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In tungsten carbide tools fabricated by sintering WC and Co, mechanical properties are strongly governed by the distribution and number of W atoms that diffuse from WC grains into Co regions. This paper reports on the use of Auger electron spectroscopy (AES) to determine the concentration of W atoms diffused into a Co region across the WC/Co interface in a tungsten carbide tool. Directly analyzing the distribution of diffused W in the Co region near the WC/Co interface by AES is difficult because the Auger signal derived from the WC grain by the backscattering effect cannot be ignored. We propose a practical method for estimating the W concentration across the WC/Co interface by taking into account the backscattering effect. We prepared a WC/Co model sample with negligible W diffused into the Co region. The AES line profiles of W and Co across the WC/Co interface in the model sample agreed with the line profiles calculated by Monte Carlo (MC) code taking into account the backscattering effect. Then, we measured AES line profiles over a WC/Co/WC region in a real tungsten carbide tool with W diffused into the Co region and we calculated profiles without W diffusion into the Co region by MC code. The W distribution in the Co region was estimated by taking into account the backscattering effect: The calculated profile was subtracted from the measured profile to remove the background component introduced by the backscattering effect.

Auger Electron Spectroscopy Analysis of W diffused from WC Grain into Co Regions in Cutting Tools