133 results about "Scratch test" patented technology

The invention relates to a micron-nano scale in-situ nano indentation and scratching test system which integrates driving, precise loading and signal detection, micron-nano scale mechanics performance testing, ultraprecise scratching processing and high resolution in-situ observing as one. The system is mainly composed of a precise positioning platform at X-axis and Y-axis directions, a precise linear positioning platform at Z-axis direction, a precise indentation driving unit, a load signal and displacement signal detection unit and a high resolution digital microscopic imaging system for observing and storing material deformation and damage conditions in the test process. The precise positioning platform at the X-axis and Y-axis directions is assembled on a base, the precise linear positioning platform at the Z-axis direction is assembled on a side plate, the precise indentation driving unit, a precise mechanical sensor for detecting the indentation material pressure of a diamond tool head and a precise displacement sensor for detecting the indentation depth of the diamond tool head to along the Z-axis direction are assembled on the precise linear positioning platform at the Z-axis direction, and the high resolution digital microscopic imaging system is assembled on a beam.

PCT No. PCT/JP95/01241 Sec. 371 Date Dec. 20, 1996 Sec. 102(e) Date Dec. 20, 1996 PCT Filed Jun. 21, 1995 PCT Pub. No. WO95/35194 PCT Pub. Date Dec. 28, 1995The purpose of the invention is to produce a shaped article having a uniform dull surface with less noticeable weld line and other surface detects. The injection molded synthetic resin article of the invention has a weld portion and is characterized in that the weld line on the surface of the injection molded article has a dent of no more than 2 mu m, the surface of the injection molded article is a dull surface with no more than 30% gloss, the general portion, the weld portion and the resin flow end portion of the surface of the injection molded article provide a uniform dull surface, said dull surface having such abrasion resistance that no visible flaws develops at a hardness of 2B and below in a pencil scratch test. Such molded article can be produced without post-molding paint application and yet it has practical utility, thus presenting a maximum economic advantage.

The invention involves an apparatus and method for calculating characteristics of materials, such as equivalent strain, using an indenter where the method used is independent of indenter geometry. The method includes performing a scratch test to calculate the strain for each of a plurality of indenter shapes, such as a theoretical sphere and cone, using known equations. The strain of a composite indenter, such as a cone with a rounded tip, can then be determined taking into account contributions from each of the plurality of theoretical shapes.

The invention relates to an in-situ micro-nano indentation/scratch test platform and a test method, and belongs to the field of electromechanical integrated precision scientific instruments. An X axis precision scratch unit and a Y axis large-stroke stick-slip drive scratch assembly are assembled at the tail of a base, a Z axis macro-movement adjusting mechanism is assembled at the middle of the base, a motor driving unit is assembled at the head of the base, a precision pressing driving and displacement signal detecting unit is installed on the Z axis macro-movement adjusting mechanism, and a precision three-axis force sensor used for detecting an indentation pressing force and a normal force and a tangential force of a scratch is installed on the X axis precision scratch unit. The in-situ micro-nano indentation/scratch test platform has the advantages of compact structure, miniaturization, integration, and capability of better ensuring the assembly precision, effectively improving the overall rigidity and dynamic properties and improving the overall test precision while overcoming the defect that an existing test platform cannot be used for quantitatively detecting the normal force and the tangential force in a scratch process.

A cleaning device includes a cleaning member, a collection member, an electrical field generator, and a separation member. The cleaning member has a surface capable of moving while contacting a surface of a cleaning target to remove toner on the surface of the cleaning target. The collection member has a surface capable of moving while contacting the surface of the cleaning member to collect the toner on the surface of the cleaning member. The electrical field generator generates an electrical field to move the toner from the cleaning member to the collection member. The separation member contacts the surface of the collection member to separate the toner on the surface of the collection member. The collection member has a centerline average surface roughness of not more than 0.1 μm and shows a surface hardness rank of B or higher in a steel-wool scratch test.

A scratch testing apparatus for performing a scratching test while gradually increasing or decreasing a load, in which a pressure applied to the surface of a test specimen gradually increases or decreases as a head unit, to which a tip is attached, moves horizontally. The scratching testing apparatus includes a head unit having a bottom to which a tip attached; a guiding unit for guiding the head unit to move horizontally; and a pressure changing unit for changing pressure applied to the tip while the head unit is moving along the guiding unit. Therefore, the scratch testing apparatus may perform a scratching test as gradually increasing or gradually decreasing a load applied to the test specimen by the tip by moving the head unit, to which the tip is attached, horizontally.

