CN105435913B - The preparation method of non-equivalance shape cubic boron nitride crystal - Google Patents
The preparation method of non-equivalance shape cubic boron nitride crystal Download PDFInfo
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- CN105435913B CN105435913B CN201510997672.9A CN201510997672A CN105435913B CN 105435913 B CN105435913 B CN 105435913B CN 201510997672 A CN201510997672 A CN 201510997672A CN 105435913 B CN105435913 B CN 105435913B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- Engineering & Computer Science (AREA)
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- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention discloses a kind of preparation method of non-equivalance shape cubic boron nitride crystal, belong to grinding tool, abrasive techniques field.This method coordinates the steel ball of different-diameter step by step, largest diameter 25mm and minimum diameter Φ 12mm steel ball dosage are less, intermediate specification Φ 20mm, the steel ball dosage of Φ 16mm diameters are more, the non-equivalance shape cubic boron nitride crystal of ellipticity 1.4~1.6 can not only be produced using the steel ball matching, also ensure that the size grading of discharging crystal grain is stable, the sharp property of crystal is well to reach superior using effect