SBIR Phase I: Carbon Fiber/Boron Nitride Matrix Composites: A Unique Low Wear Friction Material

这个小企业创新研究（SBIR）第一阶段项目将探索氮化硼（BN）复合材料的加工，用于各种磨损应用，重点是飞机制动器。在世界范围内进行了重大研究，以显著降低成本开发大大改进的制动材料。在考虑的方法中，使用BN作为矩阵的复合材料在期望的成本性能特征方面表现最好。第一阶段将用一种独特的预陶瓷聚合物（硼嗪）生产稳定的氮化硼复合材料，这种聚合物可以简单浸渍。与现有的碳纤维/碳（C/C）相比，这些复合材料的氧化和水解稳定性大大提高。根据初步测试，碳纤维/碳bn基体的磨损程度是碳纤维/碳bn基体的5倍。C/C基复合材料自20世纪60年代中期首次开发以来，已广泛用于军用和商用飞机制动器，后来在70年代初进行了优化。这种系统的问题包括在高温下快速磨损导致频繁更换。事实上，商业航空公司认为刹车的维护是第二严重的成本问题。

This Small Business Innovation Research (SBIR) Phase I project will explore the processing of boron nitride (BN) composites for a wide variety of wear applications with a focus on aircraft brakes. Significant research has been performed worldwide to develop greatly improved braking materials at significantly lower cost. Of the approaches under consideration, a composite using BN as a matrix appears best in terms of desired cost-performance characteristics. Phase I will produce stable boron nitride composites from a unique pre-ceramic polymer (borazine) that allows for simple impregnation. The oxidative and hydrolytic stability of these composites is greatly improved over current carbon fiber/carbon (C/C). Based on preliminary testing, a carbon fiber/carbon-BN matrix displayed a five-fold decrease in wear as compared to C/C. C/C matrix composites have been used extensively for both military and commercial aircraft brakes since they were first developed in the mid-1960s and later optimized in the early 1970s. Problems with such systems include rapid wear at elevated temperatures leading to frequent replacement. In fact, commercial airlines consider the maintenance of brakes to be the second most serious cost problem.