CN102393341B - Indentation method for testing hardness, fracture toughness and residual stress of brittle material - Google Patents
Indentation method for testing hardness, fracture toughness and residual stress of brittle material Download PDFInfo
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Abstract
The invention discloses a method for testing the hardness, fracture toughness and residual stress of a brittle material with an indentation method, belonging to the technical field of material property representation, and the method is applied to the device. The device comprises a frame and an image acquiring system, wherein the frame is provided with an eye lens, a height-adjustable testing operation platform and an adjusting rotating wheel; a loading system is arranged in the frame, and comprises a fixing support base, a lever, a mandrel, a hanging rod, a middle main shaft and a second motor; and a first motor and the second motor of the loading system are connected with a computer through an I/O (Input/Output) control card. In the invention, the conventional digital image low-load Vickers hardness meter is improved, so that the micro-hardness of a material can be directly tested, and the fracture toughness and residual stress of an interface system of the brittle material and a brittle coating film material can be directly tested; and the device can be widely applied to departments such as industrial enterprises, universities, academies and the like for rapidly detecting relevant indexes.
Description
Technical field
The invention belongs to material property characterization technique field, particularly a kind of method of hardness of indentation method testing brittle material, fracture toughness and unrelieved stress.What be specifically related to is through existing digital picture Smaller load Vickers upgrading, can not only the microhardness of direct test material, and can the directly fracture toughness of testing brittle material and brittle coating membraneous material interface system and unrelieved stress.
Background technology
In new material technology field, brittle coating membraneous material has power not available for many base materials, heat, optical, electrical, magnetic and chemical property, the fields such as microelectronic component, magnetic store, surface coating and compound substance are widely used in, in national economy, play irreplaceable vital role, create huge economic benefit.But; owing to there is larger difference in material properties between coating and substrate; extraneous factor (as temperature variation, fatigue load, high-temperature oxydation, corrosive medium etc.) can affect bonding properties and the intensity of coating and substrate gradually in the application simultaneously; finally cause the pull out type fracture of coating generation unpredictability and lose defencive function, major accident even may be caused to occur.Therefore, improving coating material interfacial combined function is one of important method improving advanced coating material reliability.Wherein, how the microhardness of Validity Test and characterizing coating material system, surface/interface fracture toughness and unrelieved stress have become key scientific problems in the urgent need to address in this work.
The experimental test procedures and the device that relate to above-mentioned three material parameters at present have:
In testing material hardness, the bright hardness proposing a kind of sclerometer test material of such as Wu Shao, mainly comprises: supporting frame; Cavity and coaxial pilot hole (ZL 200420096539.3) is had in supporting frame.The people such as Wu Jihua propose a kind of hardness detection method, the test block of different hardness is first used to carry out demarcation and the drafting of sclerometer working curve (depth of cup-hardness number curve) by VB software program during detection, and then workpiece for measurement is detected, by substituting into sclerometer working curve by detecting the depth of cup angle value obtained, thus obtain the hardness number (CN 101893534A) of workpiece for measurement.
In material fracture toughness, the people such as Chen Changqing report a kind of fracture toughness measurement method based on optics, by measuring the Young modulus E of test specimen, thickness direction Poisson ratio v
z, Poisson ratio v in face
xywith specimen thickness B, with the filming apparatus of optics strain gauge, crack tip near zone is taken pictures, fatigue crack prefabrication and loading are carried out to test specimen, until test specimen fracture stops, then carry out numerical operation, draw J surface; Obtain the K reflecting brittle fracture further
iCor obtain ductile fracture toughness value, but need to take pictures (CN 101644646A) continuously to crackle.The people such as distribution spring report a kind of method-monolateral angular cut beam method of evaluating ceramic materials fracture toughness.Adopt 3 × 4 × 36 or 3 × 4 × 45mm
3bar samples as test sample, after surface finish, utilize the prefabricated angular cut of the method for machining, the width control system of otch below 300 microns, then by the fracture toughness of four-point bending experimental technique test stupalith.But this method needs precrack artificially, easily bring the impact (CN 101210866A) of human factor.Wu Lihang reports a kind of material fracture toughness test sample without precrack, by ganoid detected materials sample body and be compounded in one deck its mechanical performance parameter known on its smooth surface, there is higher elasticity modulus, the fragility thin layer that first can ftracture in loading procedure forms.But must by 502 adhesive bond measured materials and fragility thin layer, the performance of 502 tackifier and bonding gimmick may on test result impact comparatively large (CN201196613Y).
