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Nitriding CoCrMo alloy and smelting process thereof

An alloy and process technology, which is applied in the field of CoCrMo alloy and its smelting process, can solve the problems of limited nitrogen ion implantation thickness, difficulty in meeting the requirements of the permeated layer, and high cost of surface nitriding, so as to improve the surface hardness and wear resistance. Low, wear resistance improvement effect

Inactive Publication Date: 2019-04-26
江苏奇纳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most studied method is N ion implantation, which forms a hard nitride implant layer on the surface of CoCrMo alloy to improve wear resistance and reduce the release of harmful ions. However, the thickness of nitrogen ion implantation is limited. Prosthesis, the thickness of the permeable layer formed is difficult to meet the requirements
At the same time, the process is cumbersome and complicated, and the cost of surface nitriding is relatively high

Method used

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  • Nitriding CoCrMo alloy and smelting process thereof
  • Nitriding CoCrMo alloy and smelting process thereof
  • Nitriding CoCrMo alloy and smelting process thereof

Examples

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Effect test

Embodiment approach 1

[0023] This embodiment provides a nitrogen-increased CoCrMo alloy and its melting process, which is composed of the following components in weight percentage: C: 0.3%, Cr: 29%, Mo: 6%, Si: 0.9%, Mn: 0.4% , N: 0.25%, Co: 63.15%.

[0024] The above-mentioned CoCrMo alloy is prepared through the following process steps:

[0025] S1: After measuring C, Co, Mo, Si, Mn, and CrN according to the above weight percentages, add them into the crucible of the vacuum melting furnace in layers, and sandwich C in the middle;

[0026] S2: Vacuumize the vacuum melting furnace, stop the pump and fill nitrogen to 20000pa when the vacuum degree reaches 20pa;

[0027] S3: Adjust the power of the vacuum melting furnace to 80kw to heat the mixed raw materials for 20mim, then increase the power to 150kw to heat the mixed raw materials for 20mim, then increase the power to 250kw to heat the mixed raw materials for 20mim; finally increase the power Up to 350kw to heat the mixed raw materials for 20mi...

Embodiment approach 2

[0034] This embodiment provides a nitrogen-increased CoCrMo alloy and its melting process, which is composed of the following components in weight percentage: C: 0.27%, Cr: 28%, Mo: 5%, Si: 0.8%, Mn: 0.35% , N: 0.2%, Co: 65.38%.

[0035] The preparation process of the above-mentioned CoCrMo alloy is completely the same as that of Embodiment 1, and will not be repeated here.

Embodiment approach 3

[0037]This embodiment provides a nitrogen-increased CoCrMo alloy and its melting process, which is composed of the following components in weight percentage: C: 0.25%, Cr: 30%, Mo: 7%, Si: 0.85%, Mn: 0.3% , N: 0.19%, Co: 61.41%.

[0038] The preparation process of the above-mentioned CoCrM alloy is completely the same as that of Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to the field of alloy smelting, and discloses a nitriding CoCrMo alloy and a smelting process thereof. The CoCrMo alloy mainly comprises following components including, by weightpercent, 0.25 to 0.31% of C, 27 to 30% of Cr, 5.0 to 7.0% of Mo, 0.75 to 0.92% of Si, 0.3 to 0.4% of Mn, 0.18 to 0.25% of N, and 64.12 to 66.51% of Co. According to the smelting process, vacuum is pumped in a vacuum furnace, and then nitrogen is inflated. Compared with the prior art, high-temperature gas nitriding smelting is adopted, medical CoCrMo alloy is subjected to high-temperature nitriding treatment, the content of austenite in a base body is increased, the microhardness is improved, the brine corrosion resistance is improved, the wear resistance is improved, alloy hardness and surface roughness after ionic nitriding are increased, the microhardness is obviously improved, and the anti-wear property is obviously improved.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a CoCrMo alloy and a smelting process thereof. Background technique [0002] CoCrMo alloy is a biocompatible material commonly used in medicine, and it began to be used in dentistry and biomedical fields in the early 1930s. CoCrMo alloys for casting are widely used in clinical and medical fields because their elastic modulus is similar to that of human bone tissue, and they have excellent mechanical properties, corrosion resistance and biocompatibility. Today, CoCrMo alloys are still considered to be the most reliable metal biomaterials. Compatible materials, due to their good mechanical properties, corrosion resistance and wear resistance, are widely used in surgical implants, cardiovascular stents, and dental restorations, and are also suitable for movable joints, but CoCrMo alloys are widely used in various human body Under the action of body fluids and secretions, it will be er...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C1/02
Inventor 周志坚杨华兴彭伟平金开锋
Owner 江苏奇纳新材料科技有限公司
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