GB/T 26871-2024 English PDFUS$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 26871-2024: Metallographic examination methods of the electrical contact materials Status: Valid GB/T 26871: Historical versions
Basic dataStandard ID: GB/T 26871-2024 (GB/T26871-2024)Description (Translated English): Metallographic examination methods of the electrical contact materials Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K14 Classification of International Standard: 29.120.99 Word Count Estimation: 10,167 Date of Issue: 2024-10-26 Date of Implementation: 2025-05-01 Older Standard (superseded by this standard): GB/T 26871-2011 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 26871-2024: Metallographic examination methods of the electrical contact materials---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.Metallographic examination methods of the electrical contact materials Metallographic test methods for electrical contact materials ICS 29.120.99 CCS K14 National Standard of the People's Republic of China Replaces GB/T 26871-2011 Released on 2024-10-26 2025-05-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface ... Ⅲ 1 Scope ... 1 2 Normative references ... 1 3 Terms and Definitions ... 1 4 Metallographic specimens ... 1 4.1 Sampling 1 4.2 Mounting ... 1 4.3 Grinding ... 2 4.4 Polishing ... 2 4.5 Etching ... 2 5 Detection ... 3 5.1 Measurement of Metallographic Defects 3 5.2 Measurement of Bright Band Width of Silver Oxide Metal Oxide Contacts 4 5.3 Measurement of thickness of composite layer, plating layer, welding layer, etc. 4 5.4 Microstructure Image Processing ... 4 5.5 Notes ... 4 6 Inspection Report ... 4ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting is required. This document replaces GB/T 26871-2011 Metallographic test methods for electrical contact materials. In addition to structural adjustments and editorial changes, the main technical changes are as follows. Added Chapter 3 “Terms and Definitions” (see Chapter 3); a) Changed "cutting of metallographic specimens" to "sampling" (see 4.1, 3.1 of the.2011 edition); b) The sample cutting method using sawing, wire cutting and other methods has been added, and precautions to prevent the influence of organization have been added (see 4.1); c) The hammering method in the sample cutting method has been deleted (see 3.1.1 of the.2011 edition); d) Added the content of the inspection surface of the infiltration type and component type electrical contacts (see Table 1); e) Changed "powder pressing" to "powder pressing" (see Table 1, 3.1.2 of the.2011 edition); f) Changed "rivet type multi-layer electrical contact" to "rivet type electrical contact" (see Table 1, 3.1.7 of the.2011 edition); g) Deleted the content of the inspection surface of the larger electrical contacts (see 3.1.6 of the.2011 edition); h) The content on the shape and size of the specimen has been deleted (see 3.1.9 of the.2011 edition); i) Changed "mounting of metallographic specimens" to "mounting" (see 4.2, 3.2 of the.2011 edition); j) Added the requirement that the selected mounting method should not change the original structure of the electrical contact (see 4.2.1); k) Changed "mechanically mounted specimen" to "mechanically mounted sample" (see 4.2.2, 3.2.2 of the.2011 edition); l) Added requirements to reduce penetration of polishing or etching agents (see 4.2.2); m) Changed "cast epoxy resin mounted specimen" to "cold mounted specimen" (see 4.2.3, 3.2.3 of the.2011 edition); n) Added the requirement that the test specimen be placed with the surface to be tested facing downwards (see 4.2.3); o) Changed "polishing of metallographic specimens" to "grinding" (see 4.3, 3.3 of the.2011 edition); p) The requirement that the sandpaper and the specimen should be rotated 90° to be perpendicular to the old wear marks has been deleted (see 3.3.2 of the.2011 edition); q) Changed "Polishing of metallographic specimens" to "Polishing" (see 4.4, 3.4 of the.2011 edition); r) The requirement that the test surface should be free of scratches and have a mirror finish has been deleted (see 3.4.1 of the.2011 edition); s) Deleted the explanation of the effect of humidity on polishing fabrics (see 3.4.2.2 of the.2011 edition); t) Added the recommended ratio of A. potassium ferrocyanide (red blood salt) and B. sodium hydroxide aqueous solution (see Table 2); u) Deleted the content of observable organization (see 3.6 of the.2011 version); v) The distance requirement from the two end points to the edge of the sample when measuring the width of the bright band of the internal silver oxide metal oxide contact has been deleted (see 4.3 of the.2011 edition); w) Deleted sampling and conformity determination (see 4.6 of the.2011 edition); x) Deleted some precautions on the use of microscopes (see 4.7 of the.2011 edition); y) Added the content of microstructure acquisition (see 5.4). z) Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee for Standardization of Electrical Alloys (SAC/TC 228). This document was drafted by. Guilin Jinge Electrical and Electronic Materials Technology Co., Ltd., Suzhou Sealf New Materials Co., Ltd., Anhui Xinrui