CN105017696A - PTFE-based composite with friction magnetization characteristics regulated through change of multiple filler components - Google Patents
PTFE-based composite with friction magnetization characteristics regulated through change of multiple filler components Download PDFInfo
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- CN105017696A CN105017696A CN201510387816.9A CN201510387816A CN105017696A CN 105017696 A CN105017696 A CN 105017696A CN 201510387816 A CN201510387816 A CN 201510387816A CN 105017696 A CN105017696 A CN 105017696A
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Abstract
The present invention discloses a PTFE-based composite with friction magnetization characteristics regulated through change of multiple filler components. PTFE known as "the king of plastics" with excellent chemical stability and corrosion resistance is used as a substrate, multiple ferromagnetic fillers (fe-co, fe-ni, co-ni) are compoundly added into the substrate according to a mass proportion, and mechanical blending, cold pressing forming and sintering methods are used to prepare the PTFE-based composite comprising multiple ferromagnetic fillers. The composite provided by the present invention has an excellent tribology property, friction magnetization can be regulated through change of multiple ferromagnetic filler components so as to adjust the wear debris transfer ability. A transfer film with a stable property and high reliability can be formed at a friction interface. The composite may be made into parts that move relative to a transmission mechanism, such as gears, sliding bearings, rolling bearing retainers and the like and sliding friction reducing parts, and may be applied to fields of mechanics, electronics, aerospace and so on.
Description
Technical field
The present invention relates to technical field of composite materials, particularly relate to a kind of PTFE based composites utilizing polynary filler component to change regulation and control friction magnetization characteristic.
Background technology
Tetrafluoroethylene (PTFE) has good chemical stability and thermostability, is the superior self-lubricating material of a kind of corrosion resistance nature, is widely used in the field such as aerospace and national defense industry.Although PTFE has more excellent properties, also there is the shortcomings such as self-strength is low, wear resistance, creep resistance and heat conductivility difference, especially wear resisting property is poor.Usually need to utilize metallic stuffing, mineral filler, organic filler etc. to carry out filling-modified, improve its wear resistance, the method has obtained large-scale application, but the PTFE based composites aspect utilizing polynary filler component to change regulation and control friction magnetization characteristic waits to strengthen.
Summary of the invention
The present invention proposes a kind of PTFE based composites utilizing polynary filler component to change regulation and control friction magnetization characteristic, products obtained therefrom frictional coefficient is little, wear resistance is good, can by polynary ferromagnetic filler content in regulation and control matrix material, regulated and controled the matrix material self-excitation specific magnetising moment in friction process, utilize the friction magnetization produced in friction process to regulate and control the transfer ability of abrasive dust thus the tribological property of regulation and control ptfe composite, reach the top condition needed for friction.
Technical solution problem of the present invention, adopts following technical scheme:
What the present invention proposed utilizes polynary filler component to change the PTFE based composites of regulation and control friction magnetization characteristic, and its feature is: each raw material of described matrix material by the proportioning of mass percent is:
Polynary ferromagnetic filler 1-35%;
PTFE 65-99％；
Described polynary ferromagnetic filler is mixed in any proportion by least two kinds in iron, cobalt and nickel to form.
Preferably, each raw material of described matrix material by the proportioning of mass percent is: polynary ferromagnetic filler 1-25wt%, tetrafluoroethylene 75-99wt%.
More preferably, each raw material of described matrix material by the proportioning of mass percent is:
Polynary ferromagnetic filler 20%;
PTFE 80％；
Preferably, the granularity of described polynary ferromagnetic filler is 15-500 micron, preferred, and the granularity of described polynary ferromagnetic filler is 50-200 micron.
The preparation method of PTFE based composites of the present invention comprises the following steps:
S1, weighing: take each raw material by proportioning;
S2, batch mixing: each raw material is mixed, obtains compound;
S3, to cold pressing: described compound is put into compacting tool set, then compacting tool set is put into hydropress, under 55Mp, pressurize 15min is shaping, obtains part of colding pressing after release;
S4, sintering: described part of colding pressing is put into sintering oven, at N
2protection under, be warming up to 230 DEG C, insulation 20min, then is warming up to 320 DEG C, and insulation 30min, is finally warming up to 350 DEG C, after insulation 100min, is down to room temperature, and polynary filler component must be utilized to change the PTFE based composites of regulation and control friction magnetization characteristic.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention is by adding polynary ferromagnetic filler, matrix material can be magnetized by friction induction in friction process, this physical influence changes with the content of ferromagnetic filler polynary in matrix material, utilize this effect effectively can control the transfer of frictional interface abrasive dust simultaneously, promote the formation of frictional interface transfer film, thus show as the stable of the friction and wear behavior of PTFE matrix material and improvement, be a kind of new way of PTFE composite material high performance.