The invention provides a rock brittleness evaluation method based on a stress strain curve and a scratch test. The method comprises the following steps that: evaluating rock from a crustal stress environment where the rock is positioned, and pore pressure, and obtaining the stratum condition of the rock; selecting a rock mechanical experiment of the environment where a rock sample to be tested ispositioned, wherein the experiment includes a conventional triaxial compression test or a triaxial compression test which considers pore pressure, and a scratch test; obtaining a pre-peak strain energy density value, a crack initiation stress value, a peak value stress value, a residual stress value as well as corresponding strain size and crack linear density; and determining the value range of an effective stress coefficient [Alpha] from the pore pressure of a tested rock sample, and substituting the pre-peak strain energy density value, the crack initiation stress value, the peak value stress value, the residual stress value as well as the corresponding strain size and crack linear density into a brittleness index calculation formula to obtain the brittleness index of the rock to be tested. By use of the brittleness evaluation method, the accuracy and the applicability of the rock brittleness evaluation can be improved.

The invention relates to a new art applied in the chemical plating preprocess of ABS plastic body. With the biomacromolecule-chitosan (CTS) or the film forming performance of chitosan derivative and the chitosan-sorption to the target, the invention reduces and obtains the active site(Pd0) which can catalyze the chemical nickel plating at the body surface with chemical method; thus, the chemical sorption replaces the traditional physical sorption which is applied in the activation and sensitization of Pd/Sn colloid of chemical nickel plating preprocess of n-conducting body surface. The stabilization of the art is strengthened, the cost is reduced and the chrome and tin pollution to the environment in the traditional art are avoided; particularly, the chemical sorption replacing the physical sorption can increase the bonding force of the plating layer and body. The plating layer is evenly dense after the SEM detecting the shape of plating layer. And the heat vibration test and the scratch test show that the bonding force of the plating layer is great.

The invention discloses a device for testing the nano scratch and friction stick-slip properties of film surfaces. The device comprises a base, wherein the base is provided with a piezoelectric motion platform for holding test samples and a displacement platform capable of moving vertically and horizontally, the displacement platform is provided with a sensor holder, the front end of the sensor holder is fixedly provided with a nano scratch and stick-slip testing sensor, the scratching head of the nano scratch and stick-slip testing sensor is located right above the piezoelectric motion platform, and the base is also provided with an optical imaging system. According to the device disclosed by the invention, the motion platform and the sensor are organically combined, through different motion control modes, on the one hand, a nano scratch test on films can be completed, and therefore the defects that an AFM (Atomic Force Microscope) nano scratch device is limited in a loading range and difficult to control, and has high requirements on the surface roughness of samples are overcome; and on the other hand, the online test on the friction stick-slip properties of film surfaces can also be completed, therefore, the defect that a high-stiffness friction tester can not reflect the friction stick-slip properties of surfaces is overcome.

The invention relates to a test method for evaluating the initial wear resistance of austenite high manganese steel under a high impact load. The test method comprises the following steps of: (1) performing a simple pendulum impact scratch test by using a simple pendulum scratch testing machine; (2) calculating energy E consumed in a scratch forming process; (3) calculating the volume V of a sample surface scratch; and (4) calculating specific dissipating energy e according to a formula e=E/V and judging the level of the initial wear resistance of the austenite high manganese steel under the high impact load according to the magnitude of the specific dissipating energy e under the same test parameter condition. The simple pendulum impact scratch test has a function of simulating the micro-plowing and micro-cutting of abrasive wear, and has the impact energy loading characteristic when a single abrasive particle scratches a material surface with a certain impact force and the working condition is similar to that of the austenite high manganese steel under the high impact load, so the specific dissipating energy e obtained under the simple pendulum impact scratch test can represent the initial wear resistance of the material under the high impact load.

