High strength low melting-temperature alloy and manufacturing method thereof

A low melting point metal, low melting point technology, applied in the field of alloy material preparation, can solve the problems of low strength, low precision, inconvenient operation, etc., and achieve the effect of improving strength and hardness, improving strength, and reliable application range

Inactive Publication Date: 2012-08-29
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the hardness is low, the strength is not high, and its sample production is difficult
As far as the present is concerned, the production of prototypes mainly depends on manual knocking, which is inconvenient to operate, labor-intensive, and the precision is not high, and it is easy to deform when casting the mold

Method used

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  • High strength low melting-temperature alloy and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Pb-based alloy. Using the in-situ reaction method, add 40% by weight of Ba, Ca, Li, Mg or rare earth elements Dy, La, Y, Gd and other metals and 10% of Al in the induction furnace, heat to 650 ° C, and wait for it After melting, 50% by weight of low melting point metal Pb was added. Stir for 1min to 2min to make Mg and Pb fully react to form intermetallic compounds, stand still for 2min, and cast by bottom casting at a casting temperature of 440°C to prepare a Pb-based alloy material with ultra-high strength and low melting point. And make test samples for testing and analysis of mechanical properties and microstructure. The test results are as follows:

[0014] ①Tensile strength test: Prepare a test sample rod and carry out tensile strength test on a tensile mechanical testing machine. The test results show that the tensile strength of the ultra-high-strength low-melting point Pb-based alloy reaches 228MPa, which is the standard of traditional Babbitt allo...

Embodiment 2

[0017] Embodiment 2: Sn-based alloy. Using the in-situ reaction method, add 30% by weight of Ba, Ca, Li, Mg or rare earth elements Dy, La, Y, Gd and other metals and 8% of Al in the total weight into the induction furnace, heat to 650 ° C, and wait for it After melting, 62% by weight of low-melting metal Sn was added. Stir for 1min to 2min to make Mg and Sn fully react to form intermetallic compounds, stand still for 2min, and cast by bottom casting at a casting temperature of 550°C to prepare an ultra-high-strength, low-melting-point Sn-based alloy material. And make test samples for testing and analysis of mechanical properties and microstructure. The test results are as follows:

[0018] ①Tensile strength test: Prepare a test sample bar for tensile strength test on a tensile mechanical testing machine. The test results show that the tensile strength of the ultra-high-strength low-melting-point Sn-based alloy reaches 180MPa, which is the standard of traditional Babbitt all...

Embodiment 3

[0020] Embodiment 3: Bi-based alloy. Using the in-situ reaction method, add 30% by weight of Ba, Ca, Li, Mg or rare earth elements Dy, La, Y, Gd and other metals and 5% of Al in the total weight into the induction furnace, heat to 650 ° C, and wait for the After melting, 65% by weight of low-melting metal Bi was added. Stir for 1min to 2min to make Mg and Bi fully react to form intermetallic compounds, stand for 2min, and cast by bottom casting at a casting temperature of 600°C to prepare an ultra-high-strength, low-melting-point Bi-based alloy material. And make test samples for testing and analysis of mechanical properties and microstructure. The test results are as follows:

[0021] ①Tensile strength test: The test sample bar was prepared and tested for tensile strength on a tensile mechanical testing machine. The test results showed that the tensile strength of the ultra-high-strength low-melting point Bi-based alloy reached 200MPa.

[0022] ②Brinell hardness test: The ...

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Abstract

The invention pertaining to the a composite material for manufacturing babbitt metal axle bush and low-melting alloy dies and the preparation technique thereof, provides a high-strength low melting-temperature alloy and a method for producing the same. The method comprises steps of firstly melting the second group component metal with a higher point of fusion, then adding low-melting point metal,stirring for reaction in-situ, therefore, the low-melting point metal and the second group component metal generating the intermetallic compound combined by hybrid bonds of metallic bond and covalentbond. The mechanical properties (tensile strength and rigidity ) of the alloy material manufactured by using the technology of the invention are greatly improved, and the alloy possesses a characteristic of ultrahigh strength in real meanings.

Description

technical field [0001] The invention belongs to a preparation method of an alloy material used for a bearing bush and a low melting point alloy mold, in particular to a preparation method of a bearing bush material with high strength and hardness and good wear resistance. Background technique [0002] Babbitt alloy is a traditional bearing material for low speed and high (heavy) load. Its advantages are small friction coefficient, good wear reduction, excellent plasticity, toughness and corrosion resistance. However, the strength and hardness of babbitt alloy are lower, and the service life is shorter. During use, if the lubrication is poor, the temperature rise will further reduce its yield strength and hardness; when the temperature is around 100°C, its yield strength and hardness are almost only half of those at normal temperature. A big downside of alloys. [0003] The low-melting point alloy has good fluidity after heating and melting, and can be shaped arbitrarily a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02
Inventor 孙勇段永华竺培显
Owner KUNMING UNIV OF SCI & TECH
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