Two paces handle electrochemistry to grind the influence of function of YG6 hard alloy and diamond coating to essence of life

1The exterior pretreatment experiment of matrix of YG6 hard alloy uses the seed that from tribute hard alloy factory produces to worry bit of mill of YG6(WC- 6%Co) hard alloy (model is 413108) , measurement standards is 12mm × 13.

4mm × 4.

9mm. Sample surface uses acetone respectively solution and go ionic water undertakes supersonic the air after cleaning. The first pace, adopt a plan 1 shows electrochemistry device to corrode matrix surface, electrolyte is 10%NaOH solution, electrochemistry type is respectively hand in, dc, voltaic size is 1A, 5A respectively, electrochemistry corrodes time to be 0- 20min; the 2nd pace, with HCl of aqua regia solution: HNO3:H2O= 1: 1: 1(bulk is compared) dip corrode 0-25min. The sample after pretreatment is mixed with acetone 0.

Diamond of 5 μ M is small powdery mixed liquor, be in supersonic 15min of the oscillation in cleaning appearance. 2.

Atom of pH indicator of the Co in solution of 2 acid etching absorbs spectrum to determine use reagent of CoC12 · 6H2O to make up Co standard solution, next its decide reoccupy calibrating curve. It is with calibrating curve consult, atom of use Hitachi 180- 50 absorbs spectrometer to undertake quantitative analysis to the Co chroma in the solution after 90s of re-etching of aqua fortis of the 2nd pace, test condition is: Cobaltic illuminant, wavelengh 240.

7nm, 10mA of working electric current, spectral bandwidth 0.

4nm, burner height 7mm. 2.

Experiment of deposit of gas phase of 3 diamond film uses device of plated film of plasma of dc arc discharge, the surface of cutting tool of YG6 hard alloy after passing pretreatment has test of diamond film deposit. Gas source is argon gas, hydric, firedamp. Ar discharge is 600ml/ Min, h2 discharge is 700ml/ Min, CH4/ H2 is compared for 0.

96% , deposit time 60min, reaction is baric 3 × 104 Pa, working voltage 40-70V, 10- 15A of working electric current, ℃ of underlay temperature 800- 1000. 2.

4 function test uses HRM- 45DT cloth Rockwell hardness plan measure the film that corrodes cutting tool of change of hardness of around sample surface and diamond film coating base function; uses German Perthometer(M3P) dynamoelectric contourgraph to measure change of surface roughness of surface of the sample after two paces handle electrochemistry, sampling length uses electron microscope of scanning of Japanese Hitachi (S- 530) for 48mm; (accessary EDX can chart) the constituent body appearance of the diamond film after the analysis is deposit and the change that corrode Co/WC of around sample surface. Filmy character by British Renishaw Invia laser in all appraisal of Jiao Laman spectrometer (argon ion laser, wavelengh 514.

5nm) . 3 results and discuss 3.

The influence that two paces corrode 1 electrochemistry to grind matrix surface to organize to essence of life pursues the 2 SEM photographs that corrode around essence to grind YG6 matrix surface to organize to differ. Graph 2a organizes a photograph for primitive matrix, can observe matrix apparently because of abrade and become " crustaceous " , scrape clarity is visible. Graph 2b corrodes the constituent photograph after 40min via aqua regia for its, observe groovy acid etching cannot purify this " crustaceous " , cause the Co photograph suffocate suffocate of deep of farther purify matrix. After graph 2c, D and graph 2e, F is communication 5A and dc 1A electrochemistry to corrode 10- 20min respectively respectively, the SEM photograph that surface of the matrix after 90 S of aqua regia re-etching organizes, can see from which, communication and dc chemistry corrode but of purify matrix surface " crustaceous " ; among them the constituent feature that voltaic type wears matrix face to essence of life has bigger effect: The WC grain brim of surface of the matrix after via alternating current chemistry two paces are corroded is relatively smooth and fruity, uniformity is poorer, WC grain is relatively isolated, put in bigger gap, fall off easily, intensity is poorer, lengthen corrode time appearance of microcosmic to its form affects lesser; and dc chemistry processing increases as what corrode time, can of grain of WC of aggravate matrix surface thick change rate, increase the crystal boundary amount of WC grain, produced more tiny flaw in its surface, the grain after corroding is relatively compact and even. Graph 3a is the EDX table chart of primitive matrix surface, co/W is about 6% , graph 3b is afore-mentioned classics electrochemistry the EDX chart of surface of the matrix after two paces pursues (pursue identical as a result of the EDX chart of every sample, list only thereby one) , show Co peak disappears in the graph, after the Co classics aqua fortis that confirms sample surface corrodes 90s already by purify. 3.

