摘要:
A heat resistant and wear resistant iron-base sintered alloy to be used as the material of a valve seat and a valve face of an engine valve and a waste gate valve of a turbocharger for an internal combustion engine. The iron-base sintered alloy consists essentially of at least one of molybdenum and tungsten, ranging from 3 to 25% by weight, chromium ranging from 1 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 2.5% by weight, boron ranging from 0.5 to 2.0% by weight, intermetallic compound of TiAl ranging from 0.3 to 20% by weight, and balance including iron and impurities. In the sintered alloy, carbide, boride and/or carbide boride and TiAl are uniformly dispersed in the matrix, thereby strengthening grain boundary.
摘要:
A sintered ferro alloy comprises 5 to 25 wt % of one or two elements selected from Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one element selected from borides of La, Ce, Nd, Sm, Eu, Gd, Yb, Y or Sc, residual Fe, and contaminants. Also the alloy may comprise less than or equal to 20 wt % of at least one element selected from V, Nb, Ta, Ti, Zr, Hf, Co or Ni, if necessary. The alloy is produced by mixing the above mentioned components and pressurizing them in an Fe matrix, then sintering the pressurized mixture at 1150.degree. C. to 1260.degree. C. for 60 min. and reheating after sintering. This alloy has wear and heat resistance and can be utilized as valve seats for internal combustion engines in automotive vehicles.
摘要:
A high temperature wear resistant sintered alloy suitable for the material of a valve seat in an automotive vehicle engine. The matrix of the sintered alloy consists essentially of carbon ranging from 0.45 to 1.15% by weight, nickel ranging from 5.4 to 27% by weight, molybdenum ranging form 0.4 to 2.7% by weight, cobalt ranging from 4.2 to 7.2% by weight and balance being substantially iron. The matrix is formed of a mixture of at least one of sorbite structure and bainite structure and austenite structure. Furthermore, the matrix includes hard phase dispersed therein and containing at least silicon, molybdenum and cobalt. The sintered alloy of such a structure can exhibit high strength and wear resistance at high temperatures regardless of type of engine and kind of fuel in case of being used as the material of the valve seat, while maintaining production cost thereof lower.
摘要:
A wear resistant iron-base sintered alloy consists essentially of at least one selected from the group consisting of molybdenum and tungsten, ranging from 5 to 20% by weight, chromium ranging from 2 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 0.8% by weight, boron ranging from 0.5 to 2.0% by weight, and balance including iron and an impurity, so that fine multiple carbide, multiple boride, and/or multiple carbide-boride can be homogeneously dispersed as hard grains in the structure of a matrix, thereby exhibiting excellent wear resistance, scuffing resistance and pitting resistance.
摘要:
Wear-resistant, sintered iron alloys are provided. The alloys have a structure in which iron-based hard particles having a relatively high Cr content and copper or copper alloy particles are dispersed in an iron alloy matrix containing a relatively low content of Cr. The alloys are prepared by compression molding powders of the matrix alloy, the hard alloy, copper or copper alloy, an Fe-P alloy and graphite and sintering the obtained molding at a temperature of 980.degree. to 1130.degree. C.
摘要:
A material, and a process for producing same, for fabricating components of valve-actuating mechanisms of internal combustion engines, the material comprising an iron-base sintered alloy, which comprises, by weight: 2-7% Cr (chromium); 0.1-1.5% Mo (molybdenum); 0.5-7% W (tungsten); 0.1-3% V (vanadium); and 0.5-3% C (carbon). Upon being subjected to a slide-contact with another member, the material exhibits a high degree of abrasion resistance and at the same time is capable of effectively protecting the material of a member operatively cooperating therewith in slide-contact. The material is thus highly suitable for very frequent slide-contact with a cam member or the like.
摘要:
An iron-based sintered sliding product having improved contact fitness and resistance to wear, in which 0.1 to 3 wt. % free graphite and Fe--P--C ternary alloy phase of hardness MHv 300 to 850 having over 3% to 20% of area are dispersed into an iron-based matrix containing either one selected from 0.1 to 1 wt. % Sn and 0.1 to 1 wt. % Zn, and 1 to 10 wt. % Cu and 0.3 to 1 wt. % C. As a modified embodiment of the present invention, an alloy containing Fe--Mo as a main component may be dispersed into the iron-based matrix in place of the aforesaid Fe--P--C ternary alloy phase. Said Fe--P--C ternary alloy phase may be prepared by mixing a single metal element, Fe, C and P into the powdered raw material of the iron-based matrix. Alternatively, said Fe--P--C ternary alloy phase may be prepared by mixing Fe--P--C alloy powder into the powdered raw material of the iron-based matrix. Further, an alloy containing Fe--Mo as a main component may be prepared by mixing Fe--Mo--Si alloy powder into the powdered raw material of the iron-based matrix.
摘要:
An image forming apparatus includes a developing device. The developing device includes a toner carrier (developing roller). The developing roller includes a base member, electrode bars, a pair of electrodes, and a protection layer. The base member includes a conductive core and an insulating layer formed on the outer surface of the core. The electrode bars and the pair of electrodes are made of a conductive metal, and are provided on the outer surface of the insulating layer. The electrode bars and the pair of electrodes are formed in a way that an unnecessary portion of a metal film is irradiated with a laser beam and thus is removed. The electrodes are each formed helically on the outer surface of the base member 1 and formed to taper down toward the outmost side thereof in its cross section.
摘要:
Disclosed is a technology that specifies each of a plurality of two-dimensional codes in an image and reduces the processing time for judging color in each cell region in each specified two-dimensional code. Based on edge images generated from obtained images, candidate regions among these edge images are extracted, a judgment is made about whether or not a characteristic pattern is included in each of the corresponding regions in the original images that correspond to these extracted candidate regions, and then the two-dimensional code regions are detected from among the original images. The color is judged both for each pixel group that comprises each row of that region and for each pixel cell, in pixel array order. If it is determined that a certain number or more pixels in each row that corresponds to each cell region are included in the color judgment region, color judgment is omitted for the remaining pixels in that row.
摘要:
A two-dimensional code reader and program generate edge images based on obtained images, extract candidate regions within these edge images, determine whether or not the extracted candidate regions are valid, determine whether or not characteristic patterns are included in each corresponding region in the original image, and then detects two-dimensional code regions within original images. The two-dimensional code reader and program repeatedly implement generation of edge images based on conversion conditions that correspond to the applicable order among a plurality of conversion condition types in a pre-set order, detection of candidate regions among the generated edge images, determination of whether or not the extracted candidate regions are valid, determination of whether or not characteristic patterns are included in the corresponding regions in the original images that correspond to valid candidate regions, and detection of two-dimensional code regions.