Preparation method for medical cobalt chromium molybdenum alloy powder for laser 3D printing

A cobalt-chromium-molybdenum alloy, 3D printing technology, applied in additive processing and other directions, can solve the problems of difficult preparation of fine-grained powder, high content of oxygen and other impurities, and low powder yield.

Pending Publication Date: 2020-10-20
JINCHUAN GROUP LIMITED
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing medical cobalt-chromium-molybdenum alloy powder for laser 3D printing, so as to solve the existing problems of fine particle size powder preparation difficulty, low powder yield, high content of oxygen and other impurities, etc.

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  • Preparation method for medical cobalt chromium molybdenum alloy powder for laser 3D printing

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preparation example Construction

[0024] A preparation method for medical cobalt-chromium-molybdenum alloy powder for laser 3D printing, comprising the following steps:

[0025] Step 1. Put the cobalt-chromium-molybdenum alloy chemical raw material into a vacuum induction furnace for melting according to the ratio of GB 17100-1997. The melting temperature is controlled at 1300-1500°C. After melting, cast under vacuum to obtain a cobalt-chromium-molybdenum alloy rod;

[0026] Step 2. Using machining equipment, peel off the cobalt-chromium-molybdenum alloy bar stock obtained in step 1, and remove defective parts such as the head and tail at the same time to obtain an alloy bar stock of Ø90mm×(200-220)mm;

[0027] Step 3. Put the cobalt-chromium-molybdenum alloy rod obtained in step 2 into the argon atomization melting chamber, and then vacuumize the melting chamber to 5×10 -2 Below Pa, fill in high-purity argon to keep the pressure in the smelting chamber at 0.001-0.01MPa;

[0028] Step 4, heating the cobalt-ch...

Embodiment 1

[0033] Step 1, carry out batching according to the cobalt-chromium-molybdenum alloy chemical composition that GB 17100-1997 stipulates, by weight percentage, C: 0.28%, Cr: 27.6%, Mo: 5.5%, Ni: 0.80%, Fe: 0.55%, Mn: 0.75%, Si: 0.83%, Co: 63.69%, put the raw materials into the vacuum induction furnace for smelting, the smelting temperature is controlled at 1450°C, and after smelting, cast under vacuum to obtain cobalt-chromium-molybdenum alloy rods.

[0034] Step 2. Using machining equipment, peel off the cobalt-chromium-molybdenum alloy bar stock obtained in step 1, and remove defective parts such as head and tail at the same time to obtain an alloy bar stock of Ø90mm×200mm;

[0035] Step 3. Put the cobalt-chromium-molybdenum alloy rod obtained in step 2 into the argon atomization melting chamber, and vacuumize the melting chamber to 5×10 -2 Below Pa, refill high-purity argon to keep the pressure in the smelting chamber at 0.008MPa;

[0036] Step 4. Heating the cobalt-chromium...

Embodiment 2

[0043]Step 1, carry out batching according to the cobalt chromium molybdenum alloy chemical composition that GB 17100-1997 stipulates, by weight percentage, C: 0.25%, Cr: 28.6%, Mo: 5.3%, Ni: 0.75%, Fe: 0.68%, Mn: 0.77%, Si: 0.79%, Co: 62.86%, put the cobalt-chromium-molybdenum alloy chemical raw material into the vacuum induction furnace for smelting, the melting temperature is controlled at 1300°C, and the cobalt-chromium-molybdenum alloy bar is obtained by casting under vacuum after smelting;

[0044] Step 2. Using machining equipment, peel off the cobalt-chromium-molybdenum alloy bar stock obtained in step 1, and remove defective parts such as head and tail at the same time to obtain an alloy bar stock of Ø90mm×200mm;

[0045] Step 3. Put the cobalt-chromium-molybdenum alloy rod obtained in step 2 into the argon atomization melting chamber, and vacuumize the melting chamber to 5×10 -2 Below Pa, refill high-purity argon to keep the pressure in the smelting chamber at 0.001M...

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Abstract

The invention discloses a preparation method for medical cobalt chromium molybdenum alloy powder for laser 3D printing and belongs to the technical field of preparation of alloy powder for 3D printing. According to the technical scheme, the preparation method comprises the steps of burdening smelting, vacuumizing, argon filling, preparation of cobalt chromium molybdenum alloy liquid, forming of alloy powder through atomization, preparation of cobalt chromium molybdenum alloy fine powder of the grain size smaller than or equal to 53 [mu]m through vibratory screening and airflow classification of ultrafine grains. Aiming at characteristics of laser 3D printing technology, the prepared medical cobalt chromium molybdenum alloy powder has the characteristics of being uniform in chemical components, low in oxygen content, high in sphericity degree, low in hollow sphere rate and good in liquidity, and special requirements of the laser 3D printing technology for powder performance are met. Theprepared medical cobalt chromium molybdenum alloy powder for laser 3D printing is high in fine powder yield, the yield of the powder of the grain size smaller than or equal to 53 [mu]m reaches 80% orabove, finally the yield of qualified powder (of the grain size between 15 and 53 [mu]m) reaches 50% or above, and production cost is lowered effectively.

Description

technical field [0001] The invention belongs to the technical field of preparation of alloy powder for 3D printing, and in particular relates to a preparation method of medical cobalt-chromium-molybdenum alloy powder for laser 3D printing. Background technique [0002] Medical cobalt-chromium-molybdenum alloy has excellent mechanical properties, corrosion resistance and biocompatibility, and is an important material for orthopedic metal implants. Generally speaking, the production process of medical cobalt-chromium-molybdenum alloy can be divided into two methods: casting and forging. In the application of medical individual customization, due to the particularity and irregularity of the final product shape required, the cost of precision forging molds is too high. High, before the casting method was used for preparation. In recent years, with the rapid development of metal 3D printing technology, the personalized customization of medical implants has become possible and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08C22C19/07B33Y70/00
CPCB22F9/082B33Y70/00B22F2009/0824B22F2009/0844B22F2009/0848B22F2009/0892
Inventor 樊昱张东张新涛张鹏李娟吕清华陈兴纲周志鸿陆斌刚
Owner JINCHUAN GROUP LIMITED
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