摘要:
A reusable heat transfer sheet in which adhesion can be enhanced when it is sandwiched between a heating unit and a radiator even with a low fixing pressure, a method for using the heat transfer sheet and a radiation structure equipped with the heat transfer sheet. The member composed of expansion graphite and being arranged between a heating unit (H) and a radiator has a bulk density lower than 1.0 Mg/m3. Since the bulk density is low, it is compressed easily even with a low pressing force when it is sandwiched between the heating unit (H) and the radiator and pressed, and adhesion is enhanced between them. Since thermal resistance from the heating unit to the radiator is decreased, effect of cooling the heating unit can be enhanced.
摘要:
[Problems] An object is to provide a mold release sheet, made of expanded graphite, that can achieve high product quality and that can remarkably improve the work efficiency and production yield when silicon carbide, aluminum nitride, or the like is produced by compressing. [Means for Solving the Problems] A mold release sheet (4) disposed between silica powder M and an inner face of an outer member 1b of a mold and made of expanded graphite, characterized in that: the gas permeability represented by the following equation (1) is 1.0 × 10 -4 cm 2 /s or less, Gas permeability = Q €¢ L / ”P €¢ A , where Q is the gas flow rate (Pa€¢cm 3 /s), ”P is the pressure difference (Pa) between two chambers, A is the gas transmission area (cm 2 ) of the mold release sheet, which is the area of a passage that allows the two chambers to communicate with each other, and L is the thickness (cm) of the mold release sheet.
摘要翻译:本发明的目的在于提供一种由膨胀石墨构成的脱模片,其能够实现高品质,并且能够通过压缩来制造碳化硅,氮化铝等时的作业效率和成品率显着提高。 用于解决课题的手段在二氧化硅粉末M与模具的外侧部件1b的内表面之间配置有由膨胀石墨构成的脱模片(4),其特征在于,气体透过率由下式 1)为1.0×10 -4 cm 2 / s或更低,气体渗透率= Q / L / L,其中Q是气体流量(Pa·cm 3 / s),“P是 A是两个腔室之间的压差(Pa),A是允许两个腔室彼此连通的通道面积的脱模片材的透气面积(cm 2),L是厚度(cm) )的脱模片。
摘要:
An object is to provide an expanded graphite sheet at the use stage that can prevent can prevent degradation in product quality and deterioration in product yield by inhibiting the expanded graphite sheet from containing impurities even when the expanded graphite sheet is actually used. An expanded graphite sheet at the use stage in a condition in which the expanded graphite sheet is packed with a packing material and thereafter removed from the packing material, characterized in that all of the amounts of Al, B, Be, Ca, Cu, Fe, Li, Mg. Ni, S, Ti, V, and Zn as determined by an ICP emission spectroscopy method, the amounts of K and Na as determined by an atomic absorption spectrometry method, and the amount of Si as determined by an absorption spectrophotometry method are at a level less than the detection limit.
摘要:
An expanded graphite sheet with improved tensile strength is provided. By using an expanded graphite sheet with improved tensile strength as a lining for a carbonaceous crucible, a method of protecting a carbonaceous crucible is provided that reduces work hours remarkably, makes it possible to cover the inner surface of the crucible without breaking the sheet or producing gaps, and is suitable for increasing the size of the crucible, and a single-crystal pulling apparatus is also provided. An expanded graphite sheet (10) is characterized in that a reinforcing material (12) comprising carbon fibers is formed in a laminate form on at least one side of a substrate (11) made of an expanded graphite material. Another feature is interposing the expanded graphite sheet (10) between a quartz crucible and a carbonaceous crucible in which the quartz crucible is placed, to use the expanded graphite sheet as a lining for covering an inner surface of the carbonaceous crucible.
摘要:
This invention provides an expanded-graphite sheet whose thermal conductivity in their surfacewise directions is relatively uniform and higher than its thermal conductivity in perpendicular direction and which can be produced efficiently at relatively low cost. Because the expanded-graphite sheet is made of expanded graphite alone and has the thermal conductivities in parallel direction of 350 W/(m·K) or more, its thermal conductivities in parallel direction is much higher than its thermal conductivity in perpendicular direction; therefore, it is suitable for the conduction and diffusion of heat. Besides, the expanded-graphite sheet can be produced easily, in a short time, efficiently, at relatively low cost.