CN109880677B - Method for enhancing antifriction lubricating property of polar lubricant - Google Patents
Method for enhancing antifriction lubricating property of polar lubricant Download PDFInfo
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- CN109880677B CN109880677B CN201910232368.3A CN201910232368A CN109880677B CN 109880677 B CN109880677 B CN 109880677B CN 201910232368 A CN201910232368 A CN 201910232368A CN 109880677 B CN109880677 B CN 109880677B
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Abstract
The invention discloses a method for enhancing the antifriction lubricating property of a polar lubricant. In a friction system, a piezoelectric material is used as a friction matrix, a polar molecule solution is used as a friction lubricating medium, an electric field generated by a load applied in the friction process is used for attracting polar molecules in the solution, and a molecular film with an anti-friction effect is formed on the friction surface, so that the anti-friction performance of the lubricant is enhanced. The invention utilizes polar molecules in natural synovial fluid to absorb impact load in the daily walking process, achieves the synergistic effect between the piezoelectric ceramic joint and the joint synovial fluid, and achieves the purpose of enhancing the antifriction lubricating property of the polar lubricant.
Description
Technical Field
The invention belongs to the field of biological friction, and particularly relates to a method for enhancing the antifriction lubricating property of a polar lubricant.
Background
With the increasing number of people with joint diseases, the demand for artificial joints is increasing, for example, the annual growth rate of the demand can reach 7-8% (developed countries) counting medical articles implanted in vivo, while China is a developing large country with 14 hundred million people and the population base of medical care services is large. According to the report of the Ministry of politics, about 1500 more than ten thousand patients with only unrestrained limbs in China exist, and the disability is about 780 ten thousand. In the past, over 300 million amputations have been due to the lack of reconstructive surgery and materials. The statistical data show that the acceleration of the development and research of the artificial joint by using the modern technology has important practical significance.
However, because the wear resistance of the current medical artificial joint is poor, the service life of the joint is only about 20 years, which is far shorter than the 70 years service life of the natural joint, and the tribological performance of the artificial joint in the service process can not be used for a long time.
Disclosure of Invention
The invention provides a method for enhancing the antifriction lubricating property of a polar lubricant, aiming at the problem that the service life is shortened due to the fact that the artificial joint is seriously abraded in the prior art.
The technical scheme for realizing the purpose of the invention is as follows:
a method for enhancing the antifriction lubricating property of polar lubricant comprises the following specific steps:
step 1: selecting a piezoelectric material with mechanical strength (the breaking strength is more than 50Mpa) and a piezoelectric constant more than 200C/N as a friction matrix;
step 2: preparing a macromolecular solution with polarity or a solution capable of decomposing high molecular weight ionic groups in the solution as a lubricating medium;
and step 3: selecting a conventional artificial joint pair abrasive material to form a friction system;
and 4, step 4: selecting the load and the friction speed which accord with the natural joint of the human body;
and 5: and (4) performing a friction experiment under the load and the friction speed of the step (4) by using the piezoelectric ceramic as a matrix and using the polar molecule solution as a lubricating solution.
Further, the lubricating medium includes a betaine solution, a phosphorylcholine solution, or a poly (7-norbornene-2-carboxylic acid monosodium salt) solution.
Further, in step 3, the counter-grinding material of the artificial joint friction pair comprises a ceramic counter-grinding material, a polymer counter-grinding material, a cobalt-chromium-molybdenum alloy metal counter-grinding material or an aluminum alloy metal counter-grinding material.
Further, in step 4, according to the state of the natural joints of the human body in daily life, the applied load is 2-5N, and the friction speed is 0.005-0.01 m/s.
Compared with the prior art, the invention has the following remarkable advantages:
1. the polar molecules in the natural synovial fluid are used for absorbing impact load in the daily walking process, so that the synergistic effect between the piezoelectric ceramic joint and the joint synovial fluid is achieved, and the anti-friction lubricating performance of the polar lubricant is enhanced; 2. the invention reasonably utilizes the fluctuating impact load effect of the human body joint in the motion process, and absorbs the kinetic energy generated in the natural walking process and converts the kinetic energy into the electric field energy capable of absorbing polar molecules; when the adsorbed molecules are abraded off by the contact surface due to friction, the molecular film on the friction surface is reformed due to the electric field generated again, so that the effect of dynamic film forming is achieved, and the effect of reducing abrasion can be well obtained.
