Abstract:
The present invention provides a rotor, a shaft or a sample holder for a centrifugal sintering system, and the present invention relates to a ceramic member for a centrifugal sintering system which is a member consisting of a rotor, a shaft or a sample holder for use in a centrifugal sintering system imparting a centrifugal force field and a temperature field to a molded body of ceramics or metal powder or a ceramic precursor film wherein a rotor for turning a sample holder, a shaft or a sample holder is composed of ceramics, to the ceramic member wherein the rotor which turns the sample holder is composed of conductive silicon carbide ceramics and the rotor alone is selectively caused to self heat by induction heating means to indirectly heat the sample, and to the ceramic member wherein the sample holder is composed of a material with a large dielectric loss and the sample holder alone is selectively heated using dielectric heating means to indirectly heat the sample.
Abstract:
The present invention is to produce an aluminum nitride powder which is turned into a sintered body at a temperature of not more than 1600° C., thereby obtaining a sintered aluminum nitride in which the density and thermal conductivity are high and which can be properly used as a substrate material. Using a vapor phase reaction apparatus shown in FIG. 1, ammonia gas was fed from a reactor 2 heated at from 300 to 500° C. and maintained at that temperature by a heating section 1 via a feeding tube 4 while being regulated by a flow regulator 3. At the same time, while being regulated by the flow regulator 5, nitrogen gas containing an organic aluminum compound is fed via a feeding tube 6 to obtain an aluminum nitride powder. The aluminum nitride powder is subjected to a heat treatment at from 1100 to 1500° C. in a reducing gas atmosphere and/or an inert gas atmosphere to obtain an aggregate aluminum nitride powder. The aggregate aluminum nitride powder is subjected to a mechanical treatment to obtain an aluminum nitride powder in which the specific surface area value is not less than 30 m2/g and a ratio of an average particle diameter to a particle diameter in terms of the specific surface area is not more than 10.
Abstract:
A method and an apparatus for sintering a compact of particulate material for a ceramic or of particles of a metal, or a ceramic precursor film, wherein the sintering is performed by heating and burning the compact or the ceramic precursor film while applying centrifugal force to the compact or the ceramic precursor film.
Abstract:
[Problem] It is an object to provide a joining method that enables to join aluminum nitride sinters together efficiently and tightly.[Means for solution] A method of joining an aluminum nitride sinter includes placing an inclusion including a sintering aid between a surface to be joined of one aluminum nitride sinter and a surface to be joined of the other aluminum nitride sinter, and heating the inclusion by electromagnetic wave irradiation, thereby joining the aluminum nitride sinters together.
Abstract:
A process for producing a ceramic sinter or inorganic film in which anisotropic particles or anisotropic crystals have been oriented; or a process for producing a bonded composite material which comprises a base sample and another material tenaciously bonded to a surface of the base. The processes are characterized by imposing a centrifugal force during buming (heating).
Abstract:
A steel for machine structural use which comprises, on the percent by mass basis, C: 0.1 to 0.6%, Si: 0.01 to 2.0%, Mn: 0.2 to 2.0%, S: 0.005 to 0.20%, P: not more than 0.1%, Ca: 0.0001 to 0.01%, N: 0.001 to 0.02% and Al: not more than 0.1%, with the balance being Fe and impurities, with a value of [Ca]e defined by [Ca]e=T.[Ca]−(T.[O]/(O)ox)×(Ca)ox of not more than 5 ppm or with a proportion of MnO contained in oxide inclusions of not more than 0.05 and a value of Ca/O of not more than 0.8 is excellent in machinability and, therefore, it can be used as a steel stock for various machine structural steel parts, such as in industrial machinery, construction machinery and conveying machinery such as automobiles. It is substantially free of Pb, hence suited for use as a steel friendly to the global environment. [Ca]e is the effective Ca concentration index (ppm by mass), T.[Ca] and T.[O] are the contents of Ca and O, respectively, in ppm by mass, and (O)ox and (Ca)ox are the proportions of O and Ca contained in oxide inclusion, respectively.
