CN111270111A

CN111270111A - Aluminum-silicon alloy containing Ti and B and preparation method thereof

Info

Publication number: CN111270111A
Application number: CN202010252082.4A
Authority: CN
Inventors: 李小松; 刘童; 万辉; 蔡安辉; 李天亦
Original assignee: Hunan Institute of Science and Technology
Current assignee: Hunan Institute of Science and Technology
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-06-12

Abstract

The invention provides an aluminum-silicon alloy containing Ti and B, belonging to the technical field of alloy materials. The aluminum-silicon alloy containing Ti and B provided by the invention comprises the chemical components of 12.9 wt% of Si, 0.003-0.015 wt% of B, 0.015-0.075 wt% of Ti and the balance of Al. The Al-Si alloy containing Ti and B has a thermal expansion coefficient of 3.05X 10 at 300 deg.C measured by thermal expansion instrument^‑5/℃‑3.57×10^‑5/° c, latent heat of phase change was measured with a thermal analyzer (DSC) of 423.2J/g-550.2J/g.

Description

Aluminum-silicon alloy containing Ti and B and preparation method thereof

Technical Field

The invention belongs to the technical field of alloy materials, and particularly relates to an aluminum-silicon alloy containing Ti and B and a preparation method thereof.

Background

The aluminum-silicon alloy has the characteristics of large heat conductivity coefficient, high energy storage density, high and stable working temperature and the like, and can reduce the size and the quality of a heat energy storage unit, and allow large isothermal operation, and the aluminum-silicon alloy becomes the most important metal phase change heat storage material at present, and has good application prospects in high-temperature heat storage such as solar thermal power generation, industrial waste heat recovery, power peak load shifting and the like.

Disclosure of Invention

One of the objects of the present invention is to provide an aluminum-silicon alloy containing Ti and B.

In order to achieve the purpose, the invention adopts the following technical scheme:

the aluminum-silicon alloy containing Ti and B comprises the chemical components of, by mass, 12.9% of Si, 0.003-0.015% of B, 0.015-0.075% of Ti and the balance of Al.

Preferably, the latent heat of phase change of the aluminum-silicon alloy containing Ti and B is 423.2J/g-550.2J/g; an Al-Si alloy containing Ti and B has a thermal expansion coefficient of 3.05X 10 at 300 deg.C^-5/℃-3.57×10^-5/℃。

The invention also provides a preparation method of the aluminum-silicon alloy containing Ti and B, which comprises the following steps: step one, preheating a well type resistance furnace to 100 ℃, putting industrial pure aluminum (with the purity of 99.9 Wt%) and crystalline silicon (with the purity of 99.9 Wt%) into a graphite crucible, heating to 800 ℃ at the heating rate of 10 ℃/min, stirring for 5 minutes after complete melting, and keeping the temperature for 60 minutes;

step two, cooling to 760 ℃ at the speed of 2 ℃/min, adding 0.5 Wt% of hexachloroethane by adopting a pressing method to refine and degas the aluminum-silicon alloy liquid, stirring, slagging off, and keeping the temperature for 30 minutes; step three, cooling to 730 ℃ at the speed of 2 ℃/min, adding Al-5Ti-B intermediate alloy, stirring for 5 minutes, and preserving heat for 50 minutes to carry out refining treatment;

and step four, stirring again, slagging off, and pouring the alloy liquid into a metal casting mold with the temperature of 100 ℃.

The product prepared by the invention respectively uses an X-ray diffractometer (XRD) to detect the types of phases, uses a metallographic microscope (OEM) to observe the appearance, the size and the distribution of the structure, uses a thermal expansion instrument to measure the thermal expansion coefficient, and uses a thermal analyzer (DSC) to measure the latent heat of phase change.

The Al-Si alloy containing Ti and B provided by the invention has the chemical components of 12.9 wt% of Si, 0.003-0.015 wt% of B, 0.015-0.075 wt% of Ti and the balance of Al, the latent heat of phase change of the Al-Si alloy is 423.2J/g-550.2J/g, and the coefficient of thermal expansion of the Al-Si alloy at 300 ℃ is 3.05 multiplied by 10^-5/℃-3.57×10^-5/℃。

Detailed Description

The technical solution of the present invention is further illustrated below according to specific embodiments:

example 1

Using balance to weigh 1720.4g of industrial pure aluminum, 259g of crystalline silicon and 29.7g of Al-5Ti-B intermediate alloy, preheating a well type resistance furnace to 100 ℃, and then adding the industrial pure aluminum (with purity of 100℃)>99.9 Wt%) and crystalline silicon (purity)>99.9 Wt%) in a graphite crucible, heating to 800 ℃ at a heating rate of 10 ℃/min, stirring for 5 minutes after complete melting, and keeping the temperature for 60 minutes; cooling to 760 ℃ at the speed of 2 ℃/min, adding 0.5 Wt% of hexachloroethane by adopting a pressing method to refine and degas the aluminum-silicon alloy liquid, stirring, slagging off, and keeping the temperature for 30 minutes; cooling to 730 ℃ at the speed of 2 ℃/min, adding Al-5Ti-B intermediate alloy, stirring for 5 minutes, and keeping the temperature for 50 minutes for refining; then stirring, slagging off and pouring the alloy liquid into a metal casting mold with the temperature of 100 ℃. Its latent heat of phase change is 423.2J/g, and its thermal expansion coefficient at 300 deg.C is 3.57X 10^-5/℃。

