CN104266944A - Diamond micro-powder strength characterizing method - Google Patents
Diamond micro-powder strength characterizing method Download PDFInfo
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- CN104266944A CN104266944A CN201410547353.3A CN201410547353A CN104266944A CN 104266944 A CN104266944 A CN 104266944A CN 201410547353 A CN201410547353 A CN 201410547353A CN 104266944 A CN104266944 A CN 104266944A
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- diadust
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Abstract
The invention discloses a diamond micro-powder strength characterizing method. The diamond micro-powder strength is evaluated through combination of a grain size analysis system and an impact testing system. According to the method, steel balls and diamond micro-powder are put into an impact tank for impacting, a sample is taken out after impacting, the grain sizes before impacting and after impacting are detected, and the strength of diamond micro-powder with different grain sizes are characterized after main grain size characteristic values before impacting and after impacting are calculated and compared.
Description
Technical field:
The present invention relates to diadust quality detection technology, particularly relate to a kind of characterizing method of diadust intensity.
Background technology:
Diadust is a kind of meticulous super hard abrasive (generally below 60 microns), is normally raw material with synthetic diamond single crystal, obtains, have a wide range of applications in superhard material field through operations such as fragmentation, shaping, classification, process.
The quality how evaluating micro mist seems most important, have on the net one section " determining several Con trolling index of diadust quality " by name at Chinese superhard material, the intensity that mainly refer to micro powder granule here depends on adamantine inherent quality, and adamantine inherent quality there is the relevant detection means of generally acknowledging to detect, main Con trolling index impact flexibility can be detected by impact flexibility and evaluate, and concrete Specimen Determination method is with reference to JB/T6571---1993 " man-made diamond or cubic boron nitride impact toughness test method " standard is carried out.But, for diadust, have not yet to see as the universally recognized strength detecting method of people.
From the related data of inquiry and seek advice from the information summary obtained in industry and draw, at present, the method evaluating diadust intensity is mainly divided three classes: one is the impact strength relying on the adamas raw material producing diadust, in general the intensity of raw material is high, and the micro mist intensity produced is also just high; Two is the anaphase effects seeing that diadust uses, if the impact strength of the composite sheet be synthesized is higher, or grinding efficiency is higher, and evaluation conclusion is exactly that the intensity of used micro mist is higher; Three is that the intensity of inscribeing one's name as mentioning diadust in " evaluation of diadust quality " 192-193 page in mineral products and geo journal the 13rd volume total 71st phase is relevant with production technology with starting material used, the evaluation that refer to micro mist intensity here adopts a kind of small-sized batch mixer to carry out, evaluate the intensity of diadust with the number of the amounts of particles of 1 to 4 micron, and show that experiment parameter will adjust by putting into practice.
Front two class methods more than evaluating diadust intensity all rule of thumb judge substantially, and concerning micro mist be suitable for side, the micro mist of the different grades that can only provide according to supplier distinguishes, cannot reasonably judge before use, the sincerity of supplier can only be leaned on or use the reaction in later stage to evaluate, this can affect result of use to a great extent, also cannot control the diadust stability provided; For the method that the 3rd class is mentioned in journal of writings, do not carry out detailed statement and experiment proof, and the how much very difficult accurate of amounts of particles of 1 to 4 micron is judged, also the micro mist of different grain size segment limit is not carefully studied, this for diadust intensity evaluation or there is very large deficiency.
Summary of the invention:
The object of the invention is the deficiency in order to overcome existing diadust intensity detection technology and provide a kind of characterizing method of diadust intensity, its combines and utilizes sreen analysis system and impulse test system to evaluate the intensity of diadust.
In order to solve the problem, the technical solution used in the present invention is: a kind of characterizing method of diadust intensity, and the method comprises the following steps:
Step one, puts into steel ball and diadust and impacts tank, and be fixed in the sample mount of Apparatus for Impacting at low-temp by impact tank after covering pad and end cap, the frequency of impact regulating Apparatus for Impacting at low-temp is 2000 revs/min, and number of shocks is set to 2000 times;
Step 2, takes out the sample after having impacted, and the sample after impacting with the analysis of granularity Detection instrument also records three grain size characteristic value D3
after impact, D50
after impact, D97
after impact;
Step 3, calculate the rate of change of the main grain size characteristic value D50 before and after impacting, the computing formula of employing is
Further, the diameter of described steel ball is 8mm, and putting into the diadust quality of impacting tank is 0.3-0.5g.
The present invention can be distinguished the diadust of different grain size scope and varying strength to be compared, and is tested by the micro mist sorted out different grain size scope and varying strength adamas raw material.Result shows, the present invention can characterize the intensity of diadust in conjunction with sreen analysis and impulse test, can realize goal of the invention, and effect is apparent.
