YS/T 428-2012 Niobium pentoxide
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and contract (or order form) of Niobium pentoxide.
This standard is applicable to niobium pentoxide prepared by liquid-liquid extraction method, which is used in the production of niobium powder, superconducting materials, alloy additives, niobium bars and niobium carbide, ceramic capacitors, etc.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1479.1 Metallic powders - Determination of apparent density - Part 1: Funnal method
GB/T 3249 Test method for Fisher number of metal powders and related compounds
GB/T 5314 Powders for powder metallurgical purposes - Sampling
GB/T 13390 Metallic powder - Determination of the specific surface area - Method of nitrogen adsorption
GB/T 15076 (All parts) Methods for chemical analysis of tantalum and niobium
3 Requirements
3.1 Product classification
The products are classified into three designations by their chemical composition: FNb2O5-1, FNb2O5-2 and FNb2O5-3.
3.2 Chemical component
Product impurity elements shall be as specified in Table 1 and the content of Nb2O5 shall be the result of 100% minus the measured impurity content listed in Table 1.
3.3 Physical properties
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test method
5 Inspection rules
6 Marking, packaging, transportation, storage and quality certificate
7 Contract (or order form)
