摘要:
Made up of a step of preparing a map expressing a correlation between solid phase percentage and viscosity of a slurry-form semi-solid metal (27) for a given metal composition; a step of setting a target viscosity corresponding to a target solid phase percentage using this map; a viscosity measuring step of measuring the viscosity of a semi-solid metal in a vessel (13) while cooling it; and a step of carrying out cooling until this viscosity reaches the target viscosity, by these steps being carried out in from the preparation of the map expressing the correlation between solid phase percentage and viscosity of the semi-solid metal to the end of cooling of the semi-solid metal the solid phase percentage of the semi-solid metal is made to match the target solid phase percentage. Because the viscosity is detected, the affects of cooling rate changes and time can be eliminated, and it is possible to raise management accuracy of the solid phase percentage of the semi-solid metal much further than with related art management based on time.
摘要:
Made up of a step of preparing a map expressing a correlation between solid phase percentage and viscosity of a slurry-form semi-solid metal (27) for a given metal composition; a step of setting a target viscosity corresponding to a target solid phase percentage using this map; a viscosity measuring step of measuring the viscosity of a semi-solid metal in a vessel (13) while cooling it; and a step of carrying out cooling until this viscosity reaches the target viscosity, by these steps being carried out in from the preparation of the map expressing the correlation between solid phase percentage and viscosity of the semi-solid metal to the end of cooling of the semi-solid metal the solid phase percentage of the semi-solid metal is made to match the target solid phase percentage. Because the viscosity is detected, the affects of cooling rate changes and time can be eliminated, and it is possible to raise management accuracy of the solid phase percentage of the semi-solid metal much further than with related art management based on time.
摘要:
An apparatus for producing a metal formed product comprises a molten metal-holding furnace; a semisolidified metal-producing mechanism; a cooling member-restoring mechanism arranged adjacent to the semisolidified metal-producing mechanism, for applying a restoring treatment so that chillers have a desired function; a forming machine for forming semisolidified metal to have a predetermined shape; and an articulated robot capable of transporting a crucible to the molten metal-holding furnace, the semisolidified metal-producing mechanism, and the forming machine. The semisolidified metal-producing mechanism includes first to third agitators. The cooling member-restoring mechanism includes first to third treating sections. These components are arranged in a direction of back and forth movement of the articulated robot. Accordingly, it is possible to efficiently obtain the metal formed product having a high quality.
摘要:
A method for producing a low-dislocation InP single crystal suitably used for an optical device such as a semiconductor laser, and the low-dislocation InP single crystal wafer are provided. In a liquid-encapsulated Czochralski method in which a semiconductor raw material and an encapsulant are contained in a raw material melt containing part comprising a cylindrical crucible having a bottom, the raw material containing part is heated to melt the raw material, and a seed crystal is brought into contact with a surface of a melt of the raw material in a state of being covered with the encapsulant to grow a crystal while the seed crystal is raised; a crystal shoulder part is grown from the seed crystal by setting a temperature gradient in a crystal growth direction to 25° C./cm or less and setting a temperature-fall amount to 0.25° C./hr or more. Thus, an iron-doped or undoped InP single crystal wafer in which an area having a dislocation density of 500/cm2 or less occupies 70% or more is realized.
摘要翻译:提供适合用于半导体激光器等光学元件的低位错InP单晶的制造方法和低位错InP单晶晶片。 在包含具有底部的圆柱形坩埚的原料熔融物的部件中含有半导体原料和密封剂的液体封装的切克劳斯法中,加热含有原料的部分,使原料熔融, 在被密封剂覆盖的状态下与原料的熔体的表面接触以在晶种升高的同时生长晶体; 通过将晶体生长方向的温度梯度设定为25℃/ cm以下,将温度下降量设定为0.25℃/小时以上,从晶种生长晶面部。 因此,实现了具有500 / cm 2以下的位错密度的面积占70%以上的铁掺杂或未掺杂的InP单晶晶片。
摘要:
Provided is a method for synthesizing group II-VI compound semiconductor polycrystals in which synthesis can be accomplished without the use of a quart ampoule as the polycrystal synthesis vessel, and as a result it is possible to use a larger vessel without reducing yield, and costs can thereby be reduced. Two or more starting elements are introduced to a semi-airtight pBN inner vessel (6a), the inner vessel is introduced to a semi-airtight heat-resistant outer vessel (6b) and placed in a high-pressure furnace (1) having a heating means (7), the air inside the high-pressure furnace is evacuated and the furnace is filled with an inert gas under a predetermined pressure, the outer vessel and inner vessel are heated and the temperature is raised using the heating means, the starting elements inside the inner vessel are melted and reacted, and the temperature is then gradually lowered to promote growth of polycrystals.
