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

这个小型企业创新研究（SBIR）第一阶段项目将探索氮化硼（BN）复合材料的加工，用于各种各样的磨损应用，重点是飞机制动器。 世界范围内已经进行了大量的研究，以开发出成本显著降低的制动材料。 在所考虑的方法中，使用BN作为基质的复合材料在所需的成本性能特性方面表现最佳。 第一阶段将生产稳定的氮化硼复合材料从一个独特的陶瓷前聚合物（环硼氮烷），允许简单的浸渍。 这些复合材料的氧化和水解稳定性比目前的碳纤维/碳（C/C）大大提高。 基于初步测试，与C/C相比，碳纤维/碳-BN基质显示出五倍的磨损降低。 C/C基复合材料自20世纪60年代中期首次开发并在20世纪70年代初进行优化以来，已广泛用于军用和商用飞机制动器。 这种系统的问题包括在高温下的快速磨损，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个最严重的成本问题。

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.