氮化硅陶瓷刀具在超硬材料加工中的应用

介绍了氮化硅陶瓷刀具的切削性能、切削用量的选择和在超硬材料加工中的应用。氮化硅陶瓷刀具以其优良的切削性能解决了超硬材料难加工的问题,其使用大大降低了加工成本,有着广泛的应用前景。     

新型陶瓷刀具在机械工程中的应用

通过硬质颗粒弥散，提高了Ｓｉ３Ｎ４基和Ｔｉ（ＣＮ）基陶瓷的硬度和切削能力，解决了一系列超硬难加工材料的加工问题。新型陶瓷刀具在工业泵、轧辊、矿山机械、轴承和汽车等领域中得到了应用，提高了生产效率，降低了加工成本，促进了机械加工工艺的改革，并带来很大的社会经济效益。     

用超硬材料刀具加工工程陶瓷

本文探讨了超硬材料刀具加工工程陶瓷的可行性，介绍了不应用情况和切削机理．氮化硅是最难加工的陶瓷，本文指出，可用ＰＣＢＮ刀具加热切削的方法进行加工。实践表明，利用超硬材料刀具，可以实现工程陶瓷的高质量、高效率、低成本切削加工。     

超硬刀具在加工硬脆难加工材料中的应用

一、前言某些机器零件采用了难加工材料制造，其中包括一些高硬度的脆性材料。在这个加工领域中，超硬刀具能够发挥很大的作用。除天然金刚石外，人造金刚石在近年来已得到了更为广泛的应用。人造金刚石是以石墨为原料，加入催化剂，经过高温、高压制成单晶金刚石细粉，可用作磨料。再用金刚石细粉加入粘结剂，经过又一次高温、高压工艺，从而可以制成聚晶金刚石刀片或其它制品。用类似的工艺，亦可制成以硬质合金作为基底的金刚石复合刀片（PCD）。另一种最新的方法，是用化学气相沉积（CVD）工艺，在硬质合金或陶瓷刀片上涂覆一层金刚…     

苏联的合成超硬材料刀具和陶瓷刀具

本文详细介绍了苏联生产的合成超硬材料刀具和陶瓷刀具的牌号、性能和用途,对了解苏联超硬材料刀具和陶瓷刀具的发展状况有一定的参考价值。     

仿真技术在切削、磨削加工和陶瓷刀具开发中的应用

简单介绍了仿真技术的概念及仿真技术的发展现状，并综述了仿真技术在切削、磨削加工机理研究、工艺优化和陶瓷刀具材料开发中的应用。     

PCVD涂镀法在刀具上的应用研究

由于难加工材料的不断出现，对刀具的要求越来越高，因此有必要通过PCVD（等离子化学气相沉积技术）方法给其表面涂镀陶瓷薄膜Si3N4-BN来提高寿命。陶瓷薄膜相比其它方法，具有耐磨性、耐腐蚀性特点，恰是解决这些问题的关键。     

陶瓷刀具在精密轧辊硬车削加工中的应用

在论述硬车削及其加工优点的基础上,提出了在精密轧辊加工中采用硬车削取代磨削的方法。通过对陶瓷刀具的选用、加工机床的选用、刀具结构、刀具切削用量等方面的优化配置,可以实现精密轧辊的加工要求。试验表明,陶瓷刀具在精密轧辊硬车削加工中的应用效果良好。     

新型陶瓷刀具材料及其发展前景

陶瓷刀具具有优良的切削性能。新型陶瓷刀具已在我国冶金、水泵、矿山机械、轴承、滚珠丝杠、汽车、军工等十几个行业得到应用。针对陶瓷刀具的种类、性能和应用进行了论述．并指出陶瓷刀具材料的发展方向。     

陶瓷刀具使用中应注意的几个问题

阐述了陶瓷刀具的特点和切削性能,提出了刀具使用过程中应注意的问题.     

Al_2O_3-TiB_2 刀具的磨损特性

对ＴｉＢ２颗粒增强Ａｌ２Ｏ３刀具在车削正火态、调质态４５＃钢和球墨铸铁齿轮坯时的刀具磨损性能、磨损机理进行了研究，并与硬质合金刀具的耐磨性能进行了对比。结果表明：Ａｌ２Ｏ３┐ＴｉＢ２陶瓷刀具具有良好的耐磨性能。刀具磨损主要以脆性剥离为主，同时存在着犁耕和塑性流变过程，陶瓷刀具表面形成的粘结层结构疏松，与基体结合力较弱，较易脱落，不易形成粘结磨损。     