The invention provides a coating service life prediction method based on a stress and bonding strength evolvement mechanism and relates to a coating service life prediction method. The coating service life prediction method aims at solving the problem a comprehensive and objective coating service life prediction method is not disclosed at present. The coating service life prediction method comprises the steps that firstly, residual stress-time change relation and oxidation layer stress-time change relation are established, and a coating stress evolutionary physical model is established; secondly, a thermal-cycle sample aging acceleration test is performed, and the acceleration times of artificially accelerating sample aging are obtained according to the coating stress evolutionary physical model and sample stress value-time relation; thirdly, a scratch test instrument is adopted to test the bonding strength of the sample artificially accelerated in aging, the bonding strength-ageing time relation is fit and is drawn into a changing curve, the time corresponding to the intersection point of the changing curve and a timeline serves as the service life 1 of the sample artificially accelerated in aging, and L is equal to sample service life 1* final acceleration times k and serves as the predicted service life. The coating service life prediction method is applicable to the field of coating service life prediction.

The invention relates totalcum powder and preparation method thereof, in particular to special scratch-resistant talcum powder for polypropylene and a preparation method thereof. The talcum powder comprises the following components in parts by weight: 0.1-0.5 part of titanate coupling agent, 0.1-0.5 part of silane coupling agent, 97-99 parts of superfine talcum powder and 0.1-0.5 part of high molecular weight siloxane copolymer. The invention has the following advantages and effects: the activation rate of the talcum powder provided by the invention is more than 99.0%, the oil adsorption value is less than 1.5mL/100g, the product purity is high and the particle size is 1-50mu m. Through the inspections of the professional inspection institution, the scratch resistance of the polypropylene car bumper special material prepared from the talcum powder which is provided the invention satisfies the grade A of the multi-finger scratch test and the Delta L in the Erichsen cross test is less than 1.5.

The invention provides a method for non-precious metal Pd-free plastic matrix surface activation using sodium carboxymethyl cellulose to chelae and absorb nickel, which comprises the processing steps of pretreatment of the surface of the plastic matrix to be plated, preparation of an activating and film forming liquid, treatment of activation and film forming, treatment of reduction, and chemical nickel plating; and a metal organic complex solution consisting of divalent ion water soluble salt containing nickel uses a strong reducing agent to directly reduce the active metal-nickel and deposit on the matrix, then the chemical nickel plating is carried out. The result of the configuration of a nickel plating layer by a scanning electron microscope and a metaloscope shows that the plating layer is combined compactly, and particles are evenly distributed; and scratch tests show that the bonding force of the plating layer is good. The method has simple process, convenient operation, wide sources and low price of sodium carboxymethyl cellulose used, low cost and reduced precious metal pollution due to replacement of expensive Pd by nickel, can be suitable for most of plastics due to low activation temperature, and has high practical value and application prospect.

The invention provides a method for controlling the growth of graphene nanocrystalline carbon film by adjusting the irradiation density of ECR ions. According to the method, an ECR plasma sputtering system is utilized, the current of a third magnetic coil is adjusted to be changed within the range of 0-48A, argon ions are restrained by adopting a transition magnetic field mode, and a certain working pressure and microwave power are combined, so that the ion irradiation density in the preparation process of the carbon film is further changed. Nano-indentation and nano-scratching tests are carried out on the carbon films prepared under different ion irradiation densities, and when the current of the third magnetic coil varied from 0 A to 48 A, the ion irradiation density can vary from 1.88 mA/cm<2> to 26.89 mA/cm<2>, therefore, the graphene nanocystalline carbon film influenced by the ion irradiation densities within the range has the average size of the graphene nanocystalline from 0.66nm to 1.19 nm, the hardness from 6.45 GPa to 14.53 GPa, the elastic modulus from 116.30 GPa to 179.28 GPa, the friction coefficient from 0.07 to 0.38, and the scratch depth from 2.78 nm to 6.36 nm, and and has better mechanical and tribological properties.

The invention discloses a PMMA/ASA alloy material with high heat resistance and high black brightness and a preparation method and application thereof. The PMMA/ASA alloy material is prepared from thefollowing components in parts by weight: polymethyl methacrylate (PMMA) resin, acrylonitrile-styrene-acrylate copolymer (ASA rubber powder), a heat-resisting agent, an antioxidant, a light stabilizer, an anti-scraping agent and a coloring agent. According to the PMMA/ASA alloy material prepared through the method, HDT can reach 95 DEG C or above and is improved by 20 DEG C or above compared withmature materials on the market, the surface gloss is basically not reduced, the blackness L value is 22.5, and the effect of piano black can be achieved. Meanwhile, the scratch resistance is also obviously improved, and a five-finger scratch test and a surface wear resistance test can be passed.

