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Calcium-magnesium-copper amorphous alloy with hot-pressing stability and preparation method thereof

An amorphous alloy, calcium and magnesium technology, applied in the field of amorphous alloy and its preparation, can solve the problems of difficult control of material composition, volatile raw materials, blank composition and process conditions, etc., and achieves a feasible method and good biocompatibility. , the effect of accurate ingredients

Active Publication Date: 2019-01-18
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Calcium-magnesium-based metallic glass has excellent glass-forming ability, but due to the high activity of calcium and magnesium elements, it is difficult to control the composition of the material formed by direct arc melting followed by copper mold casting, because the raw materials with low melting point are volatile , leading to its composition and process conditions suitable for hot press printing are still blank

Method used

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  • Calcium-magnesium-copper amorphous alloy with hot-pressing stability and preparation method thereof
  • Calcium-magnesium-copper amorphous alloy with hot-pressing stability and preparation method thereof
  • Calcium-magnesium-copper amorphous alloy with hot-pressing stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, calcium-magnesium-copper metallic glass was prepared by low-temperature reaction sintering and one-time copper mold casting, and its structure was characterized by X-ray diffractometer and transmission electron microscope:

[0022] 1) The alloy composition Ca:Mg:Cu weighs the raw material powder according to the atomic percentage of 8:5:7, and mixes it evenly for later use;

[0023] 2) Pour the mixed alloy powder evenly into a high-purity graphite crucible (20mm in diameter and 40mm in height), put it into the indenter, and preload it with 10Mpa for 10min;

[0024] 3) After the preload is complete, vacuum the system to 10 -5 Pa, and then pass high-purity argon (99.999%) to make the system vacuum up to half the atmospheric pressure, so repeat vacuuming and argon 3-5 times, and close the valve;

[0025] 4) After slowly increasing the pressure to 3.8Gpa, slowly increase (1°C / min) the temperature of the sintered crucible to 485°C and keep it warm for 24 h...

Embodiment 2

[0033] In this example, calcium-magnesium-copper metallic glass was prepared by low-temperature reaction sintering and one-time copper mold casting, and its structure was characterized by X-ray diffractometer and transmission electron microscope:

[0034] 1) The alloy composition Ca:Mg:Cu weighs the raw material powder according to the atomic percentage of 42:25:33, mixes it well and evenly for later use;

[0035] 2) Pour the mixed alloy powder evenly into a high-purity graphite crucible (20mm in diameter and 40mm in height), put it into the indenter, and preload it with 10Mpa for 10min;

[0036] 3) After the preload is complete, vacuum the system to 10 -5 Pa, and then pass high-purity argon (99.999%) to make the system vacuum up to half the atmospheric pressure, so repeat vacuuming and argon 3-5 times, and close the valve;

[0037] 4) After slowly increasing the pressure to 3.5Gpa, slowly increase (1°C / min) the temperature of the sintered crucible to 480°C and keep it warm ...

Embodiment 3

[0044] In this example, calcium-magnesium-copper metallic glass was prepared by low-temperature reaction sintering and one-time copper mold casting, and its structure was characterized by X-ray diffractometer and transmission electron microscope:

[0045] 1) The alloy composition Ca:Mg:Cu weighs the raw material powder according to the atomic percentage of 38:25:37, and mixes it evenly for later use;

[0046] 2) Pour the mixed alloy powder evenly into a high-purity graphite crucible (20mm in diameter and 40mm in height), put it into the indenter, and preload it with 10Mpa for 10min;

[0047] 3) After the preload is complete, vacuum the system to 10 -5 Pa, and then pass high-purity argon (99.999%) to make the system vacuum up to half the atmospheric pressure, so repeat vacuuming and argon 3-5 times, and close the valve;

[0048] 4) After slowly increasing the pressure to 4Gpa, slowly increase (1°C / min) the temperature of the sintered crucible to 490°C and keep it warm for 28h...

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Abstract

The invention discloses a calcium-magnesium-copper amorphous alloy and a preparation method thereof. The composition of the amorphous alloy is Ca(75-x)Mg25Cux, where x is an atomic percentage and satisfies x=32-38%; the steps Method: Pour the calcium, magnesium and copper powders, which are fully mixed and uniform in proportion, into a high-purity carbon crucible, first keep warm at 475~495°C, 3~4 Gpa for 24 hours, and then slowly raise the temperature to 595~605°C, 0.5~1 Keep the temperature at Gpa for 4 hours, finally unload the pressure, raise the temperature to 705~715°C, and keep the temperature for 30 minutes; Rapid cooling of the melt in a copper mold yields the amorphous alloy. In the preparation process described in the invention, the three elements of calcium, magnesium and copper can be sintered into blocks by reaction at low temperature and under the protection of inert gas, so the composition of the obtained master alloy is accurate, and at the same time, the amorphous alloy has good biological properties. Compatibility, and has high specific strength and specific modulus.

Description

technical field [0001] The invention belongs to the field of amorphous alloys, and relates to an amorphous alloy with structural stability near the glass transition temperature and under certain pressure deformation conditions and a preparation method thereof. Background technique [0002] In the temperature range beyond the cold liquid state, ordinary metallic glasses are prone to crystallization due to their limited hot-pressing stability, thereby halting the processing. The traditional metallic glass (palladium-based) with super glass-forming ability is a potential material suitable for hot-press printing, but the variety is limited and the manufacturing cost is high. Therefore, discovering the secret of the super-strong glass-forming ability of traditional bulk metallic glasses and developing a low-cost amorphous alloy material suitable for hot-press printing are key core issues that need to be solved urgently in the current field. Calcium-magnesium-based metallic glass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00B22D18/06
CPCC22C45/001B22D18/06C22C1/11
Inventor 兰司王循理
Owner NANJING UNIV OF SCI & TECH