Cost effective pack-boriding process for nickel alloys

在镍合金部件上形成硬耐磨的二硼化镍层是提高其机械性能和使用寿命的实用方法。固态固体渗硼工艺是一种相对简单的方法来制造这样的层，但是它依赖于复杂的相互扩散烧结工艺，目前还没有完全理解也没有优化。本研究项目的目的是研究硼化 ** 粉末成分、硼化温度、气氛和时间对在含镍合金基体上形成硬的和粘附的二硼化镍 ** 层的作用。研究将开始，首先评估现有商业硼化物粉末混合物中的相互扩散和二硼化物形成过程，然后基于这些发现，开发一种优化的硼化物粉末成分和硼化物工艺，与目前可用的工艺相比，该工艺将在镍合金不锈钢基材上以较低的成本 ** 生产出 ** 适当强度和耐磨的二硼化镍层。然后，通过研究其在以下方面的应用来研究优化工艺的更广泛意义：i）镍基合金的再渗硼，和ii）铁素体不锈钢的渗硼。

Creating a hard wear resistant nickel diboride layer on a nickel alloy component is a practical method to improve**its mechanical performance and service life. The solid-state pack boriding process is a relatively simple method to**create such a layer however it relies on a complex inter-diffusion sintering processes that is currently not**completely understood nor optimized. The objective of this research project is to study the role of boriding**powder composition, boriding temperature, atmosphere, and time on the creation of hard and adherent nickel**diboride layers on a nickel-bearing alloy substrate. The investigation will begin with first assessing the**interdiffsuion and diboride formation processes in existing commercial boride powder mixtures and then, based**upon these findings, develop an optimized boride powder composition and boriding process that will produce a**suitably strong and wear resistant nickel diboride layer on a nickel alloy stainless substrates at a reduced cost**compared to currently available processes. The broader significance of the optimized process will then be**investigated by studying its application to: i) re-boriding of nickel-based alloys, and ii) boriding of ferritic stainless**steel.