The invention discloses a scratch-resistant polyamide composition and a preparation method thereof. The scratch-resistant polyamide composition is prepared from the following raw materials in percentage by mass: 40-80% of a polyamide resin, 10-40% of a glass fiber, 0.5-4% of organo-siloxane, 0.3-1.5% of polytetrafluoroethylene, 5-15% of a polyethylene-crylic acid ionomer, 0.2-1.0% of an antioxidant and 0.1-1.0% of a lubricant. The invention further discloses a preparation method of the scratch-resistant polyamide composition. The scratch-resistant polyamide composition disclosed by the invention is good in scraping resistance, mechanical property and coloring property, no conspicuous scratch marks are caused in five-finger scratch tests, and components and elements made of the composition are not easily scratched in long-term use.

The invention provides a method and a device of full-domain cutting force model in rotary ultrasonic vibration milling. By carrying out the kinematics analysis between a tool abrasive grain and a workpiece material interaction in the machining process, a technology parameter matching relation meeting the vibration separation of a cutting area is obtained, and a condition equation of an intermittent cutting characteristic is established; and according to an ultrasonic vibration auxiliary scratch test, critical press-in depth of ductility or brittleness removal mode changing of a material is obtained, the abrasive particle press-in depth distribution relation of the cutting area is established, the abrasive grain loads of different positions of the cutting area are accumulated, and ductilityor brittleness cutting force model is obtained correspondingly, the models are fused according to the critical press-in depth and the maximum cutting thickness, and the rotary ultrasonic vibration machining whole-domain cutting force model is obtained. According to the device, the rotary ultrasonic vibration machining characteristic and a removing mechanism can be more comprehensively reflected,so that the cutting force prediction and the technology optimization of the actual machining can be effectively guided.

Disclosed herein is a method for evaluating scratch resistance of a plastic resin comprising scratching a surface of a test sample of plastic resin using a scratch apparatus to form a scratch of the surface having a scratch profile; scanning the scratched test sample with a surface profile analysis apparatus to measure the scratch profile; and creating a scratch resistance evaluation index based on the measured scratch profile to evaluate the scratch resistance of the test sample. The method has good reliability and reproducibility, reduces measurement time and errors caused by measurers and measuring conditions, provides easy measurement and can be widely applied to all plastic resins.

The invention relates to a suspended rotary rapid positioning in-situ indentation/deepened arc indentation testing device and belongs to the field of mechanical and electronic integrated precise instruments. The device comprises a suspended rotary rapid positioning module, a deepened arc indentation testing module, a micro-nano indentation module and an in-situ observation module, wherein the micro-nano indentation module and the in-situ observation module are integrated on the suspended rotary rapid positioning module; the deepened arc indentation testing module is composed of an indentation tester and a test piece supporting platform together; and the test piece supporting platform is composed of two parts, namely a shear-type electric lifting table and an electric rotating platform. The device disclosed by the invention has the advantages that the device is novel in structure, has motor-driven rapid feed ability and micro-nano-level piezoelectric micro actuating ability, and can be used for accurately testing the hardness, elasticity modulus, scratching resistance and other mechanical property performances of the test materials. The loading displacement resolution reaches a micro-nano level, and the loading force resolution reaches a micro-Newton level. The effective test means is provided for mechanical behaviors and service behaviors of the materials.

The invention discloses a preparation method of a CrAlN coating based on a HIPIMS technology. The high-power pulse magnetron sputtering technology (High Power Impulse Magnetron Sputtering, HIPIMS) is adopted, a method for co-sputtering by using a high-power pulse target (High pulse power cathode) and a bipolar pulse target (Bipolar pulsed sputtering cathodes) is used, and a (H+B) CrAlN coating is deposited; and meanwhile, an ARC CrAlN coating is deposited by adopting a fourth-generation arc ion plating technology (ARC evaporators). The performance of all aspects of the coating is analyzed through a scratch test, an X-ray diffraction, a microscopic morphology observation, an electrochemical corrosion test and the like, and the binding force of a (H+B) CrAlN coating film is stronger, and the maximum critical load can reach 62.4N; the surface crystal grains are smaller, the defects are few, and the section tissues are compact; meanwhile the high-temperature oxidation resistance of the CrAlN coating prepared by the (H+B) method is optimal; and the coating prepared by co-sputtering in the aspect of coating corrosion resistance is more corrosion-resistant than the coating prepared by electric arc ion plating.