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陶瓷刀具材料以其高硬度、高耐磨性和耐热性著称.在高速切削时,当切削温度达到1450℃时仍能继续进行切削.但陶瓷刀具材料所固有的脆性限制了其实际应用范围.因此,如何提高陶瓷刀具材料的强度和韧性是其能否广泛应用的关键.目前国内外所采用的方法都是通过提高其本身的强度和韧性来实现,如:利用颗粒增韧、相变增韧和晶须增韧等方法来提高其强度和断裂韧性,但增强补韧的幅度十分有限,与硬质合金刀具相比,其强度和韧性仍嫌不足.而硬质合金刀具具有较高的强度和韧性,但其硬度、耐磨性和耐热性能却比陶瓷刀具材料要低得多,当切削温度达到1000℃时,刀具已无法继续进行切削.为了进一步提高硬质合金刀具的耐磨性和耐热性能,70年代出现了涂层硬质合金刀片,主要是利用高强度和高韧性的硬质合金作为基体,在其表面涂以一层高硬度、高耐磨性的碳化物、氮化物、氧化
Known for its high hardness, high wear resistance and heat resistance, ceramic tool materials continue to cut at high cutting speeds up to 1450 ° C However, the inherent brittleness of ceramic tool materials limits their practical application Therefore, how to improve the strength and toughness of ceramic tool material is the key to whether it can be widely used.Nowadays, the methods adopted at home and abroad are all realized by improving its own strength and toughness, such as: Toughening and whisker toughening methods to improve its strength and fracture toughness, but to enhance the extent of toughening is very limited, compared with carbide cutting tools, the strength and toughness is still not enough, and carbide cutting tools with high Strength and toughness, but its hardness, wear resistance and heat resistance is much lower than the ceramic tool material, when the cutting temperature reaches 1000 ℃, the tool has been unable to continue cutting.In order to further improve the resistance of carbide cutting tools Grinding and heat resistance, the 70s appeared coated carbide blade, mainly the use of high strength and toughness of the cemented carbide as the substrate, coated with a layer of its surface hardness, high wear resistance Compounds, nitride, oxide,