了物理化学性能,应根据杂质的来源而尽量设法避免杂质的进入。
The impurity in diamond is one of the main factors that affects its physico-chemical properties,so it is necessary to research them.The paper studied impurity elements in diamond that were produced by belt-type press apparatus by a new way of concentration analysis.This means is the diamonds were put into a MUFFLE and burnt fully,and then residual substance were analyzed in virtue of SEM and EDS.Various kinds of impurity elements were found in the giblets,such as Fe、Ni、Ca、Al、Si、S、Cl、K、Na、Ti、Mg.Two types of shapes of Fe-Ni alloy impurities can be seen.One is the flake and the other is the congregate of grains,moreover they exist more as grain in the diamonds that were produced by belt-type press apparatus.Metal impurities were found to enter more easily into the diamonds,especially the flow inclusions Fe-Ni alloy.Their shape are mostly grain too.This congregation shows that the small grains were dispersed originally in the diamonds,and was congregated after heating.According to their sources,these impurities should be prevented from coming into diamonds because of their ruinous.So the properties of diamond can be improved.
出处
《超硬材料工程》
CAS
2006年第3期6-11,共6页
Superhard Material Engineering
关键词
金刚石
杂质元素
浓缩法
两面顶压机
金刚石单晶
应力
diamond
impurity elements
concentrated analysis,belt-type press apparatus
synthetic diamond
stress