In residual stress test, major part researchist mainly considers the unrelieved stress in non-destructive testing or microlesion test material, such as, by means of XRD method (CN 101451965A), impact indentation method (CN1091825A), optical holographic interferometry technology (CN 1415066A) etc.These method of testing specialties require high, and instrument and equipment cost is high, and some test process is loaded down with trivial details, are unfavorable for factory, business enterprise expand application.
In sum, lack at present a kind of scientific approach of high-efficient simple and most advanced and sophisticated scientific instrument test above-mentioned three material parameters simultaneously, this also strongly limit quality assurance and the reliability of coating product.Main practical situation and cause is: existing detecting instrument function singleness or deficient function, needs the critical material index such as microhardness, fracture toughness, unrelieved stress that just may record coating material through multiple stage experimental apparatus.And Instrument purchase cost is high, maintenance cost and testing expense are also very high, the more important thing is test process very complicated, require higher specialty background and analysis ability, be unfavorable for factory, business enterprise expand application, the scientific instruments equipment therefore needing the more superior method of testing of development and coupling badly solves this key technical problem.
Summary of the invention
The object of the invention is through the upgrading to existing digital picture Smaller load Vickers, research and develop into a multifunctional all Smaller load Vickers indentation instrument.The microhardness of this instrument not only direct test material, and can the directly fracture toughness of testing brittle material and brittle coating membraneous material interface system and unrelieved stress.
The invention provides the device of a kind of hardness of indentation method testing brittle material, fracture toughness and unrelieved stress, it is characterized in that, this device comprises frame, it arranged eyepiece, liftable test operation platform and regulate runner, loading system is provided with in frame, described loading system comprises the first hold-down support, lever, push rod, suspension rod, intermediate spindle and the second motor, wherein
First hold-down support of described loading system is connected with the second hold-down support in frame, for one end of truck dead lever, the lever other end arranges suspension rod, described suspension rod is made up of multiple counterweight, intermediate spindle is connected in the below of one end of the first hold-down support near lever, lever, intermediate spindle is connected with the Vickers pressing be arranged on rotating disk through the perforate be positioned at above rotating disk, rotating disk is located at above liftable test operation platform, rotating disk is also provided with object lens, rotating disk is connected with the first motor, first motor is arranged in frame, for controlling the rotation of rotating disk; Lever is supported by push rod, and push rod is connected with the second motor, and push rod is all connected with frame with the second motor; To move up and down with the weight of counterweight by load applying to being positioned at the intermediate spindle be connected on lever by push rod, this intermediate spindle is through the hole be positioned at above rotating disk and power is applied to Vickers pressing, for carrying out impression test to sample;
Arrange supporting plate under suspension rod, supporting plate is connected with the adjustment runner in frame, is taken turns regulating indentation load size by regulating rotary;
Described device also comprises image capturing system; Described image capturing system is CCD video acquisition instrument;
First motor of described loading system is connected with computing machine through I/O control card with the second motor, and described image capturing system is connected with computing machine through image pick-up card.
Indentation load grade loading in scope from 1.0Kgf to 29.0Kgf of described loading system.
Load to realize grade pitch, by regulating the quantity, the size that load counterweight, and the length of lever realizes, intermediate spindle is 5cm to the distance of the first hold-down support of lever, intermediate spindle to lever hangs suspension rod counterweight hook between distance be 28cm, loading system adjacent load grade pitch is 2.0Kgf, as suspension rod counterweight add up to 14, the weight of each counterweight is 2.0Kgf.