Accompanying drawing illustrates:
Fig. 1 is the wiring layout of impact tank, hard metal tip, steel ball and the end cap that in the present invention, impulse test is used;
Fig. 2 is the variation trends figure of different grain size diadust in embodiment 1;
Fig. 3 is the variation trends figure of different grain size diadust in embodiment 2.
Embodiment:
Below in conjunction with accompanying drawing, the embodiment in the present invention is described further.
The invention provides a kind of characterizing method of diadust intensity, the method comprises powder size analysis and impulse test.
Sreen analysis in the present invention is the particle size range adopting modern analytical technique to analyze diadust, utilize the Malvern laser particle size detector comparing accreditation in the world, model is mastersizer2000, measurement range is 0.02 ~ 2000 micron, adopt laser diffractometry and complete mie light scattering theory to carry out survey calculation, test data accurately and reliably.
Adopt D3, D50, D97 tri-eigenwerts to carry out illness that has not attacked the vital organs of the human body in the present invention, the implication of three eigenwerts respectively: D3=x represent detect sample size-grade distribution in be less than or equal to x value granule number account for total 3%; D50=y represents that the granule number being less than or equal to y value in the size-grade distribution detecting sample accounts for 50% of sum; D97=z represents that the granule number being less than or equal to z value in the size-grade distribution detecting sample accounts for 97% of sum.
Described impulse test utilizes converter technology, is 2000 revs/min at frequency of impact, the diadust of 0.3g put into the impact tank that one-tenth " 8 " word with a steel ball operates and impact.
The concrete grammar of impulse test is that clean impact tank put into by steel ball by diameter, then diadust is poured into and impact in tank, and impact tank is fastened in the sample mount of Apparatus for Impacting at low-temp, regulate frequency of impact to be 2000 revs/min, number of shocks is set to 2000 times.Taking-up sample after impact completes, after impacting with the analysis of granularity Detection instrument, sample draws three grain size characteristic value D3
after impact, D50
after impact, D97
after impact, the main changing value with D50 impact front and back represents here.Calculate the rate of change of the main grain size characteristic value D50 before and after impacting, computing formula:
In this formula, w value is less, shows that the granule number that micro mist impacts front and back broken is fewer, shows that the intensity of diadust is higher, otherwise lower.The strength degree of diadust is evaluated by the variation tendency of the size of w value and the w value of varigrained micro mist.
The present invention can be distinguished the diadust of different grain size scope and varying strength to be compared, and is tested by the micro mist sorted out different grain size scope and varying strength adamas raw material.Result shows, the present invention can characterize the intensity of diadust in conjunction with sreen analysis and impulse test, can realize goal of the invention.
Be below a kind of embodiment 1 of the present invention, tested the intensity of the varigrained diadust that low product grade diamond raw material sub-elects by this method.
Choose the adamas raw material of low grade, after being detected by examination criteria general in industry, the impact strength of adamas raw material is expressed as 67.5% with non-percentage of damage.The diadust of four kinds of different grain size scopes chosen respectively by this raw material after fragmentation, shaping, sorting, pickling.Concrete grammar according to impulse test:
The first step, be that clean impact tank put into by the steel ball of 8mm by diameter, then the diadust of 0.3g is poured into and impact in tank, after covering pad and end cap, impact tank is fastened in the sample mount of the Apparatus for Impacting at low-temp of CYCJ-91A, regulate frequency of impact to be 2000 revs/min, number of shocks is set to 2000 times.Impact the assembling of tank 4 and end cap 1, steel ball 3, hard metal tip 2 as shown in Figure 1.
Second step, has impacted rear taking-up sample, utilizes Malvern laser particle analyzer to detect the granularity before and after impacting respectively.
3rd step, calculates the rate of change of the main grain size characteristic value D50 before and after impacting, computing formula:
Detection data and result of calculation refer to following table:
| Specifications and models | Before D50 impacts | After D50 impacts | w |
| 2-5 | 2.98 | 2.66 | 0.11 |
| 8-12 | 8.47 | 7.25 | 0.14 |
| 10-20 | 12.86 | 10.93 | 0.15 |
| 30-40 | 30.02 | 24.93 | 0.17 |
Fig. 2 is the variation trends figure of the varigrained diadust that low product grade diamond raw material sub-elects.The curve of Fig. 2 represents the adamas raw material for low grade, the percentage of damage sub-electing varigrained diadust is differentiated, and granularity is larger, is more easily broken in the process of impacting, illustrate that the fragility of this diadust is comparatively large, intensity is not high.
Embodiment 2: the strength test of the varigrained diadust that high grade diamond raw material sub-elects.
