摘要:
There is disclosed a pyrolytic boron nitride container for accommodating a material serving as a source of molecular beams for molecular beam epitaxy, wherein the transmissivity of the pyrolytic boron nitride container with respect to light having a wave number of 2600 cm−1 to 6500 cm−1 has a profile such that the transmissivity changes in the height direction of the container. The pyrolytic boron nitride container can be manufactured through a simple process and at low cost. The pyrolytic boron nitride container can prevent material melt from rising along the inner wall surface and prevent splashed material melt from adhering to the upper portion of the container. Further, the pyrolytic boron nitride container can stabilize molecular beam epitaxial growth and improve the quality of epitaxial film.
摘要:
There is disclosed a pyrolytic boron nitride container used for a Boat method in which material melt is retained In the container, and a crystal is grown while a temperature gradient is imparted to the material melt. The transmissivity of the pyrolytic boron nitride container with respect to light at a wave number ranging from 3700 cm.sup.-1 to 6500 cm.sup.-1 has a profile such that the transmissivity monotonously changes in the longitudinal direction of the container. The transmissivity profile is produced by imparting a pressure profile during manufacture of the container through deposition of pyrolytic boron nitride, by roughing the outer surface of the container such that the surface roughness has a profile, or by compounding pyrolytic boron nitride with a different material. It becomes possible to facilitate generation of a temperature gradient in material melt within the container and to facilitate control of a temperature profile in the container.
摘要:
A pyrolytic boron nitride crucible is disclosed which is suitable for producing a single crystal of a semiconductor compound of Group III and V by the LEC method. The crucible comprises a side part and a bottom part. The bottom part has an absorption coefficient of light of wavelengths between 3,700 cm.sup.-1 and 6,500 cm.sup.-1 of at most 1.7 and/or the absorption coefficient of light of wavelengths between 3,700 cm.sup.-1 to 6,500 cm.sup.-1 of the bottom part is less than that of the side part by at least 0.5. In the crucible, the heat conduction from the bottom part to material melt in the crucible is strengthened, so that the convection flow of the material melt is suppressed and the temperature distribution in the crucible can be easily controlled.
摘要:
A ceramic heater including a plate member made of insulating ceramics in which one or more pair(s) of through-holes are formed, a rod member made of conductive ceramics with a power-supply terminal at one end. The rod member is inserted into the through hole in the plate member. A conductive layer made of conductive ceramics is formed on the plate member; and a coating layer made of insulating ceramics is formed on the conductive layer. One end face of the rod member has a same plane with a main surface of the plate member, the conductive layer has a heater pattern formed on the main surface of the plate member, and the rod members are electrically insulated not to be short-circuited to each other in the opposite main surface.
摘要:
There is disclosed a ceramic heater 11 comprising: a plate member 12 made of insulating ceramics in which one or more pair(s) of through-holes 13 are formed; a conductive layer 19 made of conductive ceramics; and a coating layer 21 made of insulating ceramics; wherein a joint member 14 made of conductive ceramics is inserted into the through-hole; an end face 16 of the joint member has a same plane with a main surface 15 of the plate member; the joint member is coated with the conductive layer 19 and thereby fixed to the plate member and also connected with the conductive layer having a heater pattern 20; and an opposite side of the joint member projects from the plate member and the projecting portion 18 constitutes a terminal on which the coating layer is not formed. There can be provided a ceramic heater by which an object to be heated being put directly thereon can be heated uniformly and of which heating efficiency is high and in which the heater main body is not large in size and is compact and scattering of impurities or particles is small and which has a long operating life and is inexpensive.
