A kind of germanium-containing nickel-free phosphorus-free large-size palladium-based amorphous alloy and preparation method thereof
An amorphous alloy, large-scale technology, applied in the field of large-scale palladium-based amorphous alloy containing germanium, nickel-free, phosphorus-free and its preparation
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[0063] Another object of the present invention is to provide the preparation method of above-mentioned alloy, and this method specifically comprises the following steps:
[0064] Preparation method (1): Preparation of master alloy without glass coating and purification, and preparation of amorphous alloy by copper mold suction casting, the steps include:
[0065] Step 1. Ingredients: convert metal Pd, Cu, Ag and non-metallic Si and Ge with a purity of 99.0wt%-99.99wt% into mass according to the atomic percentage of the above expression, remove the oxide skin on the surface of the raw material, and use industrial ethanol Clean the raw materials and weigh them according to their required quality;
[0066] Step 2. Master alloy smelting: stack the raw materials treated in step 1 in the order of melting point in a non-consumable vacuum electric arc furnace or cold crucible suspension furnace, and place them in a vacuum below 10 -3 After Pa is filled with high-purity argon (not les...
Embodiment 1
[0078] Embodiment 1: Preparation of Pd-Cu-Si-Ge series amorphous alloy:
[0079] Design Pd a Cu b Ge c Si d Ag e Amorphous alloy composition, where a=77.5, b=6, c=16.5, 8.5, 4, 8, 12.5, d=0, e=0. Get the composition as Pd 77.5 Cu 6 Ge 16.5 , Pd 77.5 Cu 6 Si 8 Ge 8.5 , Pd 77.5 Cu 6 Si 12.5 Ge 4 alloy.
[0080] Figure 1 shows the alloy Pd 77.5 Cu 6 Ge 16.5 , Pd 77.5 Cu 6 Si 8 Ge 8.5 The XRD pattern of the 2mm sample prepared by the preparation method (3), figure 2 Alloy Pd 77.5 Cu 6 Si 12.5 Ge 4 The XRD patterns of the 2mm and 4mm samples prepared by the preparation method (2) have only the typical diffuse scattering peaks of amorphous, indicating that the prepared alloys are all in the amorphous phase, and the alloy system can be prepared by the preparation method (3). Amorphous alloys with dimensions not less than 2 mm, Pd 77.5 Cu 6 Si 12.5 Ge 4 Through the preparation method (2), the alloy can prepare an amorphous alloy with a critical size no...
Embodiment 2
[0082] Embodiment 2: the preparation of Pd-Cu-Si-Ge-Ag series amorphous alloy:
[0083] Design Pd a Cu b Ge c Si d Ag e Amorphous alloy composition, where a=77.5, b=5,4,3, c=4, d=12.5, e=1,2,3. Get the composition as Pd 77.5 Cu 5 Si 12.5 Ge 4 Ag 1 , Pd 77.5 Cu 4 Si 12.5 Ge 4 Ag 2 , Pd 77.5Cu 3 Si 12.5 Ge 4 Ag 3 alloy.
[0084] Figure 5 Alloy Pd 77.5 Cu 5 Si 12.5 Ge 4 Ag 1 , Pd 77.5 Cu 4 Si 12.5 Ge 4 Ag 2 The XRD pattern of the 8mm sample prepared by the preparation method (3), Figure 6 for with Figure 5 The corresponding SEM photos, Figure 7 Alloy Pd 77.5 Cu 3 Si 12.5 Ge 4 Ag 3 The XRD pattern of the 8mm sample prepared by the preparation method (3), and the 4mm sample prepared by the preparation method (1), Figure 8 for with Figure 7 Corresponding to the SEM photo, the XRD pattern has only the typical diffuse scattering peak of the amorphous, and the corresponding SEM photo also shows a single amorphous phase composition of the al...
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