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NARC Rayon Replacement Program for the Space Shuttle Reusable Solid Rocket Motor Nozzle: Screening Summary

机译：用于航天飞机可重复使用的固体火箭发动机喷嘴的NARC人造丝更换计划：筛选摘要

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摘要

Thiokol Corporation and NASA MSFC are jointly developing a replacement for North American Rayon Corporation (NARC) Aerospace Grade Rayon (1650/720 continuous filament), the precursor for the Carbon Cloth Phenolic (CCP) ablatives used in the Space Shuttle Reusable Solid Rocket Motor (RSRM) Nozzles. NARC discontinued production of Aerospace Grade Rayon in September 1997. NASA maintains a stockpile of NARC Rayon to support RSRM production through the summer of 2005. The program plan for selection and qualification of a replacement for NARC rayon was approved in August 1998. Screening activities began in February 1999. The intent of this paper is to provide a summary of the data generated during the screening phase of the NARC Rayon Replacement Program. Twelve cellulose based fibers (rayon and lyocell) were evaluated. These fibers were supplied by three independent vendors. Many of these fibers were carbonized by two independent carbonizers. Each candidate was tested according to standard acceptance test methods at each step of the manufacturing process. Additional testing was performed with the candidate CCPS, including hot fire tests, Process studies and mechanical and thermal characterization. Six of the twelve fiber candidates tested were dropped at the conclusion of Phase 1. The reasons for the elimination of these candidates included; difficulties in processing the material in the whitegoods, carbon and CCP forms; poor composite mechanical performance; and future availability concerns. The remaining six fibers demonstrated enough promise to merit continued evaluation and optimization of the CCP fabrication process. Note: Certain CCP data falls under the restrictions of US export laws, (ITAR, etc.) and will not be included in this paper.
机译：Thiokol公司与NASA MSFC共同开发了北美人造丝公司（NARC）航空级人造丝（1650/720连续长丝）的替代品，后者是用于航天飞机可重复使用的固体火箭发动机（CCP）烧蚀剂的前身（ RSRM）喷嘴。 NARC在1997年9月停止了航空级人造丝的生产。NASA保留了NARC人造丝的库存，以支持RSRM的生产直到2005年夏季。1998年8月批准了选择和鉴定NARC人造丝替代品的计划计划。开始了筛选活动本文的目的是概述NARC人造丝替代计划的筛选阶段所产生的数据。评价了十二种纤维素基纤维（人造丝和莱赛尔纤维）。这些光纤由三个独立的供应商提供。这些纤维中有许多是由两个独立的碳化器碳化的。在制造过程的每个步骤中，根据标准验收测试方法对每个候选人进行了测试。使用候选CCPS进行了其他测试，包括热火测试，过程研究以及机械和热特性。在阶段1结束时，测试的十二种纤维候选物中有六种被丢弃。难以处理白色物品，碳和CCP形式的材料；复合机械性能差；和未来的可用性问题。剩余的六根纤维表现出足够的潜力，值得继续评估和优化CCP制造工艺。注意：某些CCP数据受美国出口法律（ITAR等）的限制，因此不会包含在本文中。

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