Supercooled IN718 high-temperature alloy purifying agent and preparation method for same

A technology of IN718 and superalloy, which is applied in the field of purifying agent and its preparation, can solve the problems such as the inability to carry out research on the microstructure evolution of IN718 superalloy, the difficulty of obtaining a large degree of supercooling, and the inability to meet the requirements of deep supercooling and rapid directional solidification. Granular refinement effect, low price, and the effect of less harmful gas

Inactive Publication Date: 2012-07-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the existing composite molten salt purifier, such as the literature "Purification Influencing Factors and Approaches of Supercooled DD3 Single Crystal Superalloy" (Liu Feng, Cai Yu, etc., Casting, 2000, 49 (6)) and "DZ125 Alloy Purification Preparation of agent and principle of deep supercooling” (Xie Faqin, Zhou Jun, etc., Thermal Proc

Method used

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  • Supercooled IN718 high-temperature alloy purifying agent and preparation method for same
  • Supercooled IN718 high-temperature alloy purifying agent and preparation method for same
  • Supercooled IN718 high-temperature alloy purifying agent and preparation method for same

Examples

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Example Embodiment

[0027] Example 1

[0028] Composite molten salt purifier composition (percentage): 50% calcium fluoride (CaF 2 ), 9% sodium chloride (NaCl), 9% potassium chloride (KCl), 22% calcium oxide (CaO), 4.5% titanium oxide (TiO 2 ), 4.5% magnesium oxide (MgO), 0.5% aluminum fluoride (AlF 3 ), the rare earth compound is LaCl 3 , The amount of rare earth added is 0.5%.

[0029] The production method of the high-temperature alloy purifying agent is as follows: according to the above ratio, the weighed calcium fluoride, sodium chloride, potassium chloride, calcium oxide, magnesium oxide, aluminum fluoride and titanium oxide are fully stirred in a mortar, Then add the mixed powder into the corundum crucible, put the crucible into the heat treatment furnace and heat it. After the temperature of the furnace rises to 800°C, keep it warm for 8 hours. , crush it and put it into a ball mill to grind it into powder. After sieving, add a rare earth compound and mix it with a ball mill. The pre...

Example Embodiment

[0031] Example 2

[0032] Composite molten salt purifier composition (percentage): 55% calcium fluoride (CaF 2 ), 8% sodium chloride (NaCl), 8% potassium chloride (KCl), 18% calcium oxide (CaO), 5.5% titanium oxide (TiO 2 ), 4% magnesium oxide (MgO), 0.75% aluminum fluoride (AlF 3 ), the rare earth compound is LaCl 3 , The amount of rare earth added is 0.75%.

[0033] The production method of the high-temperature alloy purifying agent is as follows: according to the above ratio, the weighed calcium fluoride, sodium chloride, potassium chloride, calcium oxide, magnesium oxide, aluminum fluoride and titanium oxide are fully stirred in a mortar, Then add the mixed powder into the corundum crucible, put the crucible into the heat treatment furnace and heat it. After the temperature of the furnace rises to 800°C, keep it warm for 8 hours. , crush it and put it into a ball mill to grind it into powder. After sieving, add a rare earth compound and mix it with a ball mill. The pre...

Example Embodiment

[0035] Example 3

[0036] Composite molten salt purifier composition (percentage): 45% calcium fluoride (CaF 2 ), 12% sodium chloride (NaCl), 12% potassium chloride (KCl), 19% calcium oxide (CaO), 4% titanium oxide (TiO 2 ), 6% magnesium oxide (MgO), 1% aluminum fluoride (AlF 3 ), the rare earth compound is LaCl 3 , The amount of rare earth added is 1%.

[0037] The production method of the high-temperature alloy purifying agent is as follows: according to the above ratio, the weighed calcium fluoride, sodium chloride, potassium chloride, calcium oxide, magnesium oxide, aluminum fluoride and titanium oxide are fully stirred in a mortar, Then add the mixed powder into the corundum crucible, put the crucible into the heat treatment furnace and heat it. After the temperature of the furnace rises to 800°C, keep it warm for 8 hours. , crush it and put it into a ball mill to grind it into powder. After sieving, add a rare earth compound and mix it with a ball mill. The prepared ...

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Abstract

The invention discloses a supercooled IN718 high-temperature alloy purifying agent and a preparation method for the same. The preparation method includes: sufficiently mixing 45-55 parts of CaF2 (calcium fluoride), 8-12 parts of NaCl (sodium chloride), 8-12 parts of KCl (potassium chloride), 18-22 parts of CaO (calcium oxide), 4-6 parts of TiO2 (titanium dioxide), 4-6 parts of MgO (magnesium oxide) and 0.5-1.0 part of AlF3 (aluminum fluoride) to obtain mixed powder; heating the mixed powder to 800 DEG C and then preserving heat for 8 hours; naturally cooling the mixed powder to room temperature after heat preservation; and milling the mixture into powder after crushing the mixture, and adding 0.5-1.0 part of rare earth compound LaCl3 (lanthanum chloride) to obtain the purifying agent. The purifying agent can integrate the functions of overwrite protection, oxidation and volatilization prevention and impurity removal, components of the purifying agent are easy to obtain, the purifying agent is convenient to add, the operating process is simple, and the cost is low.

Description

technical field [0001] The invention relates to a purifier and a preparation method thereof, which is specially used for the supercooling and purification research of IN718 nickel-based superalloy, and belongs to the technical field of metal materials and metallurgy. Background technique [0002] As an advanced material preparation and processing technology, deep subcooling and rapid solidification can reduce the degree of structure segregation, homogenize the composition, and significantly refine the grains. Finding an effective purging agent to remove the heterogeneous core in the melt or inhibit the heterogeneous nucleation of the heterogeneous core to obtain a large degree of supercooling is the key to the study of deep supercooling. [0003] In recent years, the research on deep supercooled rapid solidification of large volume liquid metals has been very active, and great progress has been made, but there are still the following problems: [0004] (1) The research on d...

Claims

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Application Information

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IPC IPC(8): B22D27/20C22C1/06C22C19/03
Inventor 谢发勤彭子超张军吴向清
Owner NORTHWESTERN POLYTECHNICAL UNIV
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