New Materials Co., Ltd., Shaanxi Sirui New Materials Co., Ltd., Hebei University of Technology, Zhejiang Fuda Alloy Materials Technology Co., Ltd. Guilin Electric Science Research Institute Co., Ltd., Wenzhou Juxing Technology Co., Ltd., Zhejiang Metallurgical Research Institute Co., Ltd., Henan Science Fengxin Materials Co., Ltd., Shaanxi Baoguang Vacuum Electric Co., Ltd., Tianjin University, Tianshui Xidian Great Wall Alloy Co., Ltd., State Grid Zhi Energy Grid Research Institute Co., Ltd., Shenyang Jinchang Lanyu New Materials Co., Ltd., Guiyan Zhongxi (Shanghai) New Materials Technology Co., Ltd., Zhejiang Songfa Composite New Materials Co., Ltd., Xiamen Jinbo Precious Metal Products Co., Ltd., China Southern Power Grid Co., Ltd. Ultra-high Voltage Transmission Liuzhou Bureau of the Company, Jiangsu CRRC Electric Co., Ltd., Xi'an XD High Voltage Switch Operating Mechanism Co., Ltd., Ningbo Hanbo Precious Metal Alloy Co., Ltd., Foshan Jiazhirun Electric Co., Ltd., Wenzhou Hongfeng Electrical Alloy Co., Ltd., Ningbo Electrical Alloy Materials Co., Ltd. Company, Foshan Nuopu Material Technology Co., Ltd., Ganzhou Comprehensive Inspection and Testing Institute, Zhejiang Zhixin New Materials Co., Ltd., Zhengzhou Hao Nuo Welding Materials Co., Ltd., Schneider Electric (China) Co., Ltd. Shanghai R&D Branch, Wujiang Dongfeng Electrical Equipment Co., Ltd., Tanaka Metalor Electrical Materials (Suzhou) Co., Ltd., Guilin International Wire and Cable Group Co., Ltd., Friend Electric Power Technology Co., Ltd. Co., Ltd., Xi'an Xidian Switchgear Co., Ltd., Wenzhou Yinyu Alloy Co., Ltd., and Zhuhai Juneng Precision Industry Co., Ltd. The main drafters of this document are. Cui Jianhua, Yang Yucai, Zhang Xiaohui, Wang Xiaojun, Wang Jingqin, Bai Xiaoping, Cui Defeng, Huang Guanglin, Yu Xianwang, Zhang Guoshun, Li Peng, Sha Junwei, Shao Lianxiong, Ding Yi, Shidai, Chen Wenxiao, Zhao Chengwei, Wang Jinlong, He Xuemin, Zhao Zhen, Cao Weichan, Shi Jianhua, Liu Jialiang, Zhang Zhoulei, Zhang Shunle, Wang Yongye, Li Li, Lou Chizheng, Wang Haibin, Li Benlu, Jin Hualin, Yang Hao, Hu Bo, Ye Haijing, Li Hui, Zheng Caiwei, Li Guoshuang, Yang Hongyan, Jin Yichen, Liao Siyuan, Yuan Yang, Huang Lanxia, Yang Shunjian. The previous versions of this document and the documents it replaces are as follows. First published in.2011 as GB/T 26871-2011; This is the first revision. - Metallographic test methods for electrical contact materials1 ScopeThis document describes methods for metallographic testing of electrical contact materials. This document is applicable to the observation and analysis of the structure and defects of electrical contact materials under a metallographic microscope.2 Normative referencesThe contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies. in this document. GB/T 2900.4 Electrical terminology Electrical alloys GB/T 26872 Metallographic diagram of electrical contact materials3 Terms and definitionsThe terms and definitions defined in GB/T 2900.4 apply to this document.4 Metallographic specimens4.1 Sampling Sampling should be carried out according to the test purpose, the characteristics of the electrical contact material preparation process, and the provisions of the product technical conditions. Sampling should be carried out by sawing, When cutting by wire cutting, shearing or other cutting methods or grinding to the part to be tested, the influence on the tissue should be avoided during sampling. The sampling part shall be as per Table 1. Table 1 Common electrical contact sampling locations Electrical contact material sampling site Section of powder pressed, alloy internal oxidation, casting, and infiltration type electrical contacts perpendicular to the working surface of the electrical contacts Two cross sections of extruded, rolled, and drawn electrical contacts perpendicular and parallel to the extrusion (rolling, drawing) direction Cross section of a rivet-type electrical contact taken along the axial center of the electrical contact Two cross sections of component type electrical contacts that are perpendicular to the working surface of the electrical contacts and form a 90° angle with each other The cross section of the electrical contact with the welding layer is perpendicular to the working surface of the electrical contact and has the welding layer bonding surface The cross section of the electrical contact perpendicular to the working surface or ablation area after electrical performance operation 4.2 Mounting 4.2.1 General The size of the metallographic specimen of the electrical contact is based on the actual size of the electrical contact sample, and the corresponding sample is selected for mounting. The original structure of the electrical contacts should not be altered. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 26871-2024_English be delivered?Answer: Upon your order, we will start to translate GB/T 26871-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 26871-2024_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 26871-2024_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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