35 results about "Vickers hardness test" patented technology

To suppress breakage of glass for an electric lamp in a process in which the glass that has already been formed is processed further, a glass composition for an electric lamp is provided. The glass composition contains, expressed in mol %, 70 to 85% of SiO2, 12 to 17% of R2O, and 2 to 8.5% of MO (where R represents at least one selected from Li, Na and K, and M represents at least one selected from Mg, Ca, Sr, Ba, Zn and Pb). In the glass composition, the respective contents of CaO, MgO, BaO and SrO satisfy the relationship, CaO+MgO>BaO+SrO. The glass composition has a brittleness index value B determined by the Vickers hardness test of 7,000 m<-1 / 2>. Preferably, the contents of SrO and BaO are 0 to 0.5% and 0.1 to 1%, respectively. More preferably, the respective contents of K2O and Na2O satisfy the relationship, K2O>Na2O.

A testing machine includes a stand and a test device. The stand includes a base, box frame, a slide device driven to slide by a motor, and a control system controls the force applied on the test specimen. The test device is coupled at the slide device for performing various hardness tests consisting of Rockwell hardness test, Vickers hardness test, Brinell hardness test, micro-hardness test, and tension-compression test. The test device includes a force sensor and a data processing circuit converting an analog signal of the force sensor into digital data to interface with the control system.

The invention provides a Rockwell hardness judging method of a thin-specification Cr-Ni system austenite stainless steel plate. The Rockwell hardness judging method is characterized by comprising the following steps of: (1) selecting two groups of products produced by one unit, wherein the thickness of each product in the first group is more than 1.50mm and the first group comprises at least 50 products; the thickness of each product in the second group is less than or equal to 1.50mm and the second group comprises at least 50 products; (2) testing the first group of products by using a method specified by Metal Material Rockwell Hardness Testing Method to obtain a hardness number HRB average value in production; (3) obtaining a metallic Vickers hardness number HV average by testing the second group of products according to Metal Material Vickers Hardness Test; and (4) judging by utilizing a formula HRB=HV / 1.98: if the HRB=HV / 1.98 meets goods ordering standard requirements, judging that the thin-specification Cr-Ni system austenite stainless steel plate is qualified; and if the HRB=HV / 1.98 does not meet the goods ordering standard requirements, judging that the thin-specification Cr-Ni system austenite stainless steel plate is unqualified. The Rockwell hardness judging method disclosed by the invention solves the difficulty of a thin sheet plate HRB test.

The invention discloses a method for achieving plasticity parameter parametric inversion recognition of a welding nuclear area material. The method comprises the following steps: testing the Vickers hardness of a material to be tested so as to obtain force-depth data, establishing a fitness optimization function, performing parameter optimization on a particle group algorithm according to the fitness optimization function, and performing recognition by using the optimized particle group algorithm, thereby obtaining optimal fitting plasticity parameters of the material to be tested. By adopting the method, the recognition precision and efficiency of plasticity parameters of materials can be remarkably improved, and a foundation can be made for improving the CAE (Computer Aided Engineering) simulation precision of a welding point structure.

A steel sheet for coal / ore carrier holds that is a ferrite-pearlite steel sheet of specified components, wherein: the microstructure is a structure configured with the ferrite area fraction in the 1 4thickness region being 80-95% and the pearlite area fraction at the 1 4 thickness region being 5-20%, the average aspect ratio of the ferrite grains in the 1 4 thickness region being 1.0-1.5, the average grain size of the ferrite grains in the 1 4 thickness region being 5-20 microns, and the average dislocation density in the ferrite in the 1 4 thickness region being 7*10<12> / m2 or less; in a 1 mm pitch Vickers hardness test, the average Vickers hardness from the steel sheet surface to the 1 4 thickness region or from the 3 4 thickness region to the back surface is 80-105% of the average Vickers hardness from the 1 4 thickness region to the 3 4 thickness region; and the maximum Sn concentration in the 1 2 thickness (sheet thickness) + / - 10% range in the sheet thickness direction is 0.01-5.0%.

