A kind of hot-cracking-resistant casting material based on magnesium-calcium-based alloy and its preparation method

A heat-cracking-resistant, base alloy technology, applied in the field of light alloy processing, can solve the problems of severe hot-cracking sensitivity and limited application range of magnesium-calcium alloys, and achieve good application prospects, strong operability, and good thermal-cracking resistance Effect

Active Publication Date: 2021-12-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a hot-cracking-resistant casting material based on magnesium-calcium-based alloys and a preparation method thereof, so as to solve the problem of severe hot-cracking problems in existing magnesium-calcium alloys with a Ca content of 0.5-1%. Sensitivity, issues that limit its scope of application

Method used

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  • A kind of hot-cracking-resistant casting material based on magnesium-calcium-based alloy and its preparation method
  • A kind of hot-cracking-resistant casting material based on magnesium-calcium-based alloy and its preparation method
  • A kind of hot-cracking-resistant casting material based on magnesium-calcium-based alloy and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Mechanically grind pure magnesium ingot, Mg-30%Ca master alloy and Mg-25%Sr master alloy, according to Ca: 1%, Sr: 0.4%, and the balance is the mass percentage of magnesium and unavoidable impurities Calculate ingredients.

[0023] 2) in CO 2 +0.2%SF 6 (volume fraction) Put pure Mg into the crucible under the protection of the mixed gas and heat it in the resistance furnace. When the temperature of the molten metal reaches 720°C, add the Mg-30%Ca master alloy into the pure magnesium in the molten state After the alloy is completely melted, lower the temperature to 680°C and then add the Mg-25%Sr intermediate alloy. The temperature is lowered to 680°C to reduce the burning loss of Sr element, and then stir at a rate of 80r / min for 1 min. slag, standing still; after 20 minutes of heat preservation, pour it into a CRC hot-cracking mold preheated to 350°C to obtain the hot-cracking-resistant casting material.

Embodiment 2

[0025] 1) Using pure magnesium ingot, Mg-30%Ca master alloy and Mg-25%Sr master alloy as raw materials, perform mechanical grinding, according to Ca: 1%, Sr: 0.5%, and the balance is the mass of magnesium and unavoidable impurities The percentage content is used to calculate the ingredients.

[0026] 2) in CO 2 +0.2%SF 6 (volume fraction) Put pure Mg into the crucible under the protection of the mixed gas and heat it in the resistance furnace. When the temperature of the molten metal reaches 720°C, add the Mg-30%Ca master alloy into the pure magnesium in the molten state After the alloy is completely melted, lower the temperature to 680°C and then add the Mg-25%Sr intermediate alloy. The temperature is lowered to 680°C to reduce the burning loss of Sr element, and then stir at a rate of 80r / min for 1 min. slag, standing still; after 20 minutes of heat preservation, pour it into a CRC hot-cracking mold heated to 350°C to obtain the hot-cracking-resistant casting material.

Embodiment 3

[0028] 1) Using pure magnesium ingots, Mg-30%Ca master alloy and Mg-25%Sr master alloy as raw materials, carry out mechanical grinding, according to Ca: 1%, Sr: 0.6%, and the balance is the mass of magnesium and unavoidable impurities The percentage content is used to calculate the ingredients.

[0029] 2) in CO 2 +0.2%SF 6 (volume fraction) Put pure Mg into the crucible under the protection of the mixed gas and heat it in the resistance furnace. When the temperature of the molten metal reaches 720°C, add the Mg-30%Ca master alloy into the pure magnesium in the molten state After the alloy is completely melted, lower the temperature to 680°C and then add the Mg-25%Sr intermediate alloy. The temperature is lowered to 680°C to reduce the burning loss of Sr element, and then stir at a rate of 80r / min for 1 min. slag, standing still; after 20 minutes of heat preservation, pour it into a CRC hot-cracking mold heated to 350°C to obtain the hot-cracking-resistant casting material. ...

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Abstract

The invention discloses a hot-cracking-resistant casting material based on a magnesium-calcium-based alloy and a preparation method thereof. The hot-cracking-resistant casting material is composed of the following components in mass fractions: Ca 0.5-1%, Sr 0.4-1%, The balance is magnesium and unavoidable impurities. The present invention reduces the fragile temperature range of the magnesium-calcium alloy by precisely controlling the addition amount of Sr element, increases the content of the eutectic phase, and thus has more liquid phases for feeding at the end of solidification, reducing the hot cracking sensitivity of the alloy . The magnesium alloy prepared by the invention has thermal cracking resistance sensitivity, excellent mechanical properties, good machinability, fluidity and die-casting properties, and can meet the performance requirements of the development of alloy castings towards the direction of lightness, thinness and complex shapes. In addition, the raw material is simple and easy to obtain, without rare earth elements, greatly reduces the cost, and has good application prospects and economic benefits.

Description

technical field [0001] The invention relates to a preparation method of a deformed alloy, in particular to a magnesium-calcium-based alloy-based thermal crack-resistant casting material and a preparation method thereof, belonging to the technical field of light alloy processing. Background technique [0002] Due to its low density, high specific strength, good thermal conductivity, good damping performance, good electromagnetic shielding performance and other advantages, magnesium alloy is called "green engineering material in the 21st century". It has very broad prospects in the fields of aviation industry, automobiles, motorcycles, optical instruments, mechanical equipment and electronic products. However, studies have found that commercial magnesium alloys have insufficient high-temperature strength and poor high-temperature creep resistance, and can only be used below 150°C, which greatly limits their applications. [0003] The study found that the addition of calcium c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03
CPCC22C23/00C22C1/03
Inventor 宋江凤赵华蒋斌潘复生杨芷沅佘加庞栋张金生郝晓伟
Owner CHONGQING UNIV
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