阅读说明：本技术 一种不锈钢对称功能梯度生物复合材料 (Stainless steel symmetric functional gradient biological composite material ) 是由 陈风华 于 2018-07-04 设计创作，主要内容包括：为了改善粉末冶金零件的硬度、耐磨性,设计了一种不锈钢对称功能梯度生物复合材料。采用316L气雾化不锈钢粉末为原料,经过配料、球磨、干燥、制粒、成形、球磨工艺成功制备了具有优异力学性能的汽车用粉末冶金不锈钢零件。其中,所述的不锈钢对称功能梯度生物复合材料,通过控制HA粉末的含量在20%~40%之间时,所得复合材料的抗弯强度和弹性模量分别与人体骨的抗弯强度和弹性模量相匹配,得到生物力学相容性好的复合材料。所述的不锈钢对称功能梯度生物复合材料,界面结合紧密,所得生物材料符合功能梯度材料的设计要求。本发明能够为制备高性能的生物复合材料提供一种新的生产工艺。(The stainless steel symmetric functional gradient biological composite material HAs the advantages that the bending strength and the elastic modulus of the obtained composite material are respectively matched with the bending strength and the elastic modulus of human bones when the content of HA powder is controlled to be 20% ~ 40%, so that the composite material with good biomechanical compatibility is obtained.)

1. The preparation raw materials of the stainless steel symmetrical functional gradient biological composite material comprise: 316L of gas atomized stainless steel powder.

2. The stainless steel symmetric functionally graded biocomposite material of claim 1, wherein the preparation of the stainless steel symmetric functionally graded biocomposite material comprises the steps of: weighing and proportioning original powder according to an experimental design scheme, pouring the weighed and proportioned powder into a ball mill for wet milling, after the ball mill is finished, carrying out vacuum drying on the prepared granules, then adding a forming agent for granulation, adding the prepared powder into a hot press for hot pressing, wherein the pressing pressure is 50MPa, the heat preservation time is 300min, then putting the powder into a vacuum sintering furnace for sintering, the sintering temperature is 1350 ℃, and the heat preservation time is 60 min.

3. The stainless steel symmetric functionally graded biocomposite material of claim 1, wherein the detection step of the stainless steel symmetric functionally graded biocomposite material is: the bending strength and the elastic modulus of 3 HA/316L stainless steel symmetrical functional gradient biological composite material samples with the same components are tested on a CSS-44100 universal testing machine by a three-point bending method, a MASTER2000 particle size analyzer is adopted for particle size analysis, a Leica metallographic microscope is adopted for observation of microstructures, a DH100 type micro Vickers hardness tester is adopted for testing the hardness, the tensile property is tested on a CM510 type universal testing machine, the fracture appearance is observed by a scanning electron microscope, and a D8 type X-ray diffractometer is adopted for phase analysis.

4. The stainless steel symmetric functionally graded biocomposite material of claim 1, wherein the composite material HAs flexural strength and elastic modulus respectively matched with those of human bone by controlling the HA powder content to 20% ~ 40%, the composite material HAs good biomechanical compatibility, and the composite material HAs macroscopically obvious gradient and microscopically continuous change of components, and the components are uniformly distributed and dispersed, and the gradient layers have no obvious macroscopic interface, obvious defects and cracks, and the like.

Technical Field

The invention relates to a powder metallurgy material, in particular to a stainless steel symmetrical functional gradient biological composite material.

Background

The gradient composite material adopts advanced material composite technology, and is a heterogeneous material which is continuously changed in gradient from one side to the other side by controlling the elements (composition, structure and the like) of the constituent materials. The inner part of the structure can reach the condition that the interface disappears, the property and the function of the structure present gradient change corresponding to the change of the composition and the structure, and the performance mismatching factors of the combination part can be reduced and overcome. The preparation method comprises two main categories of phase distribution control and particle arrangement technology, including physical vacuum coating, chemical vapor deposition, particle arrangement sintering, plasma spraying, film lamination, self-propagating high-temperature synthesis and the like, and has certain potential application prospect in the fields of nuclear energy, electronics, optics, chemistry, electromagnetism and biomedicine and even daily life.

Stainless steel is short for stainless acid-resistant steel, and steel grade which is resistant to weak corrosive media such as air, steam and water or has stainless property is called stainless steel. Stainless steel is often classified into: martensitic steel, ferritic steel, austenitic-ferritic (duplex) stainless steel, precipitation hardening stainless steel, and the like. The addition of molybdenum further improves atmospheric corrosion, particularly corrosion resistance to chloride-containing atmospheres.

Disclosure of Invention

The invention aims to improve the hardness and the wear resistance of powder metallurgy parts and designs a stainless steel symmetrical functional gradient biological composite material.

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

the preparation raw materials of the stainless steel symmetrical functional gradient biological composite material comprise: 316L of gas atomized stainless steel powder.

The preparation method of the stainless steel symmetrical functional gradient biological composite material comprises the following steps: weighing and proportioning the original powder according to an experimental design scheme, and pouring the weighed and proportioned powder into a ball mill for wet grinding. After the ball milling is finished, the prepared granules are dried in vacuum, and then a forming agent is added for granulation. And adding the prepared powder into a hot press for hot pressing, wherein the pressing pressure is 50MPa, the heat preservation time is 300min, and then putting the powder into a vacuum sintering furnace for sintering, the sintering temperature is 1350 ℃, and the heat preservation time is 60 min.

The detection steps of the stainless steel symmetrical functional gradient biological composite material are as follows: the bending strength and the elastic modulus of 3 HA/316L stainless steel symmetrical functional gradient biological composite material samples with the same components are tested on a CSS-44100 universal testing machine by a three-point bending method. The particle size analysis adopts a MASTER2000 particle size analyzer, the microstructure is observed by a Leica metallographic microscope, the hardness is tested by a DH100 type micro Vickers hardness tester, the tensile property is tested by a CM510 type universal tester, the fracture morphology is observed by a scanning electron microscope, and the phase analysis is analyzed by a D8 type X-ray diffractometer.

According to the stainless steel symmetric functional gradient biological composite material, when the content of HA powder is controlled to be 20% to ~ 40%, the bending strength and the elastic modulus of the obtained composite material are respectively matched with the bending strength and the elastic modulus of human bones, and the composite material with good biomechanical compatibility is obtained.

The stainless steel symmetric functionally graded biological composite material has obvious gradient macroscopically, continuous change microscopically, and uniform and dispersed distribution of components; the gradient layers have no obvious macroscopic interfaces and obvious defects, cracks and the like.

The stainless steel symmetrical functional gradient biological composite material has two phases uniformly distributed in each gradient layer and at the interface, and the interface is tightly combined. The obtained biological material meets the design requirements of the functionally graded material.

The invention has the beneficial effects that:

316L gas atomization stainless steel powder is used as a raw material, and the stainless steel symmetrical functionally gradient biological composite material with excellent mechanical property is successfully prepared through the processes of material preparation, ball milling, drying, granulation, forming and ball milling. Wherein, the bending strength and the elastic modulus of the developed stainless steel symmetric functional gradient biological composite material are respectively matched with the strength and the modulus of human bones, and the composite material with good biomechanical compatibility is obtained; the HA/316L stainless steel composite material HAs natural transition among all gradient layers, no obvious macroscopic interface, defect, crack and the like, the two phases inside and at the interface of the gradient layers are uniformly distributed, all components are in continuous gradient distribution, and the interface is tightly combined. The invention can provide a new production process for preparing the high-performance stainless steel symmetrical functionally-graded biological composite material.

Detailed Description