摘要:
There is disclosed a heating element 10 comprising: a single-piece heat-resistant base member 1 with a plate portion la in which a heater pattern 3a is formed, a rod portion 1b extending from one surface of the plate portion la and in which a current-carrying part 3b is formed, and an end portion 1c at an end of the rod portion 1b on the opposite side of the plate portion la and in which a power-supply terminal 3c is formed; a dielectric layer 2 with insulating property on the surface of the heat-resistant base member 1; a conductive layer 3 with conductive property on the dielectric layer 2, in which the conductive layer 3 is formed as the heater pattern 3a in the plate portion 1a, as the current-carrying part 3b in the rod portion 1b, and as the power-supply terminal 3c in the end portion 1c; and a protection layer 4 with insulating property which covers the surface of the heater pattern 3a and the current-carrying part 3b, in which the dielectric layer 2, the conductive layer 3 and the protection layer 4 are formed to unite with the heat-resistant base member 1. There can be provided a heating element resistant to corrosion of a power-supply terminal, with a long-life protection layer, with high durability, compact in size, and capable of being produced at a low cost.
摘要:
There is disclosed a heating element 10 comprising: a single-piece heat-resistant base member 1 with a plate portion 1a in which a heater pattern 3a is formed, a rod portion 1b extending from one surface of the plate portion 1a and in which a current-carrying part 3b is formed, and an end portion 1c at an end of the rod portion 1b on the opposite side of the plate portion la and in which a power-supply terminal 3c is formed; a dielectric layer 2 with insulating property on the surface of the heat-resistant base member 1; a conductive layer 3 with conductive property on the dielectric layer 2, in which the conductive layer 3 is formed as the heater pattern 3a in the plate portion 1a, as the current-carrying part 3b in the rod portion 1b, and as the power-supply terminal 3c in the end portion 1c; and a protection layer 4 with insulating property which covers the surface of the heater pattern 3a and the current-carrying part 3b, in which the dielectric layer 2, the conductive layer 3 and the protection layer 4 are formed to unite with the heat-resistant base member 1. There can be provided a heating element resistant to corrosion of a power-supply terminal, with a long-life protection layer, with high durability, compact in size, and capable of being produced at a low cost.
摘要:
There is disclosed a PBN container in which a conductive film is deposited on a surface of a body formed by depositing PBN (pyrolytic boron nitride), wherein, at least, an angle between a PBN cut face of the body and at least one wall surface adjacent to the PBN cut face is 20°-80°, and a method for producing a PBN (pyrolytic boron nitride) container comprising at least steps of depositing PBN to form a body, processing a PBN cut face of the formed body so that at least, an angle between the PBN cut face and at least one wall surface adjacent to the PBN cut face is 20°-80°, and coating a surface of the processed body with a conductive film. Thus, there can be provided a PBN container excellent in durability where a conductive film is laminated on a surface of a body formed by depositing PBN, and a method for producing the PBN container.
摘要:
There is disclosed a PBN container in which a conductive film is deposited on a surface of a body formed by depositing PBN (pyrolytic boron nitride), wherein, at least, an angle between a PBN cut face of the body and at least one wall surface adjacent to the PBN cut face is 20°-80°, and a method for producing a PBN (pyrolytic boron nitride) container comprising at least steps of depositing PBN to form a body, processing a PBN cut face of the formed body so that at least, an angle between the PBN cut face and at least one wall surface adjacent to the PBN cut face is 20°-80°, and coating a surface of the processed body with a conductive film. Thus, there can be provided a PBN container excellent in durability where a conductive film is laminated on a surface of a body formed by depositing PBN, and a method for producing the PBN container.
摘要:
There is disclosed a ceramic heater 11 comprising: at least a plate member 12 made of insulating ceramics in which one or more pair(s) of through-holes 13 are formed; a rod member 14, being made of conductive ceramics, having a power-supply terminal 18 at one end thereof, and being inserted into the through-hole 13 at another end thereof; a conductive layer 19 made of conductive ceramics formed on the plate member 12; and a coating layer 21 made of insulating ceramics formed on the conductive layer; wherein one end face 16 of the rod member has a same plane with a main surface 15 of the plate member; the conductive layer 19 having a heater pattern 20 is formed on the main surface 15 of the plate member having the same plane; and the rod members 14 are electrically insulated not to be short-circuited to each other in the opposite main surface 17. There can be provided a ceramic heater by which an object to be heated being directly put thereon can be heated uniformly and of which heating efficiency is high and in which the heater main body is not large in size and is compact.