Wear behaviour of alumina based ceramic cutting tools on machining steels

The advanced ceramic cutting tools have very good wear resistance, high refractoriness, good mechanical strength and hot hardness. Alumina based ceramic cutting tools have very high abrasion resistance and hot hardness. Chemically they are more stable than high-speed steels and carbides, thus having less tendency to adhere to metals during machining and less tendency to form built-up edge. This results in good surface finish and dimensional accuracy in machining steels. In this paper wear behaviour of alumina based ceramic cutting tools is investigated. The machining tests were conducted using SiC whisker reinforced alumina ceramic cutting tool and Ti[C,N] mixed alumina ceramic cutting tool on martensitic stainless steel-grade 410 and EN 24 steel work pieces. Flank wear in Ti[C,N] mixed alumina ceramic cutting tool is lower than that of the SiC whisker reinforced alumina cutting tool. SiC whisker reinforced alumina cutting tool exhibits poor crater wear resistance while machining. Notch wear in SiC whisker reinforced alumina cutting tool is lower than that of the Ti[C,N] mixed alumina ceramic cutting tool. The flank wear, crater wear and notch wear are higher on machining martensitic stainless steel than on machining hardened steel. In summary Ti[C,N] mixed alumina cutting tool performs better than SiC whisker reinforced alumina cutting tool on machining martensitic stainless steel.     

Performance of ceramic tools in high-speed cutting iron-based superalloys

A series of turning tests were conducted to investigate the cutting performance of ceramic tools in high-speed turning iron-based superalloys GH2132 (A286). Three kinds of ceramic tools, KY1540, CC650, and CC670 were used and their materials are Sialon, Al₂O₃–Ti(C,N), and Al₂O₃–SiC_w, respectively. The cutting forces, cutting temperatures, tool wear morphologies, and tool failure mechanisms are discussed. The experimental results show that with the increase in cutting speed, the resultant cutting forces with KY1540 and CC670 tools show a tendency to increase first and then decrease while those for CC650 increase gradually. The cutting temperature increases monotonically with the increase in cutting speed. The optimum cutting speeds for KY1540 and CC650 when turning GH2132 are less than 100 m/min, while those for CC670 are between 100 and 200 m/min. Flank wear is the main reason that leads to tool failure of KY1540 and CC670 while notch wear is the main factor that leads to tool failure of CC650. Tool failure mechanisms of ceramic tools when machining GH2132 include adhesion, chipping, abrasion, and notching. Better surface roughness can be got using CC670 ceramic tools.     

Wear behavior and mechanisms of alumina-based ceramic tools in machining of ferrous and non-ferrous alloys

In this paper, the machining performance and wear mechanisms of two alumina-based ceramic cutting tools (Al₂O₃/TiB₂ and Al₂O₃/TiB₂/SiC_w) in continuous turning of hardened steel and nickel based alloy (Inconel 718) were examined. Results showed that in turning of hardened steel performed under identical conditions, Al₂O₃/TiB₂/SiC_w tool exhibited lower flank wear resistance than that of Al₂O₃/TiB₂ tool, the mechanisms responsible for this were determined to be the strong atom bonding between SiC and Fe, and the whisker pullout from the matrix for Al₂O₃/TiB₂/SiC_w ceramic tool. In continuous turning of Inconel 718, the Al₂O₃/TiB₂/SiC_w tool showed greatly improved flank wear resistance compared to Al₂O₃/TiB₂ tool, adhesion and abrasion wear were found to be the dominant wear mechanisms, the adhesion and diffusion of Ni, and Cr of Inconel 718 to the tool rake face may accelerate the tool wear rates.     

Wear characteristics of ceramic cutting tools in machining steel

Some ceramic materials such as Al₂O₃ which have a high compressive strength, hardness and chemical stability came into use industrially in the middle of this century as powder metallurgy produced indexable cutting tool inserts. These early ceramic tools were inherently weak in tension, impact and dynamic loading owing to their low tensile strength, toughness and transverse rupture strength; because of this their application was limited to medium productivity operations and work materials of softer grades. However, the technology of ceramic cutting tools has made great strides in the last few years through substantial improvements in their strength, toughness and wear resistivity. These modern ceramic tools have found wide and economic applications in high production machining of both cast iron and steels.In this paper the constructional characteristics of some modern ceramic tools and their wear behaviour and overall performances in machining mild steel at both low and high speeds are presented. The comparative results obtained are reported and discussed.     

用Al箔进行TiCp/Si3N4复相陶瓷的连接

用Ａｌ箔进行了ＴｉＣｐ／Ｓｉ３Ｎ４复相陶瓷的连接,用四点弯曲的方法测定不同连接工艺下的连接强度,并对接头界面进行ＳＥＭ,ＥＰＭＡ和ＸＲＤ分析,结果表明,由于陶瓷与钎料界面反应和界面残余应力的综合影响,随着钎焊温度和保温时间的增加,接头强度先增后降,微观分析表明,Ｓｉ３Ｎ４与Ａｌ的反应及Ｔｉ,Ｓｉ的界面扩散将影响接头的力学性能。