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用气相化学反应的方式在硬质合金工具或冷作模具上沉积碳化钛来提高它们的硬度和耐磨性,这是国外一种新发展的化学表面处理方法。根据资料介绍气相沉积的TiC覆层的厚度为4～7μ,硬度为Hv2400～3800,一般为Hv2400～2700。还有资料介绍Cr12系模具钢经气相沉积后TiC覆层厚度为5～8μ,硬度为Hv4900～5100。由于TiC覆层硬度超高(约为金刚石硬度的一半,HRC62的四倍),可提高硬质合金刀具寿命2～3倍;提高冷作模寿命5～20倍。目前这种新的工艺已引起国内有关部门和工厂的广泛重视。由于TiC层非常薄,要精确测定其硬度的关键是如何选定合适的载荷。我们根据以往测定维氏硬度的
It is a newly developed chemical surface treatment method abroad that the carbides are deposited on carbide tools or cold dies by gas phase chemical reaction to increase their hardness and wear resistance. According to the information on the thickness of the TiC coating vapor deposition of 4 ~ 7μ, the hardness Hv 2400 ~ 3800, typically Hv 2400 ~ 2700. There is also information on the Cr12-based die steel vapor-deposited TiC coating thickness of 5 ~ 8μ, hardness Hv4900 ~ 5100. Due to the high TiC coating hardness (about half the hardness of diamond, HRC62 four times), can increase the life of carbide cutting tools 2 to 3 times; improve cold die life 5 to 20 times. At present, this new technology has drawn the attention of relevant departments and factories in China. Due to the very thin TiC layer, the key to accurately determining its hardness is how to select the appropriate load. We measured the Vickers hardness according to the past