2 electrochemistry corrode the influence that grinds matrix surface surface roughness to essence of life to consider to make clear, matrix surface is rough change the form nucleus density that is helpful for raising diamond coating, be helpful for enhancing diamond coating tool velar radical intensity. But, excessive thick the matrix face that change grows to the form nucleus of diamond reach coating surface is bright and clean degree all have negative effect, because this need is thick to its,change degree to undertake be controllinged effectively. Theoretic electrochemistry is corroded it is OK to reach acid etching to matrix surface thick change degree to produce an effect, but from the graph 3 knowable, the Co photograph of surface of matrix of basic already purify after 90s of aqua regia acid etching, and from graph 2b knowable, its cannot be corroded basically to the WC of matrix surface, lengthen its to corrode time thereby the influence of microcosmic to matrix surface outline corrodes at electrochemistry relatively, basic negligible. Accordingly, corrode aqua regia time constant for 90s, studied electrochemistry corrodes the time influence to matrix surface surface roughness systematically next. Graph 4 grind arithmetic of outline of Ra(of matrix surface surface roughness for essence of life average deviation) , Rz (outline is microcosmic and rough degree at 10 o'clock height) corrode time along with electrochemistry metabolic relation curve. Can see from which, inside specific time, ra, Rz can follow matrix surface surface roughness hand in, straight electrochemistry corrodes time to lengthen and rise. But inside unit time, alternating current chemistry should be less than dc to the influence of matrix surface surface roughness. Corrode principle of reaction of the electrode in the process according to electrochemistry, reaction of stainless steel cathode is equational: NNa of → of A+ + E, essence of; of ↑ of NaOH+ H2 of → of Na+ + H2O grinds equation of reaction of cutting tool positive pole: ↑ of WO32- + CO2 of → of WC+ OH- + H2O, knowable dc chemistry is corroded is one electroanalysises essentially process, basically be the WC in grinding matrix to essence of life corrode. Because this is below the circumstance with electrolyte chroma, composition and constant current density, the microcosmic outline of surface of the matrix after electrochemistry is corroded also depends on corrode time. And alternating current chemistry grinds the WC in matrix to essence of life corrupt a process, present positive and negative of pole of yin and yang the frequency of 50Hz of half weeks of every second undertakes alternately, lag appearance is had in reaction process, when electromotive force difference still does not have the reaction that week of other in part already turned to when be being eliminated completely, be opposite thereby of matrix surface WC corrode efficiency inferior, cause its to be inferior to dc to the influence of the surface roughness of matrix surface remarkable. 3.

3 electrochemistry corrode time to pursue to the influence of matrix hardness the metabolic circumstance that what 5 medium two cento lines mirror respectively is weightlessness of the matrix after be being corroded via electrochemistry of the first pace and matrix hardness. From weightlessness the curve can see, no matter be communication or dc,corrode, matrix weightlessness corrodes the extension of time as electrochemistry and increase. But alternating current chemistry is right of matrix corrode efficiency inferior, the weightlessness amount that after its corrode 20min, causes is 66.

2mg, be equivalent to dc 1A corroding the weightlessness of 2- 3min to measure only. From hardness the curve can see, matrix hardness corrodes the addition of time as electrochemistry and drop, but the fall of hardness of the matrix after dc chemistry is corroded extent wants apparent under communication. This shows, degree and matrix hardness show the weightlessness of the matrix after essence of life grinds matrix classics electrochemistry to corrode to perform a relation instead, namely electrochemistry pretreatment also can make while the WC in causing matrix is corroded matrix hardness drops. 3.

Time of acid etching of 4 aqua fortis affects B to pH indicator of the Co in acid etching solution.

Sahoo points out, the optimal effect after matrix corrodes via chemical law is: Can increase matrix surface surface roughness effectively to enhance the machinery between diamond and WC grain to lock up join forces on one hand, the Co content that can reduce matrix surface effectively on the other hand will obtain tall nucleus density and coating of film of high quality diamond. Part thereby constant of dc 1A electrochemistry corrode what time is 5A of 5min, communication to corrode time to be 10min, use atom to absorbed spectrometer ration to study time of aqua regia acid etching is right the influence of the Co content of purify matrix surface. Graph the sample after the 6 dc 1A that determine to use atom to absorb spectral law corrode 5A of 5min, communication to corrode 15min again 0- 25min of acid etching of classics aqua fortis, the relation curve of chroma of the Co in aqua regia solution and acid etching time. Can see from inside the graph, inside specific time, chroma of the Co in solution of aqua regia acid etching rises along with the addition of time of aqua regia acid etching, after that amplitude changes delay; is inside same acid etching time, apparent prep above communicates chroma of the Co in solution of acid etching of the sample after dc chemistry is corroded. Because essence of life grinds matrix of YG6 hard alloy to part,this is via handing in, after straight electrochemistry is corroded, matrix surface exposes exposed Co content and WC to suffer corrode what different place causes rate. Above all, after because essence of life grinds electrochemistry of classics of matrix of YG6 hard alloy,be being corroded, the WC of matrix surface is differred of degree corrode, make Co photograph binder is exposed come out, and this part Co is easier by aqua regia purify, make chroma of the Co in solution increases considerably, because chemistry of communication, dc corrodes the difference that corrodes degree to matrix, bring about Co chroma amplitude to differ thereby, graph 5 atom absorb spectral result to show, 0- 5min, amplitude of chroma of the Co in the solution after dc changes play the ape to taste classics acid etching is 6 μ G/ml about, for 4 times of communication. Corrode proper time when aqua regia (dc sample is 5min, after communication sample is 10min) , change pair of matrix deep to Co gradually corrode, because get of the WC in matrix hold back reach solute to diffuse the lengthen of the passageway is deepened, cause go Co obstruction greatens, bring about its amplitude to change delay. Right now, space of crystal boundary of immerge of aqua regia solution infiltrates the fluid property of the speed of crystal boundary surface and aqua regia itself, the geometrical appearance of situation of matrix surface energy and solution immerge passageway is concerned. Compare with communication, dc chemistry is corroded through " thick change " matrix surface WC, the crystal boundary amount that increases WC grain (2e seeing a picture, F) , space of crystal boundary of WC of immerge of aqua regia solution is inside unit area offerred more immerge channel, of the Co photograph that can raise pair of matrix deep thereby through extending time of aqua regia acid etching corrode. The place on put together is narrated, technique of two footwork pretreatment goes dc chemistry effectively Co and increase matrix surface surface roughness, and have first-rate can charge a sex. 3.

