阅读说明：本技术 具有抗菌性的医用不锈钢及其制备方法 (Medical stainless steel with antibacterial property and preparation method thereof ) 是由 黄玉祥 于 2020-12-29 设计创作，主要内容包括：本发明属于不锈钢技术领域,具体涉及具有抗菌性的医用不锈钢及其制备方法,按重量百分比计,该不锈钢的化学成分如下：C:0.05—0.07、Mn：1-3、Cr:15—22、Ti：0.5—1、Mo：0.8—1,N：0.3—0.4、Cu：3—5、P＜0.03、S＜0.03、Ag：2-3,余量为铁,钢中杂质元素含量符合医用不锈钢国家标准中的相应要求,具有比较好的抗菌效果,满足医疗用途。(The invention belongs to the technical field of stainless steel, and particularly relates to antibacterial medical stainless steel and a preparation method thereof, wherein the stainless steel comprises the following chemical components in percentage by weight: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3-0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, the balance being iron, the content of impurity elements in the steel meeting the corresponding requirements in the national standard of medical stainless steel, having better antibacterial effect and meeting the medical use.)

1. The medical stainless steel with antibacterial property is characterized by comprising the following chemical components in percentage by weight: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3-0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, the balance being iron, the content of impurity elements in the steel meeting the corresponding requirements in the national standard of medical stainless steel.

2. The medical stainless steel with antibacterial property according to claim 1, wherein the chemical composition of the stainless steel is as follows by weight percent: c:0.05, Mn: 2. 22 parts of Cr, and Ti: 1. mo: 1. n: 0.4, Cu: 5. p is less than 0.03, S is less than 0.03, Ag: 3, and the balance of iron.

3. The medical stainless steel with antibacterial property according to claim 1, wherein the chemical composition of the stainless steel is as follows by weight percent: c:0.07, Mn: 3. 15 parts of Cr, and Ti: 1. mo: 1. n: 0.3, Cu: 3. p is less than 0.03, S is less than 0.03, Ag: 2, and the balance of iron.

4. The medical stainless steel with antibacterial property according to claim 1, wherein the surface of the stainless steel is covered with a TiO2 thin film.

5. The preparation method of the medical stainless steel with antibacterial property is characterized by comprising the following heat treatment steps:

step 1, preparing raw materials according to the following mixture ratio: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3 to 0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, and the balance of iron, wherein C, Mn, Cr, Ti, Mo, N, Cu, P, S are completely melted into molten steel, and then nitrogen is blown into the molten steel;

step 2, the molten steel in the step 1 is kept at 1000-1100 ℃ for 1-1.5 h to fully dissolve copper in the stainless steel, and then is cooled to room temperature to make the copper in the stainless steel in a supersaturated state; reheating the stainless steel to 680-780 ℃ and preserving heat for 4-5 hours to ensure that supersaturated copper precipitates sufficient copper-rich phase from the stainless steel, and the copper-rich phase is uniformly and dispersedly distributed in the stainless steel matrix;

step 3, heating the molten steel to 1050-1100 ℃ again, adding Ag, preserving heat for 2-3 h, cooling to room temperature, taking out the stainless steel, and then carrying out quenching treatment;

step 4, tempering the stainless steel treated in the step 3 for two times, and taking out the stainless steel after air cooling;

and 5, sputtering TiO2 on the surface of the stainless steel in a magnetron sputtering mode to form a TiO2 film.

Technical Field

The invention belongs to the technical field of stainless steel, and particularly relates to antibacterial medical stainless steel and a preparation method thereof.

Background

The stainless steel has the advantages of excellent obdurability, bending fatigue resistance, good processing performance, low cost and the like, and is widely applied to orthopedic implant products such as artificial joints (film surfaces, knee joints, shoulder joints, ankle joints, elbow joints, wrist joints, finger joints and the like), bone wound products (intramedullary nails, steel plates, screws and the like), spinal orthopedic internal fixation systems and the like, and medical instruments such as orthodontic products of oral orthodontic brackets (brackets, belt rings, orthodontic wires and implants for anchorage) and interventional therapy instrument products such as cardiovascular brackets and the like. 316L, 317L, 304, etc. are typical representatives of medical stainless steel. However, as a common postoperative complication, bacterial infection caused by medical instruments such as medical stainless steel has become one of the important problems to be solved in the medical field of the 21 st century. According to statistics, the annual incidence rate of the related infection of the American orthopedic implant reaches about 4.3 percent. According to the data in the handbook of infection control and prevention in hospitals issued by the World Health Organization (WHO), more than 1400 million people are suffering from nosocomial infections every day around the world, of which 60% of bacterial infections are related to the medical devices used. Postoperative infection of orthopedics and the like can directly cause the wound of a patient to be not healed for a long time, often can cause operation failure, even can cause complications such as chronic osteomyelitis and the like, not only brings great physical and mental pain and heavy economic burden to the patient, but also can cause negative effects of different degrees to hospitals, society and the like. Therefore, research and development of novel medical materials with the bacterial anti-infection function to eliminate or reduce bacterial infectious diseases caused by related medical instruments have important social and economic significance.

Disclosure of Invention

The technical problem to be solved by the invention is to provide medical stainless steel with antibacterial property and a preparation method thereof, aiming at the defects, the medical stainless steel has better antibacterial effect and meets medical application.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the medical stainless steel with antibacterial property comprises the following chemical components in percentage by weight: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3-0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, the balance being iron, the content of impurity elements in the steel meeting the corresponding requirements in the national standard of medical stainless steel.