摘要:
An electro luminescence device comprises a compound semiconductor crystal substrate comprising a Group 12 (2B) element and a Group 16 (6B) element in a periodic table. It is produced by providing a substrate having a low dislocation density or a low inclusion density; forming a pn junction by thermally diffusing an element converting the substrate of a first conduction type into the one of a second conduction type from a front surface of the substrate; and forming electrodes on front and rear of the substrate. A diffusion source including an element converting the substrate of a first conduction type into the one of a second conduction type is disposed on the front surface of the substrate, preventing forming of a defect compensating an impurity level which is formed in the substrate by the element during a diffusion process, and gettering impurity on the front surface of the substrate by the diffusion source. Thereby, the conduction type of the Group II-VI compound semiconductor can be controlled and the electro luminescence device having superior light emission characteristics can be stably produced.
摘要:
A wear-resistant compound roll having a shell portion produced by sintering a uniform mixture of alloy powder consisting essentially, by weight, of 1.2-3.5% of C, 2% or less of Si, 2% or less of Mn, 10% or less of Cr, 3-35%, as W+2Mo, of one or two of W and Mo, 1-12% of V, and balance Fe and inevitable impurities, and 1-15%, based on the weight of said alloy powder, of VC powder dispersed therein. This compound roll is produced by (a) uniformly mixing the alloy powder with the VC powder; (b) charging the resulting mixed powder into a metal capsule disposed around a roll core; and (c) after evacuation and sealing, subjecting said mixed powder to a HIP treatment.
摘要:
For an input signal with a ringing superposed thereon, a ringing-generating filter generates an analogous ringing waveform from only a peak portion of the signal which precedes the ringing. A subtractor subtracts the analogous ringing waveform from the input signal to eliminate the ringing. The coefficient of the filter is determined by applying a calculation method similar to a polynomial division based on the complete pivoting Gaussian elimination to polynomials using a reference data expressing a peak waveform and a ringing waveform, and by using a least squares method for minimizing the square of the covariance so as to allow the presence of noise in the data. Furthermore, by a repetitive process on a plurality of the same datasets, the calculation accuracy of the coefficient is improved even under the condition that the ringing frequency is high and the number of samples in one cycle is small.
摘要:
The present invention aims at providing a method and apparatus for analyzing a mass spectrum on which multivalent ion peaks originating from a target compound appear, and calculating the mass of the target compound. First, each peak on the mass spectrum is analyzed to detect isotopic clusters, and the valence and the representative point (m/z value) of each isotopic cluster are obtained (S1 through S3). Since the range of the m/z value of the component which is added to or desorbed from the compound is limited, by using this factor, the isotopic clusters originating from the same compound are deduced. By combining the deduced isotopic clusters, the candidates for the m/z value of the added/desorbed component are deduced (S5). Among the plurality of selected candidates, clearly abnormal candidates are eliminated by using a plurality of conditions such as the degree of distribution of the m/z values and the similarity of the relative intensities of the representative points of the isotopic clusters (S6 through S9). The candidate having the smallest distribution of m/z values or the candidate having the highest similarity of the relative intensities of the representative points is finally selected. After the m/z value of the added/desorbed component is determined, the mass of the compound is calculated (S10 through S16).
摘要:
For an input signal with a ringing superposed thereon, a ringing-generating filter (12) generates an analogous ringing waveform from only a peak portion of the signal which precedes the ringing. A subtractor (11) subtracts the analogous ringing waveform from the input signal to eliminate the ringing. The coefficient of the filter (12) is determined by applying a calculation method similar to a polynomial division based on the complete pivoting Gaussian elimination to polynomials using a reference data expressing a peak waveform and a ringing waveform, and by using a least squares method for minimizing the square of the covariance so as to allow the presence of noise in the data. Furthermore, by a repetitive process on a plurality of the same datasets, the calculation accuracy of the coefficient is improved even under the condition that the ringing frequency is high and the number of samples in one cycle is small. Thus, the ringing can be correctly eliminated even if the signal frequency is high.