北检（北京）检测技术研究院

The oxygen content of a powder affects both its green and sintered properties.

Hydrogen loss is a term widely used in the powder metallurgy industry even though the measurement represents an approximate oxygen content of the powder.

Oxygen is the most common hydrogen-reducible constituent of metal powders and this procedure may be used as a measure of oxygen reducible under the test conditions if other interfering elements are absent.

1.1 This test method covers the determination of the mass of hydrogen-reducible constituents in the following metal powders: cobalt copper iron and tungsten.

1.2 This test method is useful for cobalt copper and iron powders in the range from 0.05 to 3.0 % oxygen and for tungsten powder in the range from 0.01 to 0.50 % oxygen.

1.3 This test method does not measure the oxygen contained in oxides such as silicon oxide (SiO2) aluminum oxide (Al 2O3) magnesium oxide (MgO) calcium oxide (CaO) titanium dioxide (TiO2) and so forth that are not reduced by hydrogen at the test temperatures.

1.4 For total oxygen content vacuum or inert gas fusion methods are available (see Test Methods E 1019).

1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only.

This standard does not purport to address all of the safety concerns if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1.1 This specification covers parts produced from iron-phosphorus powder metallurgy materials. These parts are used in magnetic applications requiring higher permeability and electrical resistivity and lower coercive field strength than attainable routinely from parts produced from iron powder.

1.2 Two powder types are covered; Type I containing nominally 0.45 % phosphorus and Type II containing nominally 0.8 % phosphorus.

1.3 This specification deals with P/M parts in the sintered or annealed condition. Should the sintered parts be subjected to any secondary operation that causes mechanical strain such as machining or sizing they should be resintered or annealed.

1.4 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.

The oxygen content of a powder affects both its green and sintered properties.

Hydrogen loss is a term widely used in the powder metallurgy industry even though the measurement represents an approximate oxygen content of the powder.

Oxygen is the most common hydrogen-reducible constituent of metal powders and this procedure may be used as a measure of oxygen reducible under the test conditions if other interfering elements are absent.

1.1 This test method covers the determination of the mass of hydrogen-reducible constituents in the following metal powders: cobalt copper iron and tungsten.

1.2 This test method is useful for cobalt copper and iron powders in the range from 0.05 to 3.0 % oxygen and for tungsten powder in the range from 0.01 to 0.50 % oxygen.

1.3 This test method does not measure the oxygen contained in oxides such as silicon oxide (SiO₂) aluminum oxide (Al₂O₃) magnesium oxide (MgO) calcium oxide (CaO) titanium dioxide (TiO₂) etc. that are not reduced by hydrogen at the test temperatures.

1.4 For total oxygen content vacuum or inert gas fusion methods are available (see Test Methods E1019).

1.5 The values stated in SI units are to be regarded as the standard.

1.6 This standard does not purport to address all of the safety concerns if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

The purpose of this test method is to determine the amount of gangue refractory inert etc. materials that may adversely affect compacting tools and sintered properties of components formed from copper and iron powders.

The insoluble matter consists of those nonmetallic substances that do not dissolve in the mineral acid used to dissolve the metal. In copper powder which is treated with nitric acid the acid-insoluble matter includes silica insoluble silicates alumina clays and other refractory materials that may be introduced either as impurities in the raw material or from the furnace lining fuel etc.; lead sulfate may also be present. In iron powder which is treated with hydrochloric acid the insoluble matter may include carbides in addition to the substances listed above. The test method excludes insoluble material that is volatile at the ignition temperature specified.

1.1 This test method covers the determination of the mineral-acid-insoluble matter content of copper and iron powders in amounts under 1.0 %.

1.2 This standard does not purport to address all of the safety problems if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.