Example 2

Using balance to weigh 1704.4g of industrial pure aluminum, 253.3g of crystalline silicon and 5.9g of Al-5Ti-B intermediate alloy, preheating a well type resistance furnace to 100 ℃, and then adding the industrial pure aluminum (with purity)>99.9 Wt%) and crystalline silicon (purity)>99.9 Wt%) in a graphite crucible, heating to 800 ℃ at a heating rate of 10 ℃/min, stirring for 5 minutes after complete melting, and keeping the temperature for 60 minutes; cooling to 760 deg.C at a rate of 2 deg.C/min, adding 0.5 Wt% hexachloroethane by pressing, refining, degassing, stirring, removing slag, and maintaining the temperature30 minutes; cooling to 730 ℃ at the speed of 2 ℃/min, adding Al-5Ti-B intermediate alloy, stirring for 5 minutes, and keeping the temperature for 50 minutes for refining; then stirring, slagging off and pouring the alloy liquid into a metal casting mold with the temperature of 100 ℃. Its latent heat of phase change is 499.1J/g, and its thermal expansion coefficient at 300 deg.C is 3.12X 10^-5/℃。

Example 3

Using balance to weigh 1716.6g of industrial pure aluminum, 256g of crystalline silicon and 11.8g of Al-5Ti-B intermediate alloy, preheating a well type resistance furnace to 100 ℃, and then adding the industrial pure aluminum (with purity of 100℃)>99.9 Wt%) and crystalline silicon (purity)>99.9 Wt%) in a graphite crucible, heating to 800 ℃ at a heating rate of 10 ℃/min, stirring for 5 minutes after complete melting, and keeping the temperature for 60 minutes; cooling to 760 ℃ at the speed of 2 ℃/min, adding 0.5 Wt% of hexachloroethane by adopting a pressing method to refine and degas the aluminum-silicon alloy liquid, stirring, slagging off, and keeping the temperature for 30 minutes; cooling to 730 ℃ at the speed of 2 ℃/min, adding Al-5Ti-B intermediate alloy, stirring for 5 minutes, and keeping the temperature for 50 minutes for refining; then stirring, slagging off and pouring the alloy liquid into a metal casting mold with the temperature of 100 ℃. Its latent heat of phase change is 550.2J/g, and its thermal expansion coefficient at 300 deg.C is 3.05X 10^-5/℃。

Table 1 shows the latent heat of transformation and the coefficient of thermal expansion at 300 ℃ of Al-5Ti-B master alloys added in various contents in examples 1-3.

Claims

1. An aluminum-silicon alloy containing Ti and B, characterized in that: the aluminum-silicon alloy containing Ti and B comprises the following chemical components of 12.9 wt% of Si, 0.003-0.015 wt% of B, 0.015-0.075 wt% of Ti and the balance of Al.

2. The Al-Si alloy containing Ti and B according to claim 1, wherein the Al-Si alloy contains Si in the range of about one hundred fifty percent (L) to about one hundred (L) and Y in the range of about one hundred (L) to about one hundred (L): the latent heat of phase change of the aluminum-silicon alloy containing Ti and B is 423.2J/g-550.2J/g; an Al-Si alloy containing Ti and B has a thermal expansion coefficient of 3.05X 10 at 300 deg.C^-5/℃-3.57×10^-5/℃。

3. The method of claim 1, wherein the process comprises the steps of:

step one, preheating a well type resistance furnace to 100 ℃, putting industrial pure aluminum (with the purity of 99.9 Wt%) and crystalline silicon (with the purity of 99.9 Wt%) into a graphite crucible, heating to 800 ℃ at the heating rate of 10 ℃/min, stirring for 5 minutes after complete melting, and keeping the temperature for 60 minutes;

step two, cooling to 760 ℃ at the speed of 2 ℃/min, adding 0.5 Wt% of hexachloroethane by adopting a pressing method to refine and degas the aluminum-silicon alloy liquid, stirring, slagging off, and keeping the temperature for 30 minutes;

step three, cooling to 730 ℃ at the speed of 2 ℃/min, adding Al-5Ti-B intermediate alloy, stirring for 5 minutes, and preserving heat for 50 minutes to carry out refining treatment;