Novel application of porous iron-based shape memory alloy in field of friction materials
A technology of memory alloy and friction material, which is applied to porous iron-based shape memory alloy in the field of friction material and friction material, to achieve the effects of slowing down the temperature rise, simple preparation method and increasing surface area
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Embodiment 1
[0027] The pure Fe, Mn, Si powders are mechanically alloyed under the protection of argon, the ball-to-material ratio is 27:2, the rotating speed is 400r / min, and the time is 20h; a certain proportion of 3% PVA aqueous solution is dropped into the alloy powder as Binder, grinding, cold pressing, and sintering at 1000°C, 1100°C, and 1200°C respectively, and the holding time is 7h. The micropores will be observed after being corroded by the grain boundary corrosion solution: the sintering at 1000°C is not complete, and the shape of the pores obtained by sintering at 1100°C is irregular ( figure 1 ), sintered at 1200°C to obtain nearly circular micropores with smooth edges ( figure 2 ). The metallographic structure was observed after corroded by tissue corrosion solution: no martensite was observed in the sintered structure at 1000 °C, a small amount of martensite was observed in the sintered structure at 1100 °C, and a small amount of martensite was observed in the sintered st...
Embodiment 2
[0029] The pure Fe, Mn, Si powders are mechanically alloyed under the protection of argon, the ball-to-material ratio is 27:2, the rotating speed is 400r / min, and the time is 50h; a certain proportion of 3% PVA aqueous solution is dropped into the alloy powder as Binder, grinding, cold pressing, sintering at 1100°C, holding time 7h. The laws of the metallographic structure of the sintered state and the solid solution treated state are similar to those of Example 1. After solution treatment and compression deformation, measure its DSC curve ( Figure 7 ), the reverse transformation point As of martensite is 85°C, which is much lower than the reverse transformation point of the alloy obtained by casting 140°C.
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