Described adjustment runner is arranged on the right side of the lower end of frame, to facilitate adjustment.
Described liftable test operation platform comprises example platform and example platform lift adjustment runner, regulates lifting by example platform lift adjustment runner.Example platform can be cross platform.
Described computing machine can be connected with printer.
The present invention also provides a kind of method of hardness of indentation method testing brittle material, fracture toughness and unrelieved stress, and the method step is as follows:
(1) starter gear, inputs the elastic modulus of measured material in first corresponding in the analyzing software system of computing machine instruction frame;
(2) sample is put on liftable test operation platform, rotates example platform lift adjustment runner and make example platform slowly increase, until specimen surface clearly can be observed from eyepiece;
(3) rotating wheel, makes indentation load size in test reach the requirement of setting, and judges whether test macro connects well from the force value size that Computer aided analysis system shows;
(4) the startup button on computing machine in analyzing software system interface is clicked, Vickers pressing is then automatically rotated to the top of sample, then slowly carry out loading, protecting the program test of carrying, unloading, after impression test is complete, Vickers pressing automatic rotation is withdrawn, eyepiece can be automatically rotated to sample surface, is convenient to experimenter and carries out observation and analysis;
(5) in the analysis software interface of computing machine, utilize mouse and acquisition system to test the crack length at the cornerwise length of remaining impression, remaining impression drift angle place, and preserve;
(6) by regulating liftable test operation platform, the surface of mobile sample, second time impression test is carried out in preparation, regulate runner, increase or reduce indentation load, repeating above-mentioned 3rd step to the 5th step, complete the impression test of more than three times or three times, after requiring that each test terminates, preserve corresponding experimental data respectively;
(7) in the analyzing software system of computing machine, read the experimental data of above-mentioned preservation, then can obtain the average microhardness of tested brittle coating material, the fracture toughness at tested place and unrelieved stress.
The scheme that the present invention takes is:
1. the hardware loading system of pair existing digital picture Smaller load Vickers carries out upgrading.Loading system in major alterations sclerometer, and further perforate (hold-down support of the loading system) position loading the quantity of counterweight, size and lever is adjusted, thus the size of adjustment indentation load, make it to be positioned at 1.0Kgf to 29.0Kgf scope, and adjacent load grade pitch is 2.0Kgf, so just achieve and impression fracture test is carried out to most of hard brittle material and brittle coating thin film system, both ensured produce indentation crack in tested brittle material surface, measured material can not be caused again thoroughly to crush.Concrete scheme is:
Load to realize grade pitch, we are by changing the length of lever, intermediate spindle is 5cm to the distance of the hold-down support of lever, intermediate spindle to lever hangs suspension rod counterweight hook between distance be 28cm, as suspension rod counterweight add up to 14, the weight of each counterweight is 2.0Kgf.
