A kind of nial alloy doped with b and its preparation method and application
An alloy and alloy block technology, applied in the field of NiAl alloy and its preparation, achieves the effect of less machining process, excellent room temperature plasticity and small grain size
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Embodiment 1
[0035] The NiAl alloy of the present embodiment comprises according to molar percentage composition:
[0036] Al: 50%;
[0037] B: 0.05%;
[0038] The balance is Ni.
[0039] The preparation method of this embodiment is prepared by vacuum induction melting, with Ni block, Al block and B powder as raw materials, Ni block is placed on the bottom of the crucible, B powder is placed on the Ni block, and Al block is placed on the top of the crucible , and vacuum induction melting was carried out at a melting temperature of 1700° C., that is, the B-containing NiAl alloy of this embodiment was obtained.
[0040] See Table 1, Table 1 is the comparison of oxidation weight gain between the alloy of the embodiment of the present invention and Ni-50Al at 800°C, 1000°C, and 1200°C.
[0041] It can be seen from Table 1 that in the high-temperature oxidation tests at 800°C, 1000°C, and 1200°C, the alloy of this example has a strong bond between the oxide film and the substrate without pee...
Embodiment 2
[0049] This embodiment provides a NiAl alloy containing B, and the composition includes:
[0050] Al: 50%;
[0051] B: 0.05%;
[0052] The balance is Ni.
[0053] The preparation method of this example: using Ni powder, Al powder and B powder as raw materials, it is prepared by vacuum hot pressing method. The process of using vacuum hot pressing is as follows: pressing pressure is 15MPa; 200°C for 2h; 500°C for 1h; 600°C ℃ for 3 hours, 800 ℃ for 1 hour, 1250 ℃ for 2 hours and then cooled in the furnace to obtain the B-containing NiAl alloy of this example.
[0054] See Table 3, Table 3 is the comparison of oxidation weight gain between the alloy in this example and Ni-50Al at 800°C, 1000°C, and 1200°C.
[0055] It can be seen from Table 3 that in the high-temperature oxidation tests at 800°C, 1000°C, and 1200°C, the alloy of this example has a strong bond between the oxide film and the substrate without peeling off, and the thickness of the oxide film is lower than that of ...
Embodiment 3
[0063] An application of the NiAl alloy of the present invention in the preparation of a glass hot-bending mold. The NiAl glass hot-bending mold is composed of two molds: a concave mold and a convex mold. The product is prepared by smelting, and precision casting molds are required, such as figure 1 and figure 2 as shown, figure 1 is a schematic diagram of the hot bending mold used to prepare the convex NiAl glass, figure 2 It is a schematic diagram for preparing a concave NiAl glass hot bending mold. The investment casting mold is made of graphite or steel, and is divided into two parts by the parting surface.
[0064] The present embodiment adopts smelting method to prepare mold, specific method:
[0065] (1) Ni block, Al block, B powder are carried out reaction smelting, prepare master alloy;
[0066] (2) vacuum induction melting the master alloy obtained in step (1);
[0067] (3) pouring the alloy melt that step (2) obtains, adopts such as figure 1 or figure 2 ...
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