Ti5Si<3+>CaF2 reinforced in-situ self-generated multi-phase doped composite material and preparation method thereof
A composite material, in-situ self-generating technology, applied in the field of materials, can solve the problems of poor wear resistance and short service life of molds, and achieve the effects of low equipment cost, relatively low equipment cost and easy operation.
Inactive Publication Date: 2019-09-10
BEIJING JIAOTONG UNIV
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Problems solved by technology
At present, the problems of poor wear resistance and relatively short service life of molds have been plagued by extrusion processing manufacturers. Therefore, new high-temperature structural materials and material preparation methods with excellent high-temperature mechanical properties, high-temperature friction and wear properties, and high-temperature oxidation resistance are developed. It is of great significance to reduce production costs, improve production efficiency, improve the internal and appearance quality of products, and enhance the competitiveness of my country's light alloy profile extrusion processing enterprises in the international market.
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[0048] Select two optimally designed Ti in Table 1 5 Si 3 +CaF2 The reinforced in-situ self-generated multi-phase doped composite material is used as the test material of the example.
[0049] The Ti 5 Si 3 +CaF 2 Reinforced in-situ self-generated multi-phase doped composite material, its chemical composition is: Ti 22.2-25.89wt.%, Si 7.8-9.11wt.%, Inconel 718 50wt.%, Ni wrapped CaF 2 It is 15-20wt.%. The main constituent phase of the composite material is the primary metal silicide Ti 5 Si 3 Enhanced phase, CaF 2 Self-lubricating phase, matrix strengthening phase (NiTi 2 、Ti 5 Si 3 , γ"-Ni 3 Nb) and a supersaturated γ-(Ni, Fe) solid solution matrix in which a large amount of Ti and Cr elements are solid-dissolved.
[0050] The Ti 5 Si 3 +CaF 2 Reinforced in-situ self-generated multi-phase doped composite material, its chemical composition is: 25.89-29.6wt.% of Ti, 9.11-10.4wt.% of Si, 50wt.% of Inconel 718, Ni-packed CaF 2 It is 10-15wt.%. The main constituen...
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Abstract
The invention discloses a Ti5Si<3+>CaF2 reinforced in-situ self-generated multi-phase doped composite material and a preparation method thereof. The composite material comprises the following chemicalcomponents in percentage by weight: 22.2-29.6wt% of Ti, 7.8-10.4wt% of Si, 50wt% of Inconel 718, and 10-20wt% of Ni coated CaF2. The composite material takes primary Ti5Si3 as a reinforcing phase, takes CaF2 as a self-lubricating phase, and takes Ti5Si3 / NiTi2 / gamma'-Ni3Nb / gamma-(Ni, Fe) multi-element eutectic crystal as a matrix phase, and Ti5Si3 and NiTi2 are self-generated in situ. The composite material is compact in structure, is small in crystalline grain, and has excellent normal-temperature and high-temperature wear resistance, excellent friction reduction and excellent oxidization resistance. The Ti5Si<3+>CaF2 reinforced in-situ self-generated multi-phase doped composite material can be widely applied to manufacturing various key moulds which work under a bad service environment with high-temperature strong abrasion and high-temperature oxidization, and has a good application prospect.
Description
technical field [0001] The invention relates to the field of material technology, in particular to a Ti 5 Si 3 +CaF 2 Reinforced in-situ self-generated multiphase doped composite material and preparation method thereof. Background technique [0002] In the field of extrusion processing of light alloy profiles such as aluminum, magnesium, and titanium, my country is the largest country in terms of quantity, but it is not a powerful country. The key extrusion technology still lags behind the international advanced level, which is mainly reflected in the low extrusion speed and die life. Short of two main aspects. Taking the production of 6N01 high-speed rail aluminum alloy car body profiles of the same specification as an example, the extrusion speed of international enterprises is about 3-10m / min, while that of domestic enterprises is mostly 1-3m / min, and the average service life of domestic molds is only internationally advanced. About 1 / 3 of the level, the life of the mo...
Claims
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IPC IPC(8): C22C1/05C22C1/10C22C32/00B22F9/04B22F3/105
CPCB22F3/105B22F9/04B22F2009/041C22C1/05C22C32/0078
Inventor 刘元富石晨晓陆富刚刘志宏王昌坤金杰李荣华
Owner BEIJING JIAOTONG UNIV