2. the analyzing software system of pair existing digital picture Smaller load Vickers carries out upgrading.On existing sclerometer analysis software basis, the impression fracture mechanics model of improvement is implanted scleroscopic analysis software kernel by us, expands its analytic function.Concrete test philosophy and process as follows:
Micro-hardness testing principle.First set the size of indentation load P, gathered by acquisition system and be sent in the analysis software of research and development.After completing indentation test, acquisition system and analyzing software system is utilized to test out remaining impression two cornerwise length D
1and D
2, the microhardness of measured point is then calculated according to following formula:
The fracture toughness of hard brittle material or brittle coating film interface system and residual stress test principle.First with other experimental technique or the elastic modulus E looking into handbook determination detected materials, be input in the analyzing software system of research and development.Then select different load to complete impression fracture experiment in various degree, obtain different indentation crack length.Remaining impression two cornerwise length D are tested out equally by acquisition system and analyzing software system
1and D
2, each remaining impression drift angle place crack length C, each maximum load load p.Finally substitute into the impression fracture mechanics model that we improve, calculate the stress strength factor K that measured material is produced by indentation load and unrelieved stress in Indentation Cracking process
iC:
Wherein σ
rrepresent the unrelieved stress at measured point place, χ=0.015 (E/H)
1/2, E and H represents elastic modulus and the hardness of tested single hard brittle material respectively.If the fracture toughness of test brittle coating membraneous material Interface composites system and unrelieved stress, then need to revise with following formula:
Wherein, the subscript c in formula (3) and s represents brittle coating and base material respectively.Obtain after formula (2) conversion:
So just obtain about C
1/2and P/C
3/2linear function.By the impression fracture test under the different loads condition of hard brittle material being carried out to more than three times or three times, the crack length at magnitude of load in each experiment, the cornerwise length of remaining impression, remaining impression drift angle place will be measured and gather out to system automatically.Then by the load of each experiment test and crack length data, with (P
1/ C
1 3/2, C
1 1/2), (P
2/ C
2 3/2, C
2 1/2), (P
3/ C
3 3/2, C
3 1/2) ... (P
n/ C
n 3/2, C
n 1/2) form carries out linear fit, obtains unrelieved stress and the fracture toughness of measured point from the straight slope simulated and intercept respectively.The present invention successfully realizes automatic analysis and goes out the important material parameter of the microhardness at tested brittle material surface place, fracture toughness and unrelieved stress three.
The advantage of apparatus of the present invention is: (1), in existing digital picture Smaller load Vickers indentation instrument, this device takes the lead in 1.0Kgf to 30.0Kgf scope, realize multistage special loading technique.(2) this device directly can test the microhardness of brittle diaphragm coating material, fracture toughness and unrelieved stress under small scale, merge various test and scientific instrument in one, greatly reduce Instrument purchase cost, maintenance cost and testing expense.As far as we know, in existing digital picture Smaller load Vickers indentation instrument, there is not been reported has the instrument of this kind of function.(3) this device can characterize high bond strength, the hard brittle material of high rigidity and the mechanical property of brittle coating thin film system, the perfect deficiency of existing method of testing.(4) sample preparation is simple, without the need to artificial precrack, easy and simple to handle, analyzes quick, is convenient to apply in research and development department, quality testing mechanism and manufacturing enterprise, fast and effeciently can evaluates the q&r of brittle coating material system.
Accompanying drawing explanation
Fig. 1 is the overall schematic of apparatus of the present invention;
Fig. 2 is the part-structure schematic diagram of apparatus of the present invention;
Fig. 3 is apparatus of the present invention loading system schematic diagram;
Optical microscope home position observation picture behind Fig. 4 apparatus of the present invention test heat barrier ceramic coating example interface region;
The variation relation of Fig. 5 heat barrier ceramic coating fracture toughness test result and times of thermal cycle;
The variation relation of Fig. 6 heat barrier ceramic coating residual stress test result and times of thermal cycle;
Wherein, number in the figure: 1. loading system, 2. image capturing system, 3. image pick-up card, 4. analyzing software system, 5. liftable test operation platform, 6. computing machine, 7. printer, 8.I/O control card, 11. first hold-down supports, 12. levers, 13. push rods, 14. suspension rods, 15. counterweights, 16. supporting plates, 17. first motors, 18. second motors, 19. rotating disks, 20. intermediate spindle, 21.CCD video acquisition instrument, 22. example platforms, 23. example platform lift adjustment runners, 24. regulate runner, 25. Vickers pressings, 26. eyepieces, 27. object lens, 28. second hold-down supports, 30. frames.