The invention relates to metal coating technology, and provides a method for detecting the bonding quality of a metal thin film coating, comprising: using a Vickers hardness tester to carry out indentation loading on a sample to be tested; comparing the observed coating morphology with a reference map Compare and evaluate the bonding quality level of the coating. Adopting the technical solution of the present invention, there is little restriction on the size, which is suitable for the research and judgment of the coating bonding quality of thin materials and small-sized samples, and can also test large-sized samples; the Vickers indenter is used to load the sample, and the Vickers indenter can be used to load the sample. Hardness test can realize near non-destructive test without affecting the overall appearance of the product; using Vickers hardness tester for indentation test can precisely control the load size, loading speed, and load holding time, which are less affected by the test conditions. Repeat well; finally, this scheme can be tested directly with a standard micro-microhardness Vickers hardness tester, which is easy and quick to operate, does not need to use special instruments, is economical and practical, and has good versatility.

A diamond polycrystal having such a property that, in a Vickers hardness test carried out under conditions prescribed in JIS Z 2244:2009, the value of the ratio of d' to d, i.e., (d' / d), is 0.98 or less, wherein d represents the length of a diagonal line in a first Vickers flaw which is formed on the surface of the diamond polycrystal when a Vickers indenter is pressed at a test load of 4.9 N against the surface of the diamond polycrystal, and d' represents the length of a diagonal line in a second Vickers flaw which remains on the surface of the diamond polycrystal after the release of the test load from the diamond polycrystal.

A portable microscopic structure observation and Vickers hardness test all-in-one machine is provided with a base, and the base is provided with a fixing knob, a power source wire and a switch. The center of the base is perpendicularly and upwards provided with a lifting screw column, a screw column lifter and a center column in a matched mode; the screw column lifter is provided with a lead screw handle; the upper portion of the lifting screw column is provided with a rotary disc, a transverse translation table and a longitudinal translation disc; the longitudinal translation disc is provided with a sample carrying platform, three-jaw clamp pliers, four-jaw clamp pliers and butt clamp pliers; the upper portion of the lifting screw column is perpendicularly provided with the center column, and the upper portion of the center column is sequentially provided with a flattening disc and an objective lens pressure head convertor; the top of the objective lens pressure head convertor is provided with an eyepiece and a measurer. The portable microscopic structure observation and Vickers hardness test all-in-one machine is compact in structure, novel in style, easy and convenient to operate and convenient to carry, has the wide magnification times and test force range, is provided with multiple test sample special fixtures, can meet the detection requirements of different materials and complex-shaped test samples and can easily process and storage observation images and measured data.

An elastic deformation rate of a photoconductor, an additive amount of inorganic fine particles, and a rotary member are set to satisfy a relation of 0.6≤(D / (A×B / C)) / (1+E / 20)≤0.82, where A is a thickness of fibers of a brush, B is a bristle density of the fibers of the brush, C is a length of the fibers of the brush, D is an elastic deformation rate obtained from a hardness test conducted using a Vickers diamond pyramid indenter at a temperature of 23° C. and a humidity of 50%, and E is the additive amount of the inorganic fine particles relative to 100 parts by mass of toner particles.

A testing machine includes a stand and a test device. The stand includes a base, box frame, a slide device driven to slide by a motor, and a control system controls the force applied on the test specimen. The test device is coupled at the slide device for performing various hardness tests consisting of Rockwell hardness test, Vickers hardness test, Brinell hardness test, micro-hardness test, and tension-compression test. The test device includes a force sensor and a data processing circuit converting an analog signal of the force sensor into digital data to interface with the control system.

The invention discloses a beige tooth microcrystalline glass compounded by frits of wollastonite and apatite. The beige tooth microcrystalline glass is prepared through a sintering method after smashing and mixing white microcrystalline glass frits in a single wollastonite crystalline phase and beige microcrystalline glass frits in a single apatite crystalline phase, the bending strength of the prepared material is less than or equal to 80 Mpa, the Vickers hardness tested by an FM-700 type microhardness tester is less than or equal to 5.80 GPa (HV 0.5). According to the invention, through the adjustment of frit composition proportion and the mixing ratio of the two types of frits, microcrystalline glass similar to teeth of different crowds in color can be prepared; under the premise that the constituent ratio in a unitary system is not needed to be adjusted, the mechanical property and the color of the microcrystalline glass can be adjusted through changing the mixing ratio of the mixing frits,; the preparation technology requirements are low; industrialized popularization and application are facilitated.

