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GB/T 3850-2015Impermeable sintered metal materials and hard metals -- Determination of density (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

December 10, 2015

Implementation date

July 1, 2016

Scope

GB/T 3850-2015 (Impermeable sintered metal materials and hard metals -- Determination of density) is available as an English-translated PDF.

GB/T 3850-2015 is the Chinese standard "Impermeable sintered metal materials and hard metals -- Determination of density". Its scope clause reads: 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.

Its clauses include principle; apparatus and materials; specimen; procedures. It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on 2015-12-10 and took effect on 2016-07-01.

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Document preview — GB/T 3850-2015

National Standard of the People's Republic of China

ICS: 77.160
Classification: H 16

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

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

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.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 4489

Cited by

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