Embodiment
The following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Embodiment 1
A device for the hardness of indentation method testing brittle material, fracture toughness and unrelieved stress, it is characterized in that, this device comprises frame 30, it is arranged eyepiece 26, liftable test operation platform 5 and regulates runner 24, being provided with loading system 1 in frame 30;
Described loading system 1 comprises the first hold-down support 11, lever 12, push rod 13, suspension rod 14 and the second motor 18, wherein,
First hold-down support 11 of described loading system 1 is connected with the second hold-down support 28 in frame 30, for one end of truck dead lever 12, lever 12 other end arranges suspension rod 14, described suspension rod 14 is made up of multiple counterweight 15, in one end of the first hold-down support 11 near lever 12, the below of lever 12 connects intermediate spindle 20, intermediate spindle 20 is connected with the Vickers pressing 25 be arranged on rotating disk 19 through the perforate be positioned at above rotating disk 19, rotating disk 19 is located at above liftable test operation platform 5, rotating disk 19 is also provided with object lens 27, rotating disk 19 is connected with the first motor 17, first motor 17 is arranged in frame 30, lever 12 is supported by push rod 13, and push rod 13 is connected with the second motor 18, and push rod 13 is all connected with frame 30 with the second motor 18, move up and down by push rod 13 intermediate spindle 20 being positioned at by load applying with the weight of counterweight 15 and being connected on lever 12, this intermediate spindle 20 is through the hole be positioned at above rotating disk 19 and power is applied to Vickers pressing 25, for carrying out impression test to sample,
Arrange supporting plate 16 under suspension rod 14, supporting plate 16 is connected with the adjustment runner 24 in frame 30, regulates indentation load size by adjustment runner 24;
Described device also comprises image capturing system 2; Described image capturing system 2 is CCD video acquisition instrument 21;
First motor 17 of described loading system 1 is connected with computing machine 6 through I/O control card 8 with the second motor 18, and described image capturing system 2 is connected with computing machine 6 through image pick-up card 3.
Indentation load grade loading in scope from 1.0Kgf to 29.0Kgf of described loading system 1.Loading system adjacent load grade pitch is 2.0Kgf.Intermediate spindle 20 is 5cm to the distance of the first hold-down support 11 of lever, intermediate spindle 20 to lever 12 hangs suspension rod 14 counterweight hook between distance be 28cm, loading system adjacent load grade pitch is 2.0Kgf, as suspension rod counterweight add up to 14, the weight of each counterweight is 2.0Kgf.
Described adjustment runner 24 is arranged on the right side of the lower end of frame 30, to facilitate adjustment.
Described liftable test operation platform 5 comprises example platform 22 and example platform lift adjustment runner 23, regulates lifting by example platform lift adjustment runner 23.Example platform 22 is cross platform.
Described computing machine is connected with printer 7.
Embodiment 2
Adopt the device of embodiment 1 can the microhardness of test material, simultaneously can also testing brittle material and the fracture toughness at brittle coating thin film system interface, the unrelieved stress at measured position place, the step of specific embodiment is as follows:
The first step, prepares sample.Adopt plasma spray coating process, high temperature nickel alloy substrate sprays thermal barrier coating ceramic material.The coat system composition of sample is: buffer layer material is NiCrAIY alloy, and its thickness is about 150 μm; Ceramic powder material is for containing 8wt%Y
2o
3-ZrO
2, the ceramic layer thickness of spraying is about 350 μm.In order to consider the impact of high-temperature oxydation on thermal barrier coating system interfacial combined function, then at 1100 DEG C, high-temperature heat treatment is carried out to part primary sample.Then meticulous metallographic process is carried out to sample, comprise corase grind, fine grinding, polishing, removal work hardening, Ultrasonic Cleaning supervisor, make tested sample surface as far as possible smooth, there is no cut, reach test request.
Second step, starts apparatus of the present invention, inputs the elastic modulus of measured material in first corresponding in the analyzing software system 4 of computing machine instruction frame.
3rd step, sample is put on example platform 22, rotates example platform lift adjustment runner 23 and make example platform 22 slowly increase, until specimen surface clearly can be observed from eyepiece 26, show the focal position place just in time adjusting to object lens, impression test below can be carried out.