Preferably, the stainless steel comprises the following chemical components in percentage by weight: c:0.05, Mn: 2. 22 parts of Cr, and Ti: 1. mo: 1. n: 0.4, Cu: 5. p is less than 0.03, S is less than 0.03, Ag: 3, and the balance of iron.

Preferably, the stainless steel comprises the following chemical components in percentage by weight: c:0.07, Mn: 3. 15 parts of Cr, and Ti: 1. mo: 1. n: 0.3, Cu: 3. p is less than 0.03, S is less than 0.03, Ag: 2, and the balance of iron.

Preferably, the surface of the stainless steel is covered with a TiO2 film.

The preparation method of the medical stainless steel with antibacterial property comprises the following heat treatment steps:

step 1, preparing raw materials according to the following mixture ratio: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3 to 0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, and the balance of iron, wherein C, Mn, Cr, Ti, Mo, N, Cu, P, S are completely melted into molten steel, and then nitrogen is blown into the molten steel;

step 2, the molten steel in the step 1 is kept at 1000-1100 ℃ for 1-1.5 h to fully dissolve copper in the stainless steel, and then is cooled to room temperature to make the copper in the stainless steel in a supersaturated state; reheating the stainless steel to 680-780 ℃ and preserving heat for 4-5 hours to ensure that supersaturated copper precipitates sufficient copper-rich phase from the stainless steel, and the copper-rich phase is uniformly and dispersedly distributed in the stainless steel matrix;

step 3, heating the molten steel to 1050-1100 ℃ again, adding Ag, preserving heat for 2-3 h, cooling to room temperature, taking out the stainless steel, and then carrying out quenching treatment;

step 4, tempering the stainless steel treated in the step 3 for two times, and taking out the stainless steel after air cooling;

and 5, sputtering TiO2 on the surface of the stainless steel in a magnetron sputtering mode to form a TiO2 film.

The invention has the beneficial effects that: by adopting the scheme, the copper element and the silver element are added into the stainless steel, and the preparation method is matched, and the rodlike or granular copper-rich precipitated phase is uniformly dispersed and distributed in the stainless steel matrix, so that the stainless steel is endowed with the function of resisting bacterial infection, and the addition of the silver component obtains the bactericidal and antibacterial effect, so that the novel medical stainless steel material has the broad-spectrum antibacterial function.

Detailed Description

Example 1: the medical stainless steel with antibacterial property comprises the following chemical components in percentage by weight: c:0.05, Mn: 2. 22 parts of Cr, and Ti: 1. mo: 1. n: 0.4, Cu: 5. p is less than 0.03, S is less than 0.03, Ag: 3, the balance of iron, the content of impurity elements in the steel meets the corresponding requirements in national standards of medical stainless steel, and the surface of the stainless steel is covered with a TiO2 film.

The preparation method of the medical stainless steel with antibacterial property is characterized by comprising the following heat treatment steps:

step 1, preparing raw materials according to the following mixture ratio: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3 to 0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, and the balance of iron, wherein C, Mn, Cr, Ti, Mo, N, Cu, P, S are completely melted into molten steel, and then nitrogen is blown into the molten steel;

step 2, the molten steel in the step 1 is kept at 1000-1100 ℃ for 1-1.5 h to fully dissolve copper in the stainless steel, and then is cooled to room temperature to make the copper in the stainless steel in a supersaturated state; reheating the stainless steel to 680-780 ℃ and preserving heat for 4-5 hours to ensure that supersaturated copper precipitates sufficient copper-rich phase from the stainless steel, and the copper-rich phase is uniformly and dispersedly distributed in the stainless steel matrix;

step 3, heating the molten steel to 1050-1100 ℃ again, adding Ag, preserving heat for 2-3 h, cooling to room temperature, taking out the stainless steel, and then carrying out quenching treatment;

step 4, tempering the stainless steel processed in the step 3 for two times, wherein in the two tempering, the first tempering is to heat the stainless steel workpiece to 680 ℃ and preserve heat for 6 hours, and the second tempering is to heat the stainless steel workpiece to 650 ℃ and preserve heat for 3 hours, and then the stainless steel is taken out after air cooling;

and 5, sputtering TiO2 on the surface of the stainless steel in a magnetron sputtering mode to form a TiO2 film.

The invention optimizes the composition proportion of the stainless steel, adds copper element and silver element in the stainless steel, and is matched with the preparation method, rod-shaped or granular copper-rich precipitated phases are uniformly and dispersedly distributed in a stainless steel matrix, thereby endowing the stainless steel with the function of bacterial infection resistance, the addition of the silver component obtains the sterilization and antibacterial action, and the silver component can release silver ions, so that the stainless steel has the antibacterial and bactericidal action and is a new medical stainless steel material with the broad-spectrum antibacterial function.

Example 2: the medical stainless steel with antibacterial property comprises the following chemical components in percentage by weight: c:0.07, Mn: 3. 15 parts of Cr, and Ti: 1. mo: 1. n: 0.3, Cu: 3. p is less than 0.03, S is less than 0.03, Ag: 2, the balance of iron, the content of impurity elements in the steel meets the corresponding requirements in national standards of medical stainless steel, and the surface of the stainless steel is covered with a TiO2 film.

Example 3: the medical stainless steel with antibacterial property comprises the following chemical components in percentage by weight: c, 0.05-0.07, Mn: 1-3, Cr: 15-22, Ti: 0.5-1, Mo: 0.8-1, N: 0.3-0.4, Cu: 3-5, P is less than 0.03, S is less than 0.03, Ag: 2-3, the balance being iron, the content of impurity elements in the steel meeting the corresponding requirements in national standards of medical stainless steel, and the surface of the stainless steel being covered with a TiO2 film.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.