Matrix material tribological property of the present invention is excellent, friction self-excitation magnetization property can be utilized in friction process to regulate the transfer ability of abrasive dust, thus can forming property is stablized, reliability is higher transfer film at frictional interface, the part of rotating mechanism relative movement can be made, as gear, sliding surface bearing, rolling bearing retainer etc. and slip antifriction component, be applied to each fields such as machinery, electronics, aerospace.
Accompanying drawing explanation
Fig. 1 be iron cobalt compounded mix under different content ratio, the Δ B time history plot of gained matrix material;
Fig. 2 be iron cobalt compounded mix under different content ratio, the Δ B of gained matrix material and the relation of frictional coefficient;
Fig. 3 be iron cobalt compounded mix under different content ratio, the Δ B of gained matrix material and the relation of abrasion loss;
Fig. 4 be iron nickel compounded mix under different content ratio, the Δ B time history plot of gained matrix material;
Fig. 5 be iron nickel compounded mix under different content ratio, the Δ B of gained matrix material and the relation of frictional coefficient;
Fig. 6 be iron nickel compounded mix under different content ratio, the Δ B of gained matrix material and the relation of abrasion loss;
Fig. 7 be cobalt nickel compounded mix under different content ratio, the Δ B time history plot of gained matrix material;
Fig. 8 be cobalt nickel compounded mix under different content ratio, the Δ B of gained matrix material and the relation of frictional coefficient;
Fig. 9 be cobalt nickel compounded mix under different content ratio, the Δ B of gained matrix material and the relation of abrasion loss.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Should understand, embodiment is only for illustration of the present invention, instead of for limiting the present invention, any amendment, equivalent replacement etc. made on basis of the present invention is all in protection scope of the present invention.
Below by specific embodiment, the technical scheme of the PTFE based composites of polynary ferromagnetic filler friction magnetization regulation and control that utilizes of the present invention is elaborated.
Embodiment 1
The present embodiment utilizes each raw material of the PTFE based composites of polynary filler component change regulation and control friction magnetization characteristic as shown in table 1 by the proportioning of mass percent, wherein iron cobalt is the mixture of iron powder and cobalt powder, in iron cobalt, the mass ratio of iron powder and cobalt powder is 1:1, and iron cobalt filler particles degree is 160 microns.
Add the magnetic induction density HT108 type Hall type Tesla meter (sensitivity 0.01 ± 1%mT, the smooth and prosperous magnetoelectricity Science and Technology Ltd. in Shanghai produces) produced by friction induction in the matrix material of polynary ferromagnetic filler and mating plate 45 steel friction process to measure in real time; Moment of friction in experiment and load are measured and record in real time by sensor, and frictional coefficient is drawn by computed in software in conjunction with real-time moment of friction and load; The abrasion loss of each sample is characterized by the loss of FA2104B electronic balance measurement quality.Under different iron cobalt contents, the magnetic flux density measurement result produced in sample friction process is as shown in table 1, and as can be seen from the table along with the increase of iron cobalt filler content in sample, friction induction magnetic induction density increases.
Table 1
Embodiment 2
By the mass ratio of iron powder and cobalt powder in iron cobalt used for sample in embodiment 2 for change into respectively: 1:19,5:15,10:10,15:5,19:1, gained sample is tested by the mode that embodiment 1 is identical, the magnetic induction density that sample produces in friction process as shown in Figure 1, as can be seen from Figure 1 under the impact of iron cobalt compounded mix, friction induction magnetic induction density Δ B general trend increases along with the increase of cobalt contents proportion, and the fluctuating range of Δ B curve is larger in whole experimentation.Associate with frictional coefficient and abrasion loss the magnetic induction density produced in friction process, result as shown in Figures 2 and 3, can clearly be found out from Fig. 2, and the rubbing factor of PTFE based composites reduces along with the increase of friction induction magnetic induction density.This illustrates that the specific magnetising moment produced by friction induction can promote the reduction of matrix material self friction factor.As can be seen from Figure 3 PTFE based composites abrasion loss along with the increase of the friction induction specific magnetising moment on a declining curve, result shows that the increase of the PTFE based composites friction induction specific magnetising moment of iron content cobalt filler contributes to improving the wear resistance of matrix material.
Embodiment 3
Each raw material that the present embodiment utilizes polynary filler component to change the PTFE based composites of regulation and control friction magnetization characteristic by the proportioning of mass percent is: iron nickel 20wt%, tetrafluoroethylene 80wt%;
Wherein iron nickel is the mixture that iron powder and nickel powder are formed by different ratios (1:19,5:15,10:10,15:5,19:1).Gained sample is tested by the mode that embodiment 1 is identical, result as shown in Figure 4, can be known from figure, 1Fe19Ni and 5Fe15Ni, namely iron nickel content ratio is under 1:19 and 5:15 two kinds of operating modes, Fe-Ni/PTFE matrix material friction induction magnetic induction density Δ B over time fluctuation ratio is comparatively large, and under other operating mode, Δ B variation tendency is more steady.The magnetic induction density that sample produces in friction process is associated with frictional coefficient and abrasion loss, result as illustrated in Figures 5 and 6, the frictional coefficient that produces in friction process of sample and abrasion loss all decline along with the increase of friction magnetic induction density as we can see from the figure, coming to the same thing in this and embodiment 2.