Drawings
FIG. 1 is a schematic diagram of a simulation of the method of the present invention.
Fig. 2 is a comparison of the friction process and the normal friction process in the method of the present invention, wherein a is a schematic diagram of the normal friction process and b is a schematic diagram of the friction process of the present invention.
FIG. 3 is a graph of the molecular formula of betaine.
Fig. 4 is a graph showing the results of the friction test.
FIG. 5 is a graph showing the results of the coefficient of friction.
FIG. 6 is a graph comparing wear rates after the rubbing test.
Detailed Description
The present invention will be described in more detail with reference to the following examples and the accompanying drawings.
Example 1
(1) Selecting
The barium titanate piezoelectric ceramic plate is used as a friction substrate, and the piezoelectric coefficient d of the barium titanate piezoelectric ceramic plate is measured33Is 300 pC/N;
(2) performing electrode removing treatment on the upper surface and the lower surface of the piezoelectric ceramic piece, polishing the positive electrode surface of the piezoelectric ceramic piece, finally measuring the surface roughness to be 0.1 mu m, and performing embedding treatment on the piezoelectric ceramic piece to keep the surface to be polished outside;
(3) selecting betaine (DMMPPS) with polarity to prepare a solution with the concentration of 0.5mol/L to be used as a lubricating medium;
(4) selecting SiN ceramic balls as counter-grinding materials, wherein the diameter of each ball is 4mm, and the roughness is 0.1 mu m (Ra);
(5) the applied load was selected to be 2N and the friction speed was 0.0075m/s, and the friction performance test was performed. FIG. 3 shows the molecular formula of betaine.
Example 2
(1) Selecting
Barium titanate piezoelectric ceramic pieceAs a friction matrix, the piezoelectric coefficient d is measured33Is 300 pC/N;
(2) performing electrode removing treatment on the upper surface and the lower surface of the piezoelectric ceramic piece, grinding and polishing the negative electrode surface of the piezoelectric ceramic piece to finally measure that the surface roughness is 0.1 mu m, and performing embedding treatment on the piezoelectric ceramic piece to keep the surface to be ground outside;
(3) selecting betaine (DMMPPS) with polarity to prepare a solution with the concentration of 0.5mol/L to be used as a lubricating medium;
(4) selecting SiN ceramic balls as counter-grinding materials, wherein the diameter of each ball is 4mm, and the roughness is 0.1 mu m (Ra);
(5) the applied load was selected to be 2N and the friction speed was 0.0075m/s, and the friction performance test was performed.
Example 3
(1) Selecting
The barium titanate piezoelectric ceramic plate is used as a friction substrate, and the piezoelectric coefficient d of the barium titanate piezoelectric ceramic plate is measured33Is 300 pC/N;
(2) performing electrode removing treatment on the upper surface and the lower surface of the piezoelectric ceramic sheet, and grinding and polishing the surface to be rubbed to finally measure the surface roughness to be about 0.1 mu m; and (4) carrying out embedding treatment on the piezoelectric ceramic piece, and keeping the surface to be ground outside.
(3) Deionized water without polarity was selected as the lubricating solution.
(4) Selecting SiN ceramic balls as counter-grinding materials, wherein the diameter of each ball is 4mm, and the roughness is 0.1 mu m (Ra);
(5) the applied load was selected to be 2N and the friction speed was 0.0075m/s, and the friction performance test was performed.
Example 4
(1) Selecting
The common electric ceramic plate is used as a friction substrate;
(2) grinding and polishing the surface to be rubbed, and finally measuring the surface roughness to be about 0.1 mu m; embedding the piezoelectric ceramic plate, and keeping the surface to be ground outside;
(3) selecting betaine (DMMPPS) with polarity to prepare a solution with the concentration of 0.5mol/L to be used as a lubricating medium;
(4) selecting SiN ceramic balls as counter-grinding materials, wherein the diameter of each ball is 4mm, and the roughness is 0.1 mu m (Ra);
(5) the applied load was selected to be 2N and the friction speed was 0.0075m/s, and the friction performance test was performed.
The results of the coefficients of friction for examples 1, 2 and 4 are shown in FIG. 4.
The coefficient of friction results for example 3 are shown in fig. 5.
The wear rates of examples 1, 2 and 3 after the rubbing test are shown in fig. 6.