4th step, rotates and regulates runner 24, make indentation load size in test reach the requirement of setting, and judges whether test macro connects well from the force value size that analyzing software system 4 computing machine 6 shows.
5th step, click the startup button in analyzing software system 4 interface on computing machine 6, Vickers pressing 25 is automatically rotated to the top of sample, then slowly carries out loading, protecting the program test of carrying, unloading.After impression test is complete, Vickers pressing automatic rotation is withdrawn, and eyepiece 26 can be automatically rotated to sample surface, is convenient to experimenter and carries out observation and analysis.
6th step, in the analysis software interface of computing machine, mouse and acquisition system is utilized to test the crack length at the cornerwise length of remaining impression, remaining impression drift angle place, and click " preservation " this indentation load size, the cornerwise length of remaining impression, remaining impression drift angle place the experimental data of crack length, suppose that temporary designations is testdata1.
7th step, by regulating example platform 22, the surface of mobile sample, then prepares to carry out second time impression test.Regulate runner 24, increase or reduce indentation load, repeating above-mentioned 3rd step to the 6th step, complete the impression test of more than three times or three times.After requiring that each test terminates, preserve corresponding experimental data respectively, mainly comprise the crack length at the indentation load size of each test, the cornerwise length of remaining impression, remaining impression drift angle place, suppose that the experimental data files name temporary designations preserved is testdata2, testdata3 etc.
8th step, in the analyzing software system of computing machine, read the experimental data base testdata1 of above-mentioned preservation, testdata2, testdata3 etc., click " overall treatment " button in analyzing software system 4, then can obtain the average microhardness of tested brittle coating material, the fracture toughness at tested place and unrelieved stress.
Fig. 4, Fig. 5 and Fig. 6 are some representational test results, and sample is the thermal barrier coating sample after experience elevated temperature thermal cycles.Application apparatus of the present invention have successfully been obtained ceramic coating system fracture toughness and unrelieved stress, and analyze these two parameters with times of thermal cycle change and change relation.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (2)
1. a method for the hardness of indentation method testing brittle material, fracture toughness and unrelieved stress, is applied on the device of a kind of hardness of indentation method testing brittle material, fracture toughness and unrelieved stress;
Wherein, described device comprises frame (30), it is arranged eyepiece (26), liftable test operation platform (5) and adjustment runner (24), loading system (1) is provided with in frame (30), described loading system (1) comprises the first hold-down support (11), lever (12), push rod (13), suspension rod (14), intermediate spindle (20) and the second motor (18), wherein, first hold-down support (11) of described loading system (1) is connected with the second hold-down support (28) in frame (30), for one end of truck dead lever (12), lever (12) other end arranges suspension rod (14), described suspension rod (14) is made up of multiple counterweight (15), in one end of the first hold-down support (11) near lever (12), the below of lever (12) connects intermediate spindle (20), intermediate spindle (20) is connected with the Vickers pressing (25) be arranged on rotating disk (19) through the perforate being positioned at rotating disk (19) top, liftable test operation platform (5) top is located at by rotating disk (19), rotating disk (19) is also provided with object lens (27), rotating disk (19) is connected with the first motor (17), first motor (17) is arranged in frame (30), lever (12) is supported by push rod (13), and push rod (13) is connected with the second motor (18), and push rod (13) is all connected with frame (30) with the second motor (18), arrange supporting plate (16) under suspension rod (14), supporting plate (16) is connected with the adjustment runner (24) in frame (30), described device also comprises image capturing system (2), and described image capturing system (2) is CCD video acquisition instrument (21), described loading system (1) indentation load is grade loading in scope from 1.0Kgf to 29.0Kgf, and described loading system adjacent load grade pitch is 2.0Kgf, intermediate spindle (20) is 5cm to the distance of first hold-down support (11) of lever, intermediate spindle (20) to lever (12) hangs suspension