【摘要】 采用原子吸收光谱(AAS)标准曲线法对YG系列硬质合金刀具酸蚀后浸蚀溶液中Co浓度进行定量测试,利用AAS测试结果定量计算了相应酸蚀时间下的去钴深度;对所获得的YG系列硬质合金刀具浓度-时间曲线、去钴深度-时间曲线进行了回归分析,利用回归分析的结果对YG类硬质合金酸蚀特性及去钴深度进行了定性及定量分析;采用辉光放电发射光谱仪(GDS)对确定酸蚀时间条件下硬质合金刀具中Co元素进行定量薄层(QDP)分析,并与原子吸收光谱标准曲线法测试结果进行对比研究。结果表明:YG类硬质合金刀具含Co量、WC晶粒大小、晶界数量及其几何形态等对酸蚀速度有重要影响;YG8刀具酸蚀速度比YG6,YG6X快,YG6刀具的酸蚀速度较YG6X快,且随着腐蚀时间的延长,酸蚀速度差异愈大;定量薄层(QDP)分析结果表明,去Co深度与酸蚀时间关系的拟合函数可以用来快速分析王水对YG系列刀具的刻蚀深度。更多还原

【Abstract】 Co concentration in the etching liquor was tested by atomic absorption spectrometry,the etching deepth after different acid corroding time was quantitatively calculated with the AAS test result.Using the methods of multivariate linear regression analysis,the curves of the relation between Co concentration and etching time,and the relation between etching depth and etching time were studied,the regression analysis results were utilize to qualitatively analysis acid corroding feature or quantitatively analysis etching depth.the microstructure of YG series cemented was observed by SEM,Co distribution after definitive etching time in the carbide cemented was analysis by QDP on Glow Discharge optical atomic emission spectrometry.the results show that crystal size and Co concentration of carbide cemented significantly impact on its acid corroding speed,the quantity and geometry shape of grain boundary has the same important effect.Acid corroding speed of YG8 is always faster than that of YG6,but acid corroding speed of YG6X is always slower than that of YG6,furthermore the distinction of acid corroding speed gets greater with etching time going.QDP test results show that the fitting curves of the relation between etching depth and etching time for YG series cemented carbide may be used to celerity analyze etching depth of YG series cemented carbide in aqua fortis liquor before diamond coated.更多还原