Method and device for directionally solidifying liquid-solid interface based on alternating magnetic field modulation
A technology of alternating magnetic field and directional solidification, applied in the direction of self-solidification method, chemical instruments and methods, crystal growth, etc., can solve the problem of the decline of casting performance and product qualification rate, the large degree of dendritic trunk geometric center, and the interdendritic shrinkage. and other problems, to achieve the effect of easy operation, maintaining consistent crystal orientation, and reducing defects
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0019] see figure 1 and figure 2 , the method of modulating the liquid-solid interface of directional solidification based on the alternating magnetic field, is characterized in that an alternating magnetic field is added above the liquid-solid interface around the crystallizer, and the induced current and magnetic field in the melt are coupled together by the alternating magnetic field to generate electromagnetic Stirring force, the magnitude, direction and frequency of the electromagnetic stirring force are related to the properties of the melt itself, and the smooth solid-liquid interface of the melt can be obtained by modulating the magnitude, direction and frequency of the electromagnetic field.
Embodiment 2
[0021] This embodiment is basically the same as Embodiment 1, and the special features are as follows: the electromagnetic stirring force is only used to eliminate the temperature difference in the radial direction, and the Joule heating effect is negligible; the magnitude of the electromagnetic stirring force is related to the magnetic field intensity B of the alternating magnetic field 0 Related, the magnetic field strength where u A For Alvin speed ≈ 10 -2 m / s, μ is the magnetic permeability of the melt, and ρ is the density of the melt; the direction of the electromagnetic stirring force is adjusted by changing the distance L between the lower end of the induction coil (4) that generates the alternating magnetic field and the solid-liquid interface of the melt, The range of L is -10 ~ 10mm. The frequency of the electromagnetic stirring force Among them, σ is the electrical conductivity of the sample melt, δ is the skin depth of the solid sample, and the skin effect sh...
Embodiment 3
[0023] This embodiment includes graphite tube main heating body 1, furnace body 2, vacuum system 3, copper induction coil 4, graphite tube auxiliary heating body 5, liquid Ga-In coolant 6, cooling cylinder 7, boron nitride cover 8 , liquid phase sample 10, solid-liquid interface 11, heat insulation layer 12, solid phase sample 13, water cooling system 14, drawing system 15, frequency conversion induction power supply 16; the sample is a superalloy, its length is 150mm, and its diameter is 12mm.
[0024] The graphite tube main heating body 1 and the auxiliary heating body 5 are resistance heaters with a height of 200 mm and 5 mm respectively, the outer diameter of the crucible is 14 mm, the distance between the corundum crucible 9 and the graphite tube main heating body 1 is 2 mm, and the auxiliary heating body 5 is located at The distance between the lower end of the main heating body 1 and the corundum crucible 9 is 1 mm, the copper induction coil 4 is located 5 mm above the ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| length | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More