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Method for protecting ultrasonic probe

An ultrasonic and metal melt technology, applied in the field of material liquid processing, can solve the problems of poor processing effect, reduced energy, large acoustic impedance value of niobium alloy, etc., and achieve the effects of increasing agitation, reducing secondary oxidation, and simple equipment

Active Publication Date: 2019-06-11
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] People have also tried to use niobium alloy with high melting point to process the melt, but the acoustic impedance value of niobium alloy is relatively large, and the energy transmitted to the melt has been greatly reduced, so the treatment effect is relatively poor.

Method used

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  • Method for protecting ultrasonic probe
  • Method for protecting ultrasonic probe
  • Method for protecting ultrasonic probe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A. Alloy raw material configuration and smelting: put 0.36kg of industrially pure aluminum with a purity of 99.7% and 0.016kg of an aluminum-silicon master alloy with a silicon content of 24.4% into a melting furnace, and melt it into Al after 30 minutes -1%Si (the percentages used in the present invention are percentages by weight, the same below) melt 0.38kg, and overheated by 10°C;

[0067] B. Molten salt powder configuration and melting: take 32g of chemically pure reagent LiCl and CaCl 2 Get 18g according to (64%LiCl+36%CaCl 2 ) and mixed evenly, a total of 50g, heated and melted for 20 minutes to make it in a molten state, overheated to 80°C, and set aside for later use;

[0068] C, pour molten salt: the Al-1%Si melt that does not obtain step is poured in the crucible, then melted (64%LiCl+36%CaCl 2 ) The mixed molten salt is poured over the Al-1%Si melt, so that the molten salt maintains a height of 15mm above the melt;

[0069] D. Ultrasonic probe immersed in...

Embodiment 2

[0074] A. Alloy raw material configuration and smelting: Take 1kg of industrial pure aluminum with a purity of 99.7% and 0.14kg of an aluminum-silicon master alloy with a purity of 20% as a furnace charge, and put them in a melting furnace for 60 minutes to melt into Al- 2.5% Si melt, and superheated at 60°C;

[0075]B, molten salt powder configuration and melting: each get chemically pure reagent LiCl to be 80g, CaCl to be 40g, KCl to be 80g, pulverize and grind, and according to the ratio (40%LiCl+20%CaCl 2 +40%KCl) mixed evenly, 200g in total; after heating for 50 minutes, make it into a molten state, overheat at 45°C, and put it aside for later use;

[0076] C, pour molten salt: the Al-2.5%Si melt that step A obtains is poured in the crucible, then melted (40%LiCl+20%CaCl 2 +40% KCl) mixed molten salt is poured over the Al-2.5% Si melt, so that the molten salt maintains a height of 90 mm above the melt;

[0077] D. Ultrasonic probe immersed in molten salt: immerse the ul...

Embodiment 3

[0082] A. Alloy raw material configuration and smelting: 120kg of cast pig iron with the brand name Q12, 21.96kg of scrap steel with a carbon content of 0.2%, and 1.5kg of ferrosilicon with a silicon content of 75% are used as raw materials to prepare 144kg of gray cast iron, and the prepared The raw materials were put into a 200kW thyristor-controlled induction furnace, and after 90 minutes, the cast iron melt was melted and overheated at 100°C; the nominal composition of the gray cast iron prepared was as follows (the stated alloy compositions are all mass percentages, the same below ): C=3.5%; Si=1.8%; Mn=0.2%; S<0.03%; P<0.07%. Carbon equivalent = 4.1, close to eutectic composition cast iron.

[0083] B, molten salt powder configuration and melting: each get chemically pure reagent NaCl to be 200g, KCl to be 200g, AlF to be 100g, pulverize and grind, and according to the ratio (40%NaCl+40%KCl+20%AlF 3 ) mixed evenly, 500g in total; after heating for 90 minutes, it was in ...

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Abstract

The invention relates to the technical field of liquid processing of materials, in particular to a method for protecting an ultrasonic probe from damage and erosion while realizing indirect treatmentof a metal melt by propagating ultrasonic waves through mixed molten salt (or slag and a fluxing agent). The method comprises the following steps: A, alloy raw materials are prepared and smelted; B, molten salt powder is prepared and melted; C, the molten salt is poured; D, the ultrasonic probe is immersed in the molten salt; E, ultrasonic treatment is conducted; F, the ultrasonic probe is removed; and G, solidification forming or pouring is conducted. According to the technical scheme, the problems that in the prior art, an ordinary ultrasonic probe is very prone to cavitation thermal corrosion, the melt is polluted, the chemical compositions of the melt are changed, and the significance of ultrasonic treatment is lost; and the ultrasonic probe made of metal ceramic is excessively high incost and long in production cycle, is prone to being bumped and damaged, and needs to be fully preheated to avoid explosion due to the over-high temperature, and thus the ultrasonic probe has the requirements for care and cautiousness in operation to avoid damage are solved.

Description

technical field [0001] The invention relates to the technical field of material liquid processing, in particular to a method for protecting an ultrasonic probe from damage while using mixed molten salt (or slag, flux) to propagate ultrasonic waves to realize indirect treatment of metal melt. Background technique [0002] The research on ultrasonic treatment of metal melts began in 1926 with two Canadian scholars, R.W.Boyle and G.B.Taylor. [0003] Introduce elastic waves into the metal melt to generate many cavitation bubbles in the melt, and the H2 dissolved in the melt will escape into these microscopic cavitation bubbles to become the core of the bubbles, and then grow into bubbles , and finally escape the surface of the melt to achieve the purpose of degassing and refining. In addition, ultrasonic waves can also shatter crystal dendrites and refine alloy grains. When the power is sufficient, its range of action can reach the entire melt, which can not only eliminate ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/02
CPCY02P10/20
Inventor 李军文
Owner DALIAN JIAOTONG UNIVERSITY
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