Method for preparing globular high-nitrogen stainless steel powder using with high-energy ball mill

A high-energy ball mill and ball mill technology, applied in the field of alloy powder preparation, can solve the problems of poor powder formability, complex equipment, high cost, etc., and achieve the effect of high sphericity, simple equipment, and low cost

Inactive Publication Date: 2008-02-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nearly spherical high-nitrogen stainless steel powder by high-energy ball milling to solve the problems of complex equipment, high cost and poor powder formability in the production process of high-nitrogen stainless steel

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  • Method for preparing globular high-nitrogen stainless steel powder using with high-energy ball mill
  • Method for preparing globular high-nitrogen stainless steel powder using with high-energy ball mill

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Embodiment Construction

[0014] Raw materials: Fe powder (-300 mesh) 685 grams, Cr powder (-300 mesh) 170 grams, Mn powder (-300 mesh) 110 grams, Mo powder (-300 mesh) 35 grams.

[0015] Mix the above-mentioned raw material powders together with Φ7mm quenched steel balls and put them into the ball mill tank of the stirring high-energy ball mill. The rotating speed is 400r / min. In order to observe the changing law of the powder during the high-energy ball milling process and prevent the temperature in the spherical tank from being too high, the ball milling process is adopted to stop and cool for 2 hours every 12 hours of ball milling. After a specific time of ball milling, the ball milling tank is opened to take 10-20 grams of powder for nitrogen content detection. And morphology observation, the relationship between the nitrogen content of the powder obtained by ball milling and time is shown in Figure 1, the two are approximately linear, which makes it possible to accurately control the nitrogen con...

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Abstract

The present invention relates to a method for producing the nearly-round high-nitrogen stainless steel powders, belonging to the alloy-powder fabrication technology field. The technical characteristics of the method are that: first, the powders composed of Fe, Cr, Mn, and Mo elementsare weighed in accordance with the mass fractions; wherein Cr: 16 to 17, Mn: 10 to11, Mo: 3.0 to 3.5, while the surplus belonged to Fe; then the powders are mixed evenly and are poured into a stirring-type high-energy ball mill to be grinded for 12 to 96 hours. During the period, the ball-grinding atmosphere is the flowing nitrogen high in purity, whereas every 12 hours the ball needs be stopped for 2 hours to cool down. The present invention has the advantages that the stainless steel powders rich in nitrogen and with fine particles and even components can be produced; moreover, the stainless steel powders have high sphericity and good fluidity, which are favorable for following process of injection molding. The present invention has simple facility, easy control of the process parameters and low cost.

Description

Technical field: [0001] The invention belongs to the technical field of alloy powder preparation, and in particular provides a method for preparing near-spherical high-nitrogen stainless steel powder by high-energy ball milling. Background technique: [0002] High-nitrogen stainless steel is a kind of resource-saving advanced material. It replaces nickel with nitrogen, which can effectively save nickel resources. Effectively improve the local corrosion resistance of stainless steel (such as intergranular corrosion, pitting corrosion and crevice corrosion, etc.). In addition, the nickel-free or low-nickel composition characteristics of this type of stainless steel also reduce the harm of "nickel allergy" to human organs when nickel-containing stainless steel is used as biomedical materials (such as human implants, orthopedic brackets, etc.), Therefore, research on high-nitrogen stainless steel is of great significance in the fields of industry and medical surgery. (Uggowitz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 曲选辉崔大伟贾成厂何新波
Owner UNIV OF SCI & TECH BEIJING
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