Abstract:
The present invention is directed to a steel product for machine structural use having excellent machinability and to a structural steel part for machinery manufactured from the steel product. More particularly, the invention is directed to a steel product for machine structural use having excellent machinability, particularly bringing about excellent “drill life” and exhibiting excellent “chip disposability” in the course of drilling, as well as to a structural steel part for machinery manufactured from the steel product. The steel product for machine structural use has a chemical composition comprising, in mass percent, C: 0.05% to 0.55%; Si: 0.50% to 2.5%; Mn: 0.01% to 2.00%; P: not greater than 0.035%; S: 0.005% to 0.2%; N: not greater than 0.0150%; elements to be added as needed: Cu, Ni, Cr, Mo, V, Nb, Ti, B, Al, Bi, Ca, Pb, Te, Nd, and Se; −23C+Si(5−2Si)−4Mn+104S−3Cr−9V+10≧0; 3.2C+0.8Mn+5.2S+0.5Cr−120N+2.6Pb+4.1Bi−0.001&agr;2+0.13&agr;≧3.0; and balance: Fe and incidental impurities; percentage of ferrite in microstructure being 10% to 80%; and Hv hardness being 160 to 350. In the above expressions, &agr; represents the area percentage in % of a ferrite phase in the microstructure. The structural steel part for machinery can be manufactured relatively easily from the steel product for machine structural use through machining.
Abstract:
[Problem] It is an object to provide a joining method, whereby even ceramics having an extremely small dielectric loss factor such as aluminum nitride can be joined efficiently and tightly.[Means for Resolution] A method of joining ceramics of the present invention is a method of heating ceramics of the same kind or different kinds by inducing self-heating of the ceramics by electromagnetic wave irradiation and thereby joining the ceramics together, and includes preheating a surface to be joined of the ceramic by a heating means that includes an auxiliary heating means other than the self-heating.
Abstract:
The present invention is to produce an aluminum nitride powder which is turned into a sintered body at a temperature of not more than 1600° C., thereby obtaining a sintered aluminum nitride in which the density and thermal conductivity are high and which can be properly used as a substrate material.Using a vapor phase reaction apparatus shown in FIG. 1, ammonia gas was fed from a reactor 2 heated at from 300 to 500° C. and maintained at that temperature by a heating section 1 via a feeding tube 4 while being regulated by a flow regulator 3. At the same time, while being regulated by the flow regulator 5, nitrogen gas containing an organic aluminum compound is fed via a feeding tube 6 to obtain an aluminum nitride powder. The aluminum nitride powder is subjected to a heat treatment at from 1100 to 1500° C. in a reducing gas atmosphere and/or an inert gas atmosphere to obtain an aggregate aluminum nitride powder. The aggregate aluminum nitride powder is subjected to a mechanical treatment to obtain an aluminum nitride powder in which the specific surface area value is not less than 30 m2/g and a ratio of an average particle diameter to a particle diameter in terms of the specific surface area is not more than 10.
Abstract:
The invention provides a steel for machine structural use, which is excellent in machinability, comprising, in percent by mass, C: 0.1-0.6%. Si: 0.01-2.0%, Mn: 0.2-2.0%, S: 0.005-0.2%, Al: not more than 0.009%, Ti: not less than 0.001% but less than 0.04%, Ca: 0.0001-0.01%, O (oxygen): 0.0010-0.01%, and N: not more than 0.02% and satisfying the following relations (1) to (3): n0/S (%)≧2500 (1) n1/n0≦0.1 (2) n2≧10 (3) where n0: total number of sulfide inclusions not smaller than 1 &mgr;m per mm2 of a cross section parallel to the direction of rolling (number/mm2); n1: number of MnS inclusions having not smaller than 1 &mgr;m and containing not less than 1.0% of Ca per mm2 of a cross section parallel to the direction of rolling (number/mm2); n2: number, per mm2 of a cross section parallel to the direction of rolling, of oxide inclusions having a specific composition comprising CaO—Al2O3—SiO2—TiO2 and having a diameter of not less than 1 &mgr;m (number/mm2).
Abstract translation:本发明提供一种机械加工性优良的机械结构用钢,以质量%计含有C:0.1-0.6%。 Si:0.01〜2.0%,Mn:0.2〜2.0%,S:0.005〜0.2%,Al:0.009%以下,Ti:0.001%〜0.04%,Ca:0.0001-0.01% (氧):0.0010-0.01%,N:不大于0.02%,满足以下关系式(1)〜(3):其中n0:不小于1mum / mm 2的硫化物夹杂物的总数 横截面与轧制方向平行(数/ mm 2); n1:不小于1um的MnS夹杂物的数量,并且含有不小于平均于轧制方向的截面的每mm 2的Ca的1.0%(数/ mm 2); n2:具有包含CaO-Al 2 O 3 -SiO 2 -TiO 2并且直径不小于1μm的特定组成的氧化物夹杂物的平均于轧制方向的横截面的mm 2的数量(数/ mm 2) 2>)。