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GB/T 31968-2025: Rare earth composite yttrium zirconium oxide ceramic powder
Status: Valid GB/T 31968: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 31968-2025 | English | 279 |
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Rare earth composite yttrium zirconium oxide ceramic powder
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GB/T 31968-2025
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| GB/T 31968-2015 | English | 149 |
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Rare earth composite yttrium zirconium oxide ceramic powder
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PDF similar to GB/T 31968-2025
Basic data | Standard ID | GB/T 31968-2025 (GB/T31968-2025) | | Description (Translated English) | Rare earth composite yttrium zirconium oxide ceramic powder | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H65 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 14,192 | | Date of Issue | 2025-03-28 | | Date of Implementation | 10/1/2025 | | Older Standard (superseded by this standard) | GB/T 31968-2015 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 31968-2025: Rare earth composite yttrium zirconium oxide ceramic powder---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.
National Standard of the People's Republic of China
ICS 77.120.99CCS H 65
Rare earth composite yttrium zirconium ceramic powder
2025-03-28 Release
2025-10-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Replace GB/T 31968-2015
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 for standardization documents"
Drafting is required.
This document replaces GB/T 31968-2015 "Rare earth composite yttrium zirconium ceramic powder". Compared with GB/T 31968-2015, in addition to the structural adjustment
In addition to editorial changes, the main technical changes are as follows.
a) The application areas of the products in the scope have been changed (see Chapter 1, Chapter 1 of the.2015 edition);
b) The number and brand of product brands have been changed (see Chapter 4, 3.1 of the.2015 edition);
c) The Y2O3 and Al2O3 contents of each grade have been changed (see 5.1, 3.3 of the.2015 edition);
d) The expression method and chemical composition content of ZrO2 and HfO2 have been changed (see 5.1, 3.3 of the.2015 edition);
e) Added the grade index for the center particle size between 0.1 μm and 0.4 μm (see 5.2);
f) The provisions on total radioactivity specific activity and specific surface area have been modified (see 5.2, 3.4 of the.2015 edition);
g) The analytical methods for Y2O3, Fe2O3, Al2O3, Na2O, TiO2 and Cl- have been changed (see 6.1, 4.2 of the.2015 edition);
h) Added the test method for total radioactivity specific activity (see 6.2.4);
i) Added “Sample pretreatment and preparation of analytical solution for determination of silicon oxide content in rare earth composite yttrium zirconium ceramic powder” (see Appendix A);
j) Added “Sample pretreatment and preparation of analytical solution for determination of chlorine content in rare earth composite yttrium zirconium ceramic powder” (see Appendix B).
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 and coordinated by the National Rare Earth Standardization Technical Committee (SAC/TC 229).
This document was drafted by. Qiandong Rare Earth Group Co., Ltd., Ganzhou Keying Structural Ceramics Co., Ltd., Jiangxi University of Science and Technology,
Fujian Jinlong Rare Earth Co., Ltd., Baotou Rare Earth Research Institute, Youyan Rare Earth New Materials Co., Ltd., Guangdong Academy of Sciences Resources
Used in the Rare Earth Development Institute, National Standard (Beijing) Inspection and Certification Co., Ltd., Jiangsu Borui Optoelectronics Co., Ltd., Guorui Science and Technology Rare Earth Functional
Materials (Ganzhou) Co., Ltd., Youyan Resources and Environmental Technology Research Institute (Beijing) Co., Ltd., Youyan Rare Earth High Technology Co., Ltd., Xinfeng County Bao
Gang Xinli Rare Earth Co., Ltd. and Beikuang New Materials Technology Co., Ltd.
The main drafters of this document are. Gong Bin, Qin Haiming, Yao Nanhong, Zhu Xiaoting, Peng Niusheng, Liu Helian, Liao Zhangquan, Li Jinhui, Zhong Lanying, Li Yongming,
Ye Xinyu, Wei Laxian, Xu Huibing, Ni Haiyong, Lu Shuo, Liang Chao, Wang Weisheng, Zhang Xinnan, Zhong Xiangxi, Cui Jianguo, Ding Jianhong, Xie Shihui, Zhu Jianfeng,
Hu Ting, Sun Yue, Liang Zhiyong, Pang Xiaoxiao, Peng Haoran.
This document was first published in.2015 and this is the first revision.
Rare earth composite yttrium zirconium ceramic powder
1 Scope
This document specifies the classification, technical requirements, inspection rules, marking, packaging, transportation, storage and accompanying documents of rare earth composite yttrium zirconium ceramic powder.
The corresponding test method is described.
This document is applicable to rare earth composite yttrium zirconium ceramic powders made by chemical or physical methods, used to make structural ceramics, bioceramics, electronic ceramics
Porcelain, etc.
2 Normative references
The 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 to
This document.
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Rules for rounding off values and expression and determination of limit values
GB/T 12690.2 Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides Part 2.Ignition reduction in rare earth oxides
Determination of quantity by gravimetric method
GB/T 12690.3 Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides Part 3.Water content in rare earth oxides
Determination of quantity by gravimetric method
GB/T 12690.7-2021 Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides Part 7.Determination of silicon content
Determination
GB/T 12690.9 Chemical analysis methods for non-rare earth impurities in rare earth metals and their oxides - Determination of chlorine content - Silver nitrate turbidimetric method
GB/T 17803 Rare earth product designation method
GB/T 20170.1-2006 Test methods for physical properties of rare earth metals and their compounds Determination of particle size distribution of rare earth compounds
GB/T 20170.2 Test methods for physical properties of rare earth metals and their compounds Determination of specific surface area of rare earth compounds
GB/T 31057.1 Physical properties test of granular materials Part 1.Measurement of bulk density
GB 39176 Packaging, marking, transportation and storage of rare earth products
GB/T 43358 Determination of total α and total β radioactivity in rare earth ores and products - Thick source method
XB/T 625 Chemical analysis methods for rare earth composite yttrium zirconium ceramic materials Determination of titanium oxide, aluminum oxide, sodium oxide and iron oxide content
XB/T 631 Chemical analysis methods for rare earth composite yttrium zirconium ceramic materials Determination of zirconium oxide, yttrium oxide and hafnium oxide contents
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Categories
The product is divided into 24 grades according to chemical composition and physical properties, see Table 1 for details. The product grade representation method should comply with GB/T 17803
regulations.
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