公开(公告)号：US5077246A

公开(公告)日：1991-12-31

申请号：US532442

申请日：1990-06-04

申请人： Samuel C. Weaver ,  Sally G. Padron

发明人： Samuel C. Weaver ,  Sally G. Padron

IPC分类号： C04B35/58 ,  C04B35/645 ,  C04B35/65 ,  C04B35/80

CPC分类号： C04B35/5805 ,  C04B35/117 ,  C04B35/645 ,  C04B35/65 ,  C04B35/80

摘要： A method for the preparation of ceramic composites containing at least aluminum oxide and aluminum boride, and the composite materials that result from the method. Intimate mixtures of finely-divided powdered aluminum metal and anhydrous boric oxide, with ratios (by weight) of about 0.5 to twenty parts of aluminum metal to one part of boric oxide, are subjected to a temperature to cause a complete reaction between the starting materials. If the ratio is above about 1.25 parts of aluminum to one part of boric oxide, the resultant product will include aluminum in addition to the aluminum oxide and aluminum boride. The ratio is selected to provide the desired hardness and toughness. Ratios between about 1 and 1.2 provide a composite having the highest hardness, with greater amounts of aluminum metal providing increased toughness. Several compositions are described, with hot pressing typically being used to provide the desired heating cycle. Typically, the mixed powders are hot pressed at about 1500 and 1600 degrees C. for about 45 minutes at 6000 psi to produce a product approaching 100% theoretical density. When additional strength is desired, various reinforcing materials can be added to the base mixture, with these reinforcing materials typically being ceramic fibers, whiskers and platelets. The resultant materials will have application as cutting tools, wear parts, armor, insualtion, etc. High yields are achieved, and the method is inexpensive.

摘要翻译： 一种制备至少包含氧化铝和硼化铝的陶瓷复合材料的方法，以及由该方法得到的复合材料。 将细分的粉末状铝金属和无水硼氧化物的紧密混合物（其重量比）为约0.5至20份的铝金属与一份氧化硼，经受温度以引起原料之间的完全反应 。 如果该比例高于约1.25份铝与一部分氧化硼，除了氧化铝和硼化铝之外，所得产物还将包括铝。 选择该比例以提供期望的硬度和韧性。 约1至1.2之间的比率提供具有最高硬度的复合材料，更大量的铝金属提供增加的韧性。 描述了几种组合物，热压通常用于提供所需的加热循环。 通常，将混合粉末在6000psi下在约1500和1600摄氏度下热压约45分钟以产生接近100％理论密度的产物。 当需要额外的强度时，可以向基础混合物中加入各种增强材料，这些增强材料通常是陶瓷纤维，晶须和血小板。 所得材料将作为切削工具，耐磨部件，装甲，绝缘等应用。实现了高产率，并且该方法便宜。