GB/T 3850-2015 English PDF (GB/T3850-2015)

GB/T 3850-2015: Impermeable sintered metal materials and hard metals -- Determination of density
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GB/T 3850-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 16
GB/T 3850-2015 / ISO 3369:2006
Replacing GB/T 3850-1983
Impermeable Sintered Metal Materials
and Hardmetals – Determination of Density
(ISO 3369:2006, IDT)
ISSUED ON: DECEMBER 10, 2015
IMPLEMENTED ON: JULY 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Apparatus and Materials ... 4
5 Specimen ... 5
6 Procedures ... 5
7 Expression of Results ... 6
8 Test Report ... 7
9 Precision ... 7
Impermeable Sintered Metal Materials
and Hardmetals – Determination of Density
1 Scope
This Standard specifies a method of determining the density of impermeable sintered
metal materials and hardmetals.
NOTE: For the determination of density of permeable sintered metal materials, see ISO
2738:1999, Sintered metal materials, excluding hardmetals - Permeable sintered metal
materials - Determination of density, oil content and open porosity.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
ISO 4489 Sintered Hardmetals – Sampling and Testing
3 Principle
Weighing of a specimen, first in air and then in a liquid, and determine the density by
calculation.
4 Apparatus and Materials
4.1 Balance
For specimen with weight no greater than 10g, the specimen weighing shall be
accurate to ± 0.1 mg; for the specimen with weight greater than 10g, the specimen
weighing shall be accurate to ± 0.001% of the weighing. The counter poise shall be
calibrated, and have a density of no less than 7g/cm3.
4.2 Arrangement of suspension rack or suspension wire
The measuring device shall refer to Figures 1 and 2. In general case, the suspension
wire shall have a maximum diameter of 0.25 mm. A thicker suspension wire shall only
be used if this is necessary to support the heavy specimen.
4.3 Vessel
The size of the vessel shall be appropriate, which shall be such that when placing the
specimen with volume less than 10cm3 into the liquid, the rise in liquid level shall be
no greater than 2.5 mm.
4.4 Liquid
The liquid may use the distilled or deionized water, and preferably use degassed water;
to which 1 or 2 drops of a wetting agent have been added.
5 Specimen
5.1 Sampling shall be carried out according to the provisions of ISO 4489.
5.2 The volume of the specimen shall be no less than 0.5 cm3. When the volume of
the specimen is less than 0.5cm3, several specimens may be combined together for
testing; however, the volume of each specimen shall be no less than 0.05cm3.
5.3 The surface of the specimen shall be thoroughly cleaned from adhering foreign
material, such as dirt, grease and oil.
6 Procedures
6.1 Place the specimen in the upper suspension rack (Figure 1) or suspension pan
(Figure 2). The lower suspension rack shall be completely immersed into the liquid,
and the suspension wire shall be hanging freely from the suspension pan and partially
immersed in the liquid. Remove all air bubbles and weigh the specimen (m1).
6.2 Place the test piece on the lower suspension rack (Figure 1) or tie it by means of
the metal wire (Figure 2). Then transfer into the vessel containing liquid; only the
suspension wire is allowed to exposed out of the liquid level. Remove all air bubbles
and weigh.
6.3 For specimen with wight no greater than 10g, read to 0.1mg; for specimen with
weight greater than 10g, read to 0.001% of the weighing.
6.4 The specimen, liquid and surrounding air shall be at the same temperature when
weighing is carried out. The temperature of the liquid shall be determined. When
distilled water is used, its density shall be taken from Table 1.
GB/T 3850-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.160
H 16
GB/T 3850-2015 / ISO 3369:2006
Replacing GB/T 3850-1983
Impermeable Sintered Metal Materials
and Hardmetals – Determination of Density
(ISO 3369:2006, IDT)
ISSUED ON: DECEMBER 10, 2015
IMPLEMENTED ON: JULY 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Apparatus and Materials ... 4
5 Specimen ... 5
6 Procedures ... 5
7 Expression of Results ... 6
8 Test Report ... 7
9 Precision ... 7
Impermeable Sintered Metal Materials
and Hardmetals – Determination of Density
1 Scope
This Standard specifies a method of determining the density of impermeable sintered
metal materials and hardmetals.
NOTE: For the determination of density of permeable sintered metal materials, see ISO
2738:1999, Sintered metal materials, excluding hardmetals - Permeable sintered metal
materials - Determination of density, oil content and open porosity.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
ISO 4489 Sintered Hardmetals – Sampling and Testing
3 Principle
Weighing of a specimen, first in air and then in a liquid, and determine the density by
calculation.
4 Apparatus and Materials
4.1 Balance
For specimen with weight no greater than 10g, the specimen weighing shall be
accurate to ± 0.1 mg; for the specimen with weight greater than 10g, the specimen
weighing shall be accurate to ± 0.001% of the weighing. The counter poise shall be
calibrated, and have a density of no less than 7g/cm3.
4.2 Arrangement of suspension rack or suspension wire
The measuring device shall refer to Figures 1 and 2. In general case, the suspension
wire shall have a maximum diameter of 0.25 mm. A thicker suspension wire shall only
be used if this is necessary to support the heavy specimen.
4.3 Vessel
The size of the vessel shall be appropriate, which shall be such that when placing the
specimen with volume less than 10cm3 into the liquid, the rise in liquid level shall be
no greater than 2.5 mm.
4.4 Liquid
The liquid may use the distilled or deionized water, and preferably use degassed water;
to which 1 or 2 drops of a wetting agent have been added.
5 Specimen
5.1 Sampling shall be carried out according to the provisions of ISO 4489.
5.2 The volume of the specimen shall be no less than 0.5 cm3. When the volume of
the specimen is less than 0.5cm3, several specimens may be combined together for
testing; however, the volume of each specimen shall be no less than 0.05cm3.
5.3 The surface of the specimen shall be thoroughly cleaned from adhering foreign
material, such as dirt, grease and oil.
6 Procedures
6.1 Place the specimen in the upper suspension rack (Figure 1) or suspension pan
(Figure 2). The lower suspension rack shall be completely immersed into the liquid,
and the suspension wire shall be hanging freely from the suspension pan and partially
immersed in the liquid. Remove all air bubbles and weigh the specimen (m1).
6.2 Place the test piece on the lower suspension rack (Figure 1) or tie it by means of
the metal wire (Figure 2). Then transfer into the vessel containing liquid; only the
suspension wire is allowed to exposed out of the liquid level. Remove all air bubbles
and weigh.
6.3 For specimen with wight no greater than 10g, read to 0.1mg; for specimen with
weight greater than 10g, read to 0.001% of the weighing.
6.4 The specimen, liquid and surrounding air shall be at the same temperature when
weighing is carried out. The temperature of the liquid shall be determined. When
distilled water is used, its density shall be taken from Table 1.