Method of measuring a graphite article, apparatus for a measurement, and ingot growing system
Example embodiments relate to a method of measurement, an apparatus for measurement, and an ingot growing system that measure properties relating an induction heating characteristic of a graphite article. The method of measurement comprises an arranging step of arranging a graphite article to the coil comprising a winded conducting wire; and a measuring step of applying power for measurement to the coil through means of measurement connected electronically to the coil, and measuring electromagnetic properties induced in the coil. The method of measurement and the like measure electromagnetic properties of graphite articles like an ingot growing container, and an insulating material, and provide data required for selecting so that further enhanced reproducibility for growth of an ingot can be secured.
1. A method of measuring properties that relate to an induction heating characteristic of a graphite article, the method comprising:
an arranging step of arranging a graphite article to be able to be electromagnetically engaged with a coil comprising a winded conducting wire; and
a measuring step of applying power for measurement to the coil through a means of measurement connected electronically to the coil, thereby measuring electromagnetic properties induced to the coil,
wherein the coil has a perimeter length of an inner circumference, and
wherein the perimeter length (unit:mm) of the inner circumference and the sectional area (unit:mm 2 ) of conducting wires of the coil have a ratio of 100:1.57 to 161.
2. The method of in claim 1 ,
wherein the electromagnetic properties comprise a property relating to change of induced electromotive force generated in the coil by the graphite article or a property relating to resistance of the graphite article.
3. The method of in claim 1 ,
wherein the electromagnetic properties are one or more selected from the group consisting of equivalent series resistance, equivalent series inductance, and quality factor of the coil.
4. The method of in claim 1 ,
wherein the graphite article is an ingot growing container and/or an insulating material.
5. The method of in claim 4 ,
wherein the coil has accommodation space located in the internal,
the ingot growing container is arranged in the accommodation space, and
the insulating material is arranged in the external of the coil.
6. The method of in claim 5 ,
wherein the length of the accommodation space is 100 mm or more.
7. A method of measuring properties that relates to an induction heating characteristic of a graphite article comprises:
an arranging step of arranging a graphite article to be able to be electromagnetically engaged with a coil comprising a winded conducting wire; and
a measuring step of applying power for measurement to the coil through a means of measurement connected electronically to the coil, thereby measuring electromagnetic properties induced to the coil,
wherein a section of the coil has a thickness in x direction measured in x direction which is horizontal to the bottom or the top of the graphite article and a thickness in z direction measured in z direction which is the side direction of the graphite article and perpendicular to the x direction, and
wherein the coil has a flat spiral coil shape in which the thickness in x direction is the same with or greater than the thickness in z direction.
8. The method of in claim 7 ,
wherein the coil in the flat spiral coil shape has a perimeter length of an inner circumference,
wherein the perimeter length (unit:mm) of the inner circumference and the thickness (mm) of the conducting wire have a ratio of 100:0.194 to 1.09.
9. The method of in claim 7 ,
wherein the graphite article is an ingot growing container,
wherein the ingot growing container has a value of equivalent series resistance of 2.35Ω to 4.56Ω measured by applying AC power of 100 kHz and 0.1 A.
10. The method of in claim 1 ,
wherein the section of the coil has a thickness in x direction measured in x direction which is horizontal to the bottom or the top of the graphite article and a thickness in z direction measured in z direction which is the side direction of the graphite article and perpendicular to the x direction,
wherein the coil has an aircore coil shape in which the thickness in z direction is greater than the thickness in x direction.
11. The method of in claim 10 ,
wherein the coil in the aircore coil shape has a perimeter length of inner circumference,
wherein the perimeter length (unit:mm) and the thickness (mm) of the conducting wire has a ratio of 100:0.194 to 1.09.
12. The method of in claim 10 ,
wherein the graphite article is an ingot growing container,
wherein the ingot growing container has a value of equivalent series resistance of 3.50Ω to 7.24 measured by applying AC power of 100 kHz and 0.1 A.
13. The method of in claim 10 ,
wherein the graphite article is an insulating material,
wherein the insulating material has a value of equivalent series resistance of 10.57Ω to 14.16Ω measured by applying AC power of 100 kHz and 0.1 A.
14. A measuring apparatus, comprising:
a coil comprising a winded conducting wire; and
a means of measurement connected electronically to the coil,
wherein the means of measurement applies power for measurement to the coil thereby measuring electromagnetic properties of a graphite article,
wherein the electromagnetic properties are properties relating an induction heating characteristic,
wherein the coil has a perimeter length of an inner circumference, and
wherein the perimeter length (unit:mm) of the inner circumference and the sectional area (unit:mm 2 ) of conducting wires of the coil have a ratio of 100:1.57 to 161.
15. The apparatus of claim 14 ,
wherein the electromagnetic properties are one or more selected from the group consisting of equivalent series resistance, equivalent series inductance, and quality factor of the coil.
16. The apparatus of claim 14 ,
wherein the section of the coil has a thickness in x direction measured in x direction which is horizontal to the bottom or the top of the graphite article and a thickness in z direction measured in z direction which is the side direction of the graphite article and horizontal to the x direction,
wherein the coil has a flat spiral coil shape in which a thickness in x direction is the same with or greater than the thickness in z direction, or has an aircore coil shape in which the thickness in z direction is greater than the thickness in x direction.
17. An ingot growing system comprising a graphite article and a heating means thereby allowing a silicon carbide ingot to grow, comprises:
a body having internal space in which material is arranged; and
a silicon carbide seed arranged in an upper portion of the body or in the body,
wherein the graphite article is an ingot growing container or an insulating material,
the graphite article has a value of equivalent series resistance which is an electromagnetic indirect property measured by an apparatus of measurement,
the ingot growing container has a value of equivalent series resistance of 3.50Ω to 7.24Ω measured by applying AC power of 100 kHz and 0.1 A, and
the insulating material has a value of equivalent series resistance of 10.57Ω to 14.16Ω measured by applying AC power of 100 kHz and 0.1 A.
18. The ingot growing system in claim 17 ,
wherein the silicon carbide ingot is induced to grow in a rate of 100 mm/hr or more.
19. A measuring apparatus, comprising:
a coil comprising a winded conducting wire; and
a means of measurement connected electronically to the coil,
wherein the means of measurement applies power for measurement to the coil thereby measuring electromagnetic properties of a graphite article,
wherein the electromagnetic properties are properties relating an induction heating characteristic,
wherein the section of the coil has a thickness in x direction measured in x direction which is horizontal to the bottom or the top of the graphite article and a thickness in z direction measured in z direction which is the side direction of the graphite article and perpendicular to the x direction, and
wherein the coil has a flat spiral coil shape in which the thickness in x direction is the same with or greater than the thickness in z direction.