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Method for measuring oxygen content in iron powder

A technology of oxygen content and measurement method, applied in the field of measurement, can solve the problems of high cost, rust, easy damping of iron powder, etc., and achieve the effect of convenient operation and economical operation.

Active Publication Date: 2014-01-22
ZHEJIANG QUZHOU YONGFENG METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The components and materials required for the hydrogen loss test device include gas-tight tubes, electric heating furnaces, temperature measurement systems and hydrogen gas. Since special devices and professional experimenters are required, the cost is high, time-consuming and labor-intensive, so general manufacturers do not no such device
Even if the iron powder manufacturer has such devices and relevant personnel to test and verify that the iron powder is qualified before leaving the factory, since the iron powder is easily exposed to moisture or rain during transportation, storage, and processing, it will rust and generate iron oxide. Oxygen content in iron powder exceeds standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The batch number 1211147 Jiande Yitong 300W water atomized iron powder purchased on November 24, 2012 was tested, and the result was that the oxygen content was 0.04%. Conform to the standard: oxygen content <0.2% (executive standard: Q / YTJ001-2009), the specific steps are as follows:

[0015] (1) Take a bag of iron powder (1 ton) and sample three places, weigh 50g each, and then mix according to the ratio: graphite powder 0.5g, iron powder 49.5g.

[0016] (2) After mixing, weigh 1.000g on a precision balance, and measure the carbon content on a carbon and sulfur analyzer: 0.630%, 0.560%, and 0.595%

[0017] Average X 1 =(0.630%+0.560%+0.595%)÷3=0.595%

[0018] Carbon segregation=0.630%-0.595%=0.035%, carbon segregation is within 0.1%, qualified.

[0019] (3) Put the three groups of mixed powder into the mold respectively, and press it into a green compact with a diameter of φ20 and a height of 15mm on a material testing machine.

[0020] (4) Sintering in...

Embodiment 2

[0024] Example 2: 13 tons of 100-mesh reduced iron powder purchased on November 28, 2012 without the name of the manufacturer was tested, and the result was that the oxygen content was 0.676%. According to the national standard GB / T4136-1994: the oxygen content of the brand FHY100.25 reduced iron powder is less than 0.3%, and this batch of iron powder seriously exceeds the standard. The specific steps are as follows:

[0025] (1) Take a bag of iron powder (1 ton) and sample three places, weigh 50g each, and then mix according to the ratio: graphite powder 0.5g, iron powder 49.5g.

[0026] (2) After mixing, weigh 1.000g on a precision balance, and measure the carbon content on a carbon and sulfur analyzer: 0.720%, 0.700%, and 0.650%

[0027] Average X 1 =(0.720%+0.700%+0.650%)÷3=0.690%

[0028] Carbon segregation=0.720%-0.690%=0.03%, carbon segregation is within 0.1%, qualified.

[0029] (3) The three groups of mixed powders were put into the mold respectively, and pressed i...

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PUM

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Abstract

The invention discloses a method for measuring oxygen content in iron powder. The method comprises the following steps: preparing testing materials, manufacturing a pressed blank, sintering, measuring and calculating the oxygen content. The method needs no relevant professional operators, and only ordinary instruments such as a material testing machine, a sintering furnace, a carbon sulfur analyzer and the like in a powder metallurgy plant need to be adopted, so that the method is convenient to operate and economic and practical. Oxygen content standard exceeding in iron powder can be effectively detected at any time, so that the phenomenon that relevant property of a final product is reduced is prevented; the invention disclose a novel testing method which is beneficial to study on oxygen content measurement in iron powder.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method for oxygen content in iron powder. Background technique [0002] In the field of powder metallurgy, if the oxygen content in the iron powder exceeds the standard, the sintered product will be decarburized during the sintering process, resulting in loose interior of the product, increased size and poor mechanical strength. The required hardness cannot be achieved after the heat treatment process due to the loss of carbon. In general, the determination of excessive oxygen content in iron powder is particularly important for powder metallurgy. If the powder metallurgy manufacturer does not detect the oxygen content of the incoming raw material iron powder, once the iron powder with excessive oxygen content is put into production, the Quality defects can only be found after sintering and quenching, so that they cannot be reworked in batches and scrapped, which not only wastes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/20
Inventor 杨胜上
Owner ZHEJIANG QUZHOU YONGFENG METAL PROD
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