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介绍了当前在拉拔、挤压、冲裁、等温锻造等各类模具中应用的陶瓷材料如金属陶瓷、ZTA,TZP,TZP/Al2O3,TZP/TiC/Al2O3,Al2O3/TiC,PSZ,Si3N4,Sialon等使用性能方面的研究现状,探讨了陶瓷模具材料研究与应用中存在的问题,展望了陶瓷模具材料的应用前景。提出陶瓷模具材料的增韧补强、模具结构优化设计和表面陶瓷化改性技术等将是提高陶瓷模具使用性能的有效措施,而且随着模具技术的迅猛发展,其应用前景也将日益广阔。 相似文献
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陶瓷模具模芯通常采用 Cr12MoV制做,强度高,耐磨性良好。正常情况下,其使用寿命为 35~ 40万次。模芯的刃口部分由于受到坯料微粒的磨损,并承受一定的压力和冲击力,很容易损坏。失效形式主要为刃口部位磨损和由疲劳或碰撞模具衬板导致的刃口崩裂。若失效后直接报废换用新的备品,生产成本很高。但若进行修复处理,则只要将失效部位堆焊一层耐磨合金,经简单研磨放电加工重加橡胶即可。目前 300 cm× 300 cm的 Cr12MoV新制芯约 1 700元 /块,而修复处理同规格模芯费用只需约 500元 /块。选用适当的焊材、设计合理的工艺,修复件… 相似文献
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全面综述了表面镀层、表面复合、表面涂覆等表面改性技术在各类陶瓷模具中应用、研究的现状。指出:表面改性技术既能发挥陶瓷材料的高硬度、高耐磨和耐高温等的优势,又能发挥金属基体高强度、高韧性的特点,从而使得陶瓷模具材料具有良好的使用性能,具有广阔的应用前景。今后研究的重点是如何通过表面改性工艺的控制和复合层材料的合理选择和设计,使得所形成的陶瓷复合层与金属基体结合强度高,硬度高,既减摩又耐磨。 相似文献
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陶瓷表砖模具的国产化 总被引:1,自引:0,他引:1
<正> 从意大利引进的陶瓷表砖生产线上的陶瓷表砖模具,是生产线的最易损部分,它的结构见图1。它包括框架、塞板、上模和下模四部分。1个框架固定在压机的工作台上,28块塞板分别用螺钉固定在框架上,7块上模用 相似文献
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阐述了微注射成型技术的最新进展,重点介绍了微注射成型机和模具、微注射工艺、成型材料的研究现状,展望了微注射成型的发展趋势。 相似文献
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陶瓷粉体表面化学镀技术 总被引:3,自引:0,他引:3
本文综述了陶瓷粉体表面化学镀技术的一般方法,研发现状与应用前景,介绍了化学镀技术的过程及其影响因素,展望了陶瓷粉体表面金属化学镀技术的发展前景. 相似文献
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In austenitic castings, the solidification modes A, B, and mixed AB with either A or B structures can all be found in alloys that lie in the specification range for ASME SA351 Grade CF3. Mode A structures are found at (Cr/Ni) equiv>2.2 whilst mode B structures occur for (Cr/Ni) equiv <2.0. For intermediate values of the (Cr/Ni) equiv mixed AB structures are found. Type A structures are equiaxed and can be regarded as macroscopically isotropic. As such, their acoustic attenuation is uniform and the ultrasonic beam does not distort on propagation through these materials. In contrast, Type B materials are highly anisotropic because of their coarse grained, columnar structure which results in a highly variable acoustic attenuation and distortion and skewing of the ultrasonic beam. As part of the safety case for the Sizewell “B” Pressurised Water Reactor (PWR) the Central Electricity Generating Board (CEGB) is fabricating test blocks containing known defects which will be used to validate the ultrasonic operators who will inspect the cast austenitic pump-casings of the primary circuit. This paper describes the development of the ultrasonic technique to inspect the pump casings based upon a detailed knowledge of the metallurgy of stainless-steel castings, the propagation of ultrasound in coarse grained austenitic materials and the design of the pump casing itself. 相似文献
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Investment casting has been widely recognized as the best option in producing TiAl components with key benefits of accuracy,versatility and integrity.The collapsibility of ceramic moulds for investment casting is critical in the manufacturing process of TiAl components due to TiAl’s intrinsic brittleness at room temperature.The aim of the present research is to provide a method for production of TiAl components by investment casting in ZrO2 ceramic moulds with improved collapsibility.Slurries prepared with high polymer additions were utilized during the preparation of ceramic moulds.The stress/strain curves obtained from green and baked ceramic moulds demonstrate that the green strength was increased with the application of high polymer,while baked strength decreased,thus the collapsibility of ceramic moulds was improved.It is suggested that this result is related to the burn-out of high polymer which left a lot of cavities.The experimental findings were also verified by the investment casting of "I"-shaped TiAl components. 相似文献
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研究粉料的粒度分布对TiAl合金熔模精密铸造用氧化锆陶瓷性能的影响。对粉料粒度分布、粉末形貌、浆料黏度、型壳抗弯强度和断裂形貌之间的关系进行研究;通过测量氧化锆粉末和粘结剂构成的浆料的黏度来考察粉末粒度分布对浆料黏的影响;对不同粒度分布氧化锆陶瓷型壳断口形貌进行观察。结果表明:粉料粒度分布对未焙烧和焙烧后氧化锆陶瓷型壳的强度影响行为相似;粉料粒度分布对氧化锆陶瓷型壳的质量能产生很大的影响并进而影响到熔模精密铸造制备TiAl合金构件的质量。 相似文献
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Dry stock of silica sol ceramic mould was prepared by using of colloidal moulding technique with an optimized vacuum drying process.Effect of roasting process on the shrinkage rate and compressive strength of zircon-silica sol ceramic mould,and the relationship between the roasting temperature and microstructure of zircon-silica sol ceramic mould were studied.The optimum roasting temperature of zircon-silica sol ceramic mould gained by the experiments is 900℃ and the holding time is 2 h.The scanning electro... 相似文献
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分析了酶箱的生产工艺,通过比较模具设计方案,选择模具结构好、操作方便、塑件质量和经济性较好的方案制作了模具,并制定了旋塑生产工艺,生产出了合格塑件。 相似文献