摘要:
In a method of heat treating a wafer obtained by slicing a silicon single crystal ingot manufactured by the Czochralski method, a rapid heating/cooling heat treatment is carried out by setting a holding time at an ultimate temperature of 1200° C. or more and a melting point of silicon or less to be equal to or longer than one second and to be equal to or shorter than 60 seconds in a mixed gas atmosphere containing oxygen having an oxygen partial pressure of 1.0% or more and 20% or less and argon, and an oxide film having a thickness of 9.1 nm or less or 24.3 nm or more is thus formed on a surface of the silicon wafer.
摘要:
A fixing member for an implant which comprises a tube or a pillar made of an hydroxyapatite ceramics at least one part of which is a ceramics porous article consisting essentially of a hydroxyapatite formed by agitation foaming, in which a number of approximately spherical pores mutually contact having pore structures communicated three-dimensionally opened at the contact area and having an averaged porosity of from 65% to 85%. A method for fixing an implant comprising a step of inserting an implant whose at least one part of the periphery is integrated with a hydroxyapatite ceramics into an implant insertion site of an alveolar bone or a gnathic bone. A method for fixing an implant, a fixing member for the implant and an implant composite in order to reinforce an implant insertion site by compensating or regenerating an alveolar bone or a gnathic bone on an implant treatment in dentistry or in oral surgery is obtained.
摘要:
Ceramic particles capable of increasing the reaction area with an eluate, etc. without decreasing the diameter of the particle per se and a producing method thereof are provided. A ceramic particles 10 of the present invention has an average particle diameter of 5 μm or more and 5 mm or less and a plurality of open pores formed at the outer surface, and has two pore size distributions in the measurement by a mercury porosimeter, in which the two pore size distributions includes a first pore size distribution having a peak within a range of 300 nm or more and 20 μm or less and a second pore size distribution having a peak in a range of 200 nm or less.
摘要:
The crucible for melting silicon according to the present invention is a crucible for melting silicon including a crucible main body including a heat-resistant member, and a protective film formed at least on an inner surface of the crucible main body, in which the protective film has a composition of SiOXNY in which X>0 and Y>0. The crucible for melting silicon according to the present invention has excellent releasability to a silicon block, reduces the amount of impurities dissolved in a silicon melt, and can be produced at low cost. Furthermore, the present invention provides a release agent for use in the production of the crucible for melting silicon.
摘要:
The invention intends to obtain a transparent yttrium oxide sintered body of which in-line transmittance in a visible wavelength region of 400 to 800 nm at a thickness of 1 mm is 60% or more, without using aluminum that readily segregates in grain boundaries of yttrium oxide, without using special raw materials in which a silicon content is particularly reduced and without finely pulverizing raw materials. A transparent yttrium oxide sintered body that contains, with yttrium oxide as a main component, at least either one of tantalum or niobium or both thereof and has the in-line transmittance of 60% or more at a thickness of 1 mm in a visible wavelength region in the range of 400 to 800 nm.
摘要:
A single crystal pulling apparatus having a heater 4 melting material silicon by thermal radiation from a cylindrical exothermic part 4a which surrounds a crucible 3 inside a furnace body 2 and an electromagnet 13 which is prepared to surround the furnace body 2 and applies a transverse magnetic field to the silicon liquid melt in the crucible 3 is provided. A length h in a pull-up axis direction in the exothermic part 4a of the heater 4 is arranged to be 0.5 times to 0.9 times an inner diameter of the crucible 3, a first middle position in the pull-up axis direction in the exothermic part 4a is arranged below a second middle position in the pull-up axis direction in the electromagnet 13, and a distance difference d between the first and second middle positions is 0.15 times to 0.55 times the inner diameter R of the crucible 3.
摘要:
Provides is a compound semiconductor substrate about which the thickness of its nitride semiconductor single crystal layer can be made large while the generation of cracks, crystal defects or the like is restrained in the nitride semiconductor single crystal layer. The substrate has a first intermediate layer 110 formed on a Si single crystal substrate 100 having a crystal plane orientation of {111}. In the layer 110, a first metal compound layer 110a made of any one of TiC, TiN, VC and VN, and a second metal compound layer 110b made of any one of compounds which are different from the compound of the first metal compound layer out of TiC, TiN, VC and VN are laminated in this order alternately each other over the Si single crystal.
摘要:
A method of pulling up a silicon single crystal is provided in which a variation rate of a neck diameter is controlled to be within a predetermined range, and a dislocation in a neck is eliminated. When pulling up the silicon single crystal, a single crystal with a predetermined crystal diameter is grown by bringing a seed crystal into contact with a material silicon melt, pulling up the seed crystal, growing the neck, and then increasing a diameter. The above-mentioned neck diameter is increased and decreased to grow the neck, during which a neck diameter variation rate is greater than or equal to 0.05 and less than 0.5, assuming that a value obtained in such a manner that a neck diameter difference (A−B) between adjoining inflection points is divided by a neck length L between the above-mentioned inflection points P1 and P2 is the neck diameter variation rate.
摘要:
A micro channel structure body 10 in which a micro channel 3 having a predetermined cross-sectional shape is formed in a laminate where substrates 1a, 1b, and 1c having formed thereon electrodes 2a, 2b, and 2c made of a thin film are laminated sequentially. The above-mentioned micro channel 3 is formed in a perpendicular direction β perpendicular to a lamination direction α of the above-mentioned laminate. Inner surfaces 3a and 3b of the above-mentioned micro channel 3 have an acute angle θ with respect to the lamination direction α of the above-mentioned laminate. The above-mentioned plurality of electrodes 2a, 2b, and 2c are formed and exposed in the lamination direction α of the inner surfaces 3a and 3b of the above-mentioned micro channel 3.
摘要:
A surface cleaning method of a semiconductor wafer heat treatment boat that can prevent metallic contamination to semiconductor wafers and keep down a production time and manufacturing costs of semiconductor wafers by efficiently and easily removing metallic impurities in an oxide film on an SiC boat surface is provided. A surface cleaning method of a semiconductor wafer heat treatment boat according to an embodiment of the present invention is a surface cleaning method of a semiconductor wafer heat treatment boat whose surface is formed of SiC, includes oxidizing the surface of the heat treatment boat by thermal oxidation and etching a portion of the oxide film formed after oxidation is removed.