Experimental technique described in embodiment 2 is identical with example 1, and difference is that the grade of selected adamas raw material is different, and higher than the grade in example 1, the non-percentage of damage of impact strength is expressed as 85.6%.Detection data and the result of calculation of the four kinds of varigrained micro mists sub-elected refer to following table:
| Specifications and models | Before D50 impacts | After D50 impacts | w |
| 3-6 | 3.51 | 3.12 | 0.091 |
| 8-12 | 9.37 | 8.48 | 0.095 |
| 10-20 | 12.85 | 11.65 | 0.093 |
| 36-54 | 37.56 | 33.95 | 0.096 |
Fig. 3 is the variation trends figure of the varigrained diadust that high grade diamond raw material sub-elects.The curve of Fig. 3 represents that the varigrained adamantine percentage of damage difference that this adamas raw material sub-elects is little, illustrate that the granule number that in impact process, diadust is broken is less, bear extraneous damage capability stronger, the intensity of diadust is higher, w value is worth less compared with the w in example 1 simultaneously, illustrate that w value is less for granularity close micro mist, show that the intensity of this diadust is relatively higher.
By the micro mist of 10-20 basically identical for the particle size range sub-elected in embodiment 1 and 2 for the synthesis of polycrystalline diamond compacts (PDC), by the impact strength of drop hammer test inspection diamond compact, according to impact experiment feedback result, the number of shocks of bearing under same energy by the 2-in-1 one-tenth of embodiment composite sheet is out more, the conclusion also demonstrating embodiment 1 and 2 is convictive, also show the workability of this invention.
Last it is noted that obviously, above-described embodiment is only used to example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments, and thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (2)
1. a characterizing method for diadust intensity, the method comprises the following steps:
Step one, be that steel ball and diadust put into impact tank by diameter, be fixed in the sample mount of Apparatus for Impacting at low-temp by impact tank after covering pad and end cap, the frequency of impact regulating Apparatus for Impacting at low-temp is 2000 revs/min, and number of shocks is set to 2000 times;
Step 2, takes out the sample after having impacted, and the sample after impacting with the analysis of granularity Detection instrument also records three grain size characteristic value D3
after impact, D50
after impact, D97
after impact;
Step 3, calculate the rate of change of the main grain size characteristic value D50 before and after impacting, the computing formula of employing is
2. the characterizing method of a kind of diadust intensity according to claim 1, is characterized in that: the diameter of described steel ball is 8mm, and putting into the diadust quality of impacting tank is 0.3-0.5g.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931319A (en) * | 2015-06-18 | 2015-09-23 | 河南四方达超硬材料股份有限公司 | Sample preparation method for detecting large particles in diamond subtle powder |
| CN105411695A (en) * | 2015-12-07 | 2016-03-23 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Diamond alkene implant and manufacturing method thereof |
| CN106404572A (en) * | 2016-08-30 | 2017-02-15 | 镇江荣德新能源科技有限公司 | Detection method for hardness of micron-size ultrahard grinding materials |
| CN111189716A (en) * | 2019-07-08 | 2020-05-22 | 中交二航局第四工程有限公司 | Test method for evaluating strength change of crushed stone in different cooling states |
| CN114199610A (en) * | 2021-12-13 | 2022-03-18 | 郑州磨料磨具磨削研究所有限公司 | Diamond strength testing device and method |
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2014
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| JPS6332345A (en) * | 1986-07-25 | 1988-02-12 | Toa Medical Electronics Co Ltd | Analysis of grain size distribution |
| CN201784215U (en) * | 2010-05-26 | 2011-04-06 | 郑州新亚复合超硬材料有限公司 | Diamond/hard alloy compact |
| CN102249236A (en) * | 2011-06-02 | 2011-11-23 | 江苏大阳微粉科技有限公司 | Production process for silicon carbide micropowder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931319A (en) * | 2015-06-18 | 2015-09-23 | 河南四方达超硬材料股份有限公司 | Sample preparation method for detecting large particles in diamond subtle powder |
| CN105411695A (en) * | 2015-12-07 | 2016-03-23 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Diamond alkene implant and manufacturing method thereof |
| CN106404572A (en) * | 2016-08-30 | 2017-02-15 | 镇江荣德新能源科技有限公司 | Detection method for hardness of micron-size ultrahard grinding materials |
| CN111189716A (en) * | 2019-07-08 | 2020-05-22 | 中交二航局第四工程有限公司 | Test method for evaluating strength change of crushed stone in different cooling states |
| CN114199610A (en) * | 2021-12-13 | 2022-03-18 | 郑州磨料磨具磨削研究所有限公司 | Diamond strength testing device and method |
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