GB/T 34520.9-2021 English PDF

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GB/T 34520.9-2021: Test methods of continuous silicon carbide fibers - Part 9: Carbon content
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Similar standards

GB/T 34520.8   GB/T 34520.3   GB/T 34520.4   GB/T 34520.2   

Basic data

Standard ID: GB/T 34520.9-2021 (GB/T34520.9-2021)
Description (Translated English): Test methods of continuous silicon carbide fibers - Part 9: Carbon content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: V13
Word Count Estimation: 10,116
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 34520.9-2021: Test methods of continuous silicon carbide fibers - Part 9: Carbon content

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test methods of continuous silicon carbide fibers-Part 9.Carbon content ICS 49.020 CCSV13 National Standards of People's Republic of China Continuous silicon carbide fiber testing method Part 9.Carbon Content Released on 2021-05-21 2021-12-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is part 9 of GB/T 34520 "Continuous Silicon Carbide Fiber Test Method". GB/T 34520 has released the following section. ---Part 1.Bundle wire sizing rate; ---Part 2.Single fiber diameter; ---Part 3.Linear density and density; ---Part 4.Tensile properties of bundle yarn; ---Part 5.Single fiber tensile properties; ---Part 6.Resistivity; ---Part 7.High temperature strength retention rate; ---Part 8.Oxygen content; ---Part 9.Carbon content. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed and managed by the National Aerospace Technology and Application Standardization Technical Committee (SAC/TC425). Drafting organizations of this document. National University of Defense Technology, Fujian Asia New Materials Co., Ltd., Shandong Fina Technology Development Co., Ltd., China Aerospace Standard Zhunhua Research Institute, Ningbo Zhongxing New Material Technology Co., Ltd. The main drafters of this document. Wang Bing, Wang Yingde, Shao Changwei, Wang Xiaozhou, Gou Yanzi, Han Cheng, Tang Zuojiao, Xing Xin, Tang Yajuan, Huang Xiangxian, Yang Xiaofeng, Lian Shujuan, Zhang Andong, Li Jiyue, Lin Haibo, Zhou Jingyi, Ma Qing, Chen Song, Shui Hongtao.

Introduction

Continuous silicon carbide fiber is a ceramic fiber with high strength, high modulus, high temperature resistance and oxidation resistance. It is mainly used in aviation, aerospace, military High-tech fields such as nuclear equipment and nuclear industry. With the rapid development of the domestic continuous silicon carbide ceramic fiber industry, fiber development units and production orders Positions and application units need unified test standards for assessment and evaluation. GB/T 34520 aims to establish the performance index of continuous silicon carbide fiber The test method is planned to consist of nine parts. ---Part 1.Bundle sizing rate. The purpose is to specify the determination of the sizing rate of continuous silicon carbide fiber bundles. ---Part 2.Single fiber diameter. The purpose is to specify the diameter test of near-circle solid continuous silicon carbide single fiber. ---Part 3.Linear density and density. The purpose is to specify the linear density and density test of continuous silicon carbide fibers. ---Part 4.Tensile properties of bundle yarn. The purpose is to specify the tensile strength, tensile modulus of elasticity and breakage of continuous silicon carbide fiber bundles Elongation test. ---Part 5.Single fiber tensile properties. The purpose is to specify the tensile strength, tensile modulus and fracture of continuous silicon carbide single fiber Elongation test. ---Part 6.Resistivity. The purpose is to specify the resistivity of silicon carbide single fiber and bundle wire resistivity test. ---Part 7.High temperature strength retention rate. The purpose is to specify the high temperature and strength of silicon carbide single fiber under inert gas above 800 ℃ Degree retention rate test. ---Part 8.Oxygen content. The purpose is to specify the determination of oxygen in continuous silicon carbide fibers. ---Part 9.Carbon content. The purpose is to specify the determination of carbon in continuous silicon carbide fibers. In.2017, 7 related standards for the mechanical properties of continuous silicon carbide fibers have been released, and two tests of oxygen content and carbon content are planned to be supplemented in 2021. standard. This document is part 9 of this standard system, which can provide a universal test method for the carbon content test of continuous silicon carbide fibers, and promote Technical exchanges and cooperation among various units. Continuous silicon carbide fiber testing method Part 9.Carbon Content

1 Scope

This document specifies the sample preparation and sample measurement for the determination of carbon content in continuous silicon carbide fibers by the high-frequency induction combustion-infrared absorption method. Test, test result calculation, etc. This document is applicable to the determination of the total carbon content of continuous silicon carbide fibers by the high frequency induction combustion-infrared absorption method. Discontinuous silicon carbide fiber Refer to this document for the carbon content test of the peacekeeping matrix. Refer to this document for carbon content testing of other ceramic fibers.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 1446 General Principles of Test Methods for Performance of Fiber Reinforced Plastics GB/T 6003.1 Technical requirements and inspection of test sieves Part 1.Metal wire woven mesh test sieves GB/T 8170 Numerical rounding rules and the expression and determination of limit values GB/T 14599 Pure oxygen, high-purity oxygen and ultra-pure oxygen GB/T 26017 high purity copper GB/T 34520.1 Continuous silicon carbide fiber test method Part 1.Bundle wire sizing rate YS/T 659 Grade and chemical composition of tungsten and tungsten alloy processed products YS/T 1221 tin grain

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Test principle

The continuous silicon carbide fiber sample (hereinafter referred to as the sample) and flux are added to the crucible, and the sample is subjected to high-frequency induction under the combustion of carrier gas (oxygen). Should be heated to combustion, the carbon element in it reacts with oxygen to produce carbon monoxide and carbon dioxide, which are then carried by the carrier gas into carbon monoxide and carbon dioxide. The infrared absorption detection cell of carbon oxide, the infrared absorption detection cell respectively measures the concentration of carbon monoxide and carbon dioxide at 4670nm and 4260nm Absorb the light intensity and output the electrical signal value. The data receiving and processing system calculates the carbon of the sample according to the output electrical signal value and the sample quality. The content is displayed in mass fraction.

5 Test environment

The standard test environmental conditions are implemented in accordance with the standard environmental requirements specified in GB/T 1446, with a temperature of (23±2)°C and a relative humidity of (50±10)%. ......

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