Standard No.:	GB/T 13390-2008
English Name:	Metallic powder-Determination of the specific surface area - Method of nitrogen adsorption
Chinese Name:	金属粉末比表面积的测定 氮吸附法
Chinese Classification:	H16    Powder metallurgy analysis method
Professional Classification:	GB    National Standard
Issued by:	AQSIQ; SAC
Issued on:	2008-03-31
Implemented on:	2008-9-1
Status:	valid
Superseding:	GB/T 13390-1992 Metallic powder－Determination of the specific surface area－Method of nitrogen adsorption
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	150.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the determination method of specific surface area of metallic powder. This standard is applicable to the determination of specific surface area of metallic powder, with the range of 0.1 m2/g to 1,000 m2/g. It may be used as reference for the determination of specific surface area of non-metallic powder and microporous materials. The specific surface area measured in this standard is the total specific surface area of the powder, including any open pore specific surface area allowing nitrogen molecules to enter the powder body; it is different from the specific surface area measured by air permeation method, which refers to the envelope surface area. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies. GB/T 5314 Powders for powder metallurgical purposes—Sampling 3 Terms and symbols 3.1 Terms 3.1.1 adsorbate adsorbed gas concentrating on the surface of the adsorbent 3.1.2 adsorbent powder for adsorbing measuring gas 3.1.3 equilibrium adsorption pressure pressure of the gas when the adsorbate reaches equilibrium 3.1.4 saturation vapour pressure vapour pressure when the adsorbate is completely liquefied at the adsorption temperature 3.1.5 relative pressure ratio of equilibrium adsorption pressure to saturation vapour pressure 3.1.6 adsorption volume volume of gas adsorbed by the adsorbent under equilibrium adsorption pressure 3.1.7 dead volume volume of adsorbate failing to reach the area under equilibrium pressure

Foreword i 1 Scope 2 Normative references 3 Terms and symbols 4 Principle 5 Apparatus and materials 6 Sampling 7 Procedures 8 Calculation 9 Test report Annex A (Informative) Saturation vapour pressure of liquid nitrogen