The invention provides a Vickers hardness test system, which is run on a computer, and the computer is connected with a hardness test platform. The hardness test platform utilizes an industrial optical lens and a charge-coupled device to acquire the indentation image of the surface of material to be tested, and transmits the indentation image to the computer. The computer utilizes the Vickers hardness detection system to carry out analysis in order to obtain the positions of the four corners of two indentation diagonals in the indentation image, the lengths of the two indentation diagonals are calculated according to the four corners, the Vickers hardness of the material to be tested is then calculated according to the lengths of the two indentation diagonals, and a test result is outputted to a display device connected with the computer. The invention also provides a Vickers hardness test method. The invention can accurately determine the position of the indentation of the surface ofmaterial, and therefore the precision of hardness test is increased.

A punching method includes: punching out a plurality of electrical steel sheets in a stacked state by a mold, wherein sheet thicknesses of the electrical steel sheets are set to be 0.35 mm or less, a Vickers hardness (test force 1 kg) of the sheets is set to be 150 to 400, and an average crystal grain size of the sheets is set to be 50 to 250 μm, a clearance of the mold is set to be 7% or more of a minimum sheet thickness of the sheet thicknesses of the electrical steel sheets and equal to or lower than 7% of a total sheet thickness of the electrical steel sheets, and a pressure that a sheet presser of the mold applies to the electrical steel sheets is set to be 0.10 MPa or more.

A steel sheet for coal / ore carrier holds that is a ferrite-pearlite steel sheet of specified components, wherein: the microstructure is a structure configured with the ferrite area fraction in the ¼ thickness region being 80-95% and the pearlite area fraction at the ¼ thickness region being 5-20%, the average aspect ratio of the ferrite grains in the ¼ thickness region being 1.0-1.5, the average grain size of the ferrite grains in the ¼ thickness region being 5-20 µm, and the average dislocation density in the ferrite in the ¼ thickness region being 7×1012 / m2 or less; in a 1 mm pitch Vickers hardness test, the average Vickers hardness from the steel sheet surface to the ¼ thickness region or from the ¾ thickness region to the back surface is 80-105% of the average Vickers hardness from the ¼ thickness region to the ¾ thickness region; and the maximum Sn concentration in the ½ thickness (sheet thickness) ± 10% range in the sheet thickness direction is 0.01-5.0%.

The invention relates to a fitting for connecting to at least one pipe, in particular a plastic pipe or plastic-metal composite pipe, comprising a main body (4), at least one support body (6) connected to the main body (4) and for introducing into a pipe end, and at least one press sleeve (8) connected to the main body (4) and for receiving the pipe end, wherein the press sleeve (8) has a cylindrical press section (10). The technical problem of improving the fitting for pressing, in particular with small motor-driven or hand-operated pressing tools, is achieved in that the press sleeve (8) isproduced from a metal with a micro-hardness of less than 65HV1, in particular less than 50HV1, preferably in the range between 40 and 50HV1, measured according to Vickers hardness test, and in that the ratio of the wall thickness (s) of the press section (10) to the outer diameter (d) of the press section (10) is less than 0.06, preferably in the range between 0.03 and 0.06. The invention also relates to a method for producing a connection.

A structure (10) for aircrafts, includes a part (20) including a metal leading edge (30), the leading edge (30) being covered by a coating (40) having a thickness which is less than or equal to ten micrometers and having a hardness higher than six hundred in the Vickers hardness test (HV). According to a mode of embodiment, the coating (40) is a multilayer stainless steel coating consisting of a superposition of layers with a low nitrogen gradient and layers with a high nitrogen gradient, the layers having a thickness essentially equal to a micrometer. An aircraft including such a structure is also described.