The character of coating of the diamond on matrix of two paces pretreatment and performance plan 7a are 5 electrochemistry the SEM photograph of the deposit diamond coating on the matrix after via dc chemistry two footwork are handled. Can see from which, diamond coating is compact and even, main brilliant face appears (100) orientaton, grain is given priority to with cubic octahedron, grain dimension is about 1.

3 μ M is controlled, in its corresponding Raman scattering chart besides 1333.

SP3 is miscellaneous near 13cm- 1 outside the scattering feature peak that changes diamond structure, compare evenness elsewhere, the quality that demonstrates diamond coating is higher. Graph 7b is chemistry of classics alternating current the constituent photograph of the diamond film of the preparation on the matrix after two footwork pretreatment, show in the graph, the WC grain with matrix bulky surface is enclothed by a granular substance, exterior presence is larger empty, two medium wide peaks divide its corresponding Raman scattering chart to be located in respectively 1344, peak of peak of 1580cm- 1(D, G) , show this material is accept rice black lead. Graph the impress picture that the diamond coating cutting tool of the 8 preparation after for classics dc chemistry two footwork handle pretreatment leaves in 60kg load action, can see from inside the graph diamond film is in good condition nondestructive, impress expands 150 μ M, expand without occurrence crackle all round impress and film flakes phenomenon, proof diamond coating has good film base function. The WC grain of surface of the matrix after two paces handle alternating current chemistry is relatively loose, each other are isolated, bigger gap exists between grain (2c seeing a picture, D) , fall off easily, as a result of state of surface of the matrix after processing not beautiful, handle itself of coating of diamond of the preparation on the matrix after not to have economic value in this method thereby, graph 7b also announces diamond coating handles nucleus of the form on the matrix after in this method hard, be not black lead of rice of diamond photograph accept to generate only, estimation is photograph of the Co in deposit process be caused by of graphitization of migratory hurried diamond. And dc is chemical two footwork are OK and effective the Co content in matrix of thorough ground purify, at the same time can of grain of WC of aggravate matrix surface thick change rate, the research matrix surface according to forefathers is rough change can increase the area that compare a list, surface can, be helpful for adding the infiltration part between diamond grain and matrix, the form nucleus of stimulative diamond, the diamond coating that achieved compact level thereby (7a) seeing a picture. In addition, graph 2c, D shows dc chemistry corrodes the crystal boundary amount that increased WC grain, increased film thereby / base the actual contact area between, corrode the edges and corners that makes WC grain formed acuteness at the same time, enhanced diamond coating and WC grain between " anchor chain " effect, the film that causes acquisition diamond coating cutting tool base strength is better, because this is comfortable,collaboration grinds the pre-treatment technology of matrix for essence of life. Because dc chemistry corrodes craft to go to matrix surface,the influence existence of Co chroma and exterior surface roughness compares apparent difference, will naturally produce distinct effect to diamond coating preparation and function thereby, but the limitation as a result of length, cannot have the research of thorough, system to its here, about this part content will have technical research to have a story. 4 epilogue are handed in, dc chemistry corrodes essence of OK and effective purify to grind WC of surface of YG6 alloy matrix " cuticular " . Type of electrochemistry electric current, electrochemistry corrodes the craft parameter such as time, acid etching time to grind surface of YG6 alloy matrix to organize content of structure, surface roughness, Co and mechanical function to have distinct effect to essence of life. Alternating current chemistry corrodes efficiency to what essence of life grinds matrix inferior, the form nucleus that the matrix surface state after via its two paces are handled goes against diamond film and grow, what grind matrix pretreatment technology as essence of life is practical poorer. Dc is chemical two footwork are OK and effective content of Co of purify matrix surface, and of grain of WC of aggravate matrix surface thick change rate, increase the crystal boundary amount of WC grain, the essence after corroding 90s of re-etching of 5min, aqua fortis via dc 1A electrochemistry grinds hard metal more high quality, film radical was obtained on matrix the diamond coating with adherent good performance, suit to grind the pre-treatment technology of matrix as essence of life. CNC Milling CNC Machining