Conclusion
As can be seen from the results of the friction test in fig. 4, the friction coefficient was the lowest, about 0.15, when the negative electrode face of the barium titanate piezoelectric ceramic was used as the friction substrate, and about 0.18 when the ordinary ceramic was used as the friction substrate. And as can also be seen from the comparison of the wear rates in fig. 6, the wear rate corresponding to the negative electrode surface of the barium titanate piezoelectric ceramic as the friction matrix is also the lowest.
It can be deduced that, because the betaine molecules have polarity as shown in fig. 3 and the groups with positive electricity are large, the betaine molecules are adsorbed to the negative electrode surface of the piezoelectric ceramic with a negative electric field on the surface during the rubbing process, so that the abrasion during the rubbing process is reduced, and the principle is shown in fig. 2. Therefore, under the synergistic action of the friction matrix and the polar lubricating solvent, the combined method can achieve the purpose of enhancing the antifriction effect of the lubricant.
Claims (6)
1. A method for enhancing the antifriction lubricating property of a polar lubricant is characterized in that in a friction system, a piezoelectric material is used as a friction matrix, a polar molecule solution is used as a friction lubricating medium, an electric field generated by a load applied in the friction process is used for attracting polar molecules in the solution, a molecular film with the antifriction effect is formed on the friction surface, and the antifriction lubricating property of the lubricant is enhanced;
the method comprises the following specific steps:
step 1: selecting a piezoelectric material as a friction matrix;
step 2: preparing a macromolecular solution with polarity or a solution capable of decomposing high molecular weight ionic groups in the solution as a lubricating medium;
and step 3: selecting artificial joint pair grinding materials to form a friction system;
and 4, step 4: selecting the load and the friction speed which accord with the natural joint of the human body;
and 5: and (4) taking the piezoelectric ceramic as a matrix and the polar molecular solution as a lubricating solution, and rubbing under the load and the rubbing speed in the step (4) to form a molecular film with the anti-friction effect.
2. The method of enhancing the antifriction lubricating property of a polar lubricant according to claim 1, wherein in step 1, the piezoelectric material comprises BT-based piezoelectric ceramics and BNT-based piezoelectric ceramics having a piezoelectric constant of more than 200C/N and ferroelectric properties.
3. The method of enhancing the friction reducing lubricating property of a polar lubricant according to claim 1, wherein the friction matrix material has a breaking strength of greater than 50Mpa in step 1.
4. The method of enhancing the antifriction lubricating property of a polar lubricant according to claim 1, wherein in step 2 the lubricating medium comprises a betaine solution, a choline phosphate solution, or a solution of poly (7-norbornene-2-carboxylic acid monosodium salt).
5. The method of claim 1, wherein in step 3, the counter-wear material of the friction pair of the artificial joint comprises a ceramic counter-wear material, a polymer counter-wear material, a cobalt-chromium-molybdenum alloy metal counter-wear material or an aluminum alloy metal counter-wear material.
6. The method of claim 1, wherein in step 4, the load is applied at 2 to 5N and the friction rate is 0.005 to 0.01m/s, depending on the state of the natural joints of the human body in daily life.
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| CN1806776A (en) * | 2005-12-16 | 2006-07-26 | 清华大学 | Bi-directional digital wireless pressure monitoring system for biology implantation joint |
| CN101368664A (en) * | 2007-08-16 | 2009-02-18 | 通用汽车环球科技运作公司 | Active material based bodies for varying frictional force levels at the interface between two surfaces |
| CN105505552A (en) * | 2014-10-20 | 2016-04-20 | 中国石油化工股份有限公司 | Method and device for changing lubricating performance between interfaces |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1806776A (en) * | 2005-12-16 | 2006-07-26 | 清华大学 | Bi-directional digital wireless pressure monitoring system for biology implantation joint |
| CN101368664A (en) * | 2007-08-16 | 2009-02-18 | 通用汽车环球科技运作公司 | Active material based bodies for varying frictional force levels at the interface between two surfaces |
| CN105505552A (en) * | 2014-10-20 | 2016-04-20 | 中国石油化工股份有限公司 | Method and device for changing lubricating performance between interfaces |
Non-Patent Citations (2)
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| 人工关节内锆钛酸铅压电陶瓷供能与电路设计;陈虹等;《清华大学学报(自然科学版)网络.预览》;20071130;第48卷(第01期);第128-131页 * |
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