Embodiment 4
Each raw material that the present embodiment utilizes polynary filler component to change the PTFE based composites of regulation and control friction magnetization characteristic by the proportioning of mass percent is: cobalt nickel 20wt%, tetrafluoroethylene 80wt%;
Wherein cobalt nickel is the mixture that cobalt powder and nickel powder are formed by different ratios (1:19,5:15,10:10,15:5,19:1).Gained is tested by the mode that embodiment 1 is identical, result as shown in Figure 7, as can be seen from the figure cobalt nickel compounded mix is under different content ratio, the time dependent curve of matrix material Δ B can be found out, under each different content of cobalt and nickel ratio, friction induction magnetic induction density Δ B fluctuates comparatively large over time, and friction induction magnetic induction density Δ B increases along with the increase of nickel powder content ratio.The magnetic induction density that sample produces in friction process is associated with frictional coefficient and abrasion loss, result as shown in FIG. 8 and 9, as can be seen from the figure the frictional coefficient of matrix material and abrasion loss all reduce along with the increase of the friction magnetic induction density produced in friction process, show that the increase of the matrix material friction induction specific magnetising moment contributes to improving the wear resistance of matrix material.
Matrix material of the present invention has good tribological property, and the relation between this friction self-excitation specific magnetising moment that can be formed from its friction process and friction and wear behavior is illustrated.Under different filler content and different working condition, tribological property test is carried out to the PTFE based composites of polynary ferromagnetic filler friction magnetization regulation and control, material can produce the different friction self-excitation specific magnetising moment in friction process, but the abrasion loss of matrix material and frictional coefficient reduce along with the enhancing of the friction self-excitation specific magnetising moment, thus for different operating modes, due to the magnetized effect of friction self-excitation, obviously can improve the tribological property of matrix material, result is as shown in Fig. 2,3,5,6,8,9; The rubbing factor that Fig. 2,5,8 is PTFE based composites reduces along with the increase of friction induction magnetic induction density.This illustrates that the specific magnetising moment produced by friction induction can promote the reduction of matrix material self friction factor, and this is similar to the frictional coefficient that externally-applied magnetic field reduces material, and more convenient.Fig. 3,6,9 be PTFE based composites abrasion loss along with the increase of the friction induction specific magnetising moment on a declining curve.Result of study shows the wear resistance contributing to improving matrix material containing the increase of the PTFE based composites friction induction specific magnetising moment of ferromagnetic filler.
Claims (4)
1. utilize polynary filler component to change the PTFE based composites of regulation and control friction magnetization characteristic, it is characterized in that: each raw material of described matrix material by the proportioning of mass percent is:
Polynary ferromagnetic filler 1-35%;
PTFE 65-99％；
Described polynary ferromagnetic filler is mixed in any proportion by least two kinds in iron, cobalt and nickel to form.
2. the PTFE based composites utilizing polynary filler component to change regulation and control friction magnetization characteristic according to claim 1, is characterized in that: each raw material of described matrix material by the proportioning of mass percent is:
Polynary ferromagnetic filler 1-25%;
PTFE 75-99％；
Described polynary ferromagnetic filler is mixed in any proportion by least two kinds in iron, cobalt and nickel to form.
3. the PTFE based composites utilizing polynary filler component to change regulation and control friction magnetization characteristic according to claim 1 and 2, is characterized in that: the granularity of described polynary ferromagnetic filler is 15-500 micron.
4. the PTFE based composites utilizing polynary filler component to change regulation and control friction magnetization characteristic according to claim 3, is characterized in that: the granularity of described polynary ferromagnetic filler is 50-200 micron.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103333442A (en) * | 2013-06-08 | 2013-10-02 | 山东瑞特新材料有限公司 | Preparation method of TiO2-SiC-fiber filled polytetrafluoroethylene composite material |
| CN103396667A (en) * | 2013-07-25 | 2013-11-20 | 哈尔滨工业大学 | Preparation and self-restoration method of carbon fiber/silver nanoparticle/polyether sulfone composite material with interface self-restoration function |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103333442A (en) * | 2013-06-08 | 2013-10-02 | 山东瑞特新材料有限公司 | Preparation method of TiO2-SiC-fiber filled polytetrafluoroethylene composite material |
| CN103396667A (en) * | 2013-07-25 | 2013-11-20 | 哈尔滨工业大学 | Preparation and self-restoration method of carbon fiber/silver nanoparticle/polyether sulfone composite material with interface self-restoration function |
Non-Patent Citations (1)
| Title |
|---|
| 杨婷婷: ""铁磁性颗粒复合添加PTFE复合材料摩擦过程的自激发磁化与摩擦学的关联性研究"", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
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