rod (14) counterweight hook between distance be 28cm, as suspension rod counterweight add up to 14, the weight of each counterweight is 2.0Kgf, first motor (17) of described loading system (1) is connected with computing machine (6) through I/O control card (8) with the second motor (18), and described image capturing system (2) is connected with computing machine (6) through image pick-up card (3), described adjustment runner (24) is arranged on the right side of the lower end of frame (30), to facilitate adjustment, described liftable test operation platform (5) comprises example platform (22) and example platform lift adjustment runner (23), regulate lifting by example platform lift adjustment runner (23), described example platform (22) is cross platform, described computing machine is connected with printer (7),
It is characterized in that, the method comprises the steps:
(1), prepare sample, adopt plasma spray coating process, high temperature nickel alloy substrate sprays thermal barrier coating ceramic material, the coat system composition of sample is: buffer layer material is NiCrAIY alloy, and its thickness is 150 μm; Ceramic powder material is for containing 8wt%Y
2o
3-ZrO
2, the ceramic layer thickness of spraying is 350 μm, then carries out high-temperature heat treatment to aliquot at 1100 DEG C, then carries out meticulous metallographic process to sample, makes specimen surface as far as possible smooth, does not have cut, reach test request;
(2), starter gear, input the elastic modulus of measured material in first corresponding in the analyzing software system (4) of computing machine instruction frame;
(3), sample is put on example platform (22), rotating example platform lift adjustment runner (23) makes example platform (22) slowly rise, until can observe specimen surface clearly from eyepiece (26);
(4), adjustment runner (24) is rotated, make indentation load size in test reach the requirement of setting, and judge whether test macro connects well from the force value size of analyzing software system (4) display computing machine (6);
(5) the startup button in upper analyzing software system (4) interface of computing machine (6), is clicked, Vickers pressing (25) is then automatically rotated to the top of sample, then slowly carry out loading, protecting the program test of carrying, unloading, after impression test is complete, Vickers pressing automatic rotation is withdrawn, eyepiece (26) can be automatically rotated to above specimen surface, is convenient to experimenter and carries out observation and analysis;
(6), in the analysis software interface of computing machine, utilize mouse and acquisition system to test the crack length at the cornerwise length of remaining impression, remaining impression drift angle place, and preserve;
(7), by regulating example platform (22), the surface of mobile sample, second time impression test is carried out in preparation, regulate runner (24), increase or reduce indentation load, repeating step (three) to step (six), complete the impression test of more than 3 times, after requiring that each test terminates, preserve corresponding experimental data files respectively;
(8), in the analyzing software system of computing machine, read the experimental data files of above-mentioned preservation correspondence, then can obtain the average microhardness of tested brittle coating material, the fracture toughness at tested place and unrelieved stress.
2. method according to claim 1, is characterized in that:
The microhardness of measured point:
Wherein, H is the microhardness of measured point, D
1and D
2for remaining impression two cornerwise length, P is each maximum load load; By the impression fracture test under the load different condition of hard brittle material being carried out to more than 3 times, measure and gather out the crack length at the magnitude of load in each experiment, the cornerwise length of remaining impression, remaining impression drift angle place, then by the load of each experiment test and crack length data with (P/C
3/2, C
1/2) form carry out linear fit, obtain unrelieved stress and the fracture toughness of measured point respectively from the straight slope simulated and intercept; Wherein,
When measured material is single hard brittle material,
Wherein σ
rrepresent the unrelieved stress at measured point place, χ=0.015 (E/H)
1/2, K
iCfor the stress intensity factor that measured material is produced by indentation load and unrelieved stress in Indentation Cracking process, C is the crack length at each remaining impression drift angle place, E and H represents elastic modulus and the hardness of tested single hard brittle material respectively; Suitable mathematic(al) manipulation is carried out to formula (2), obtains C below
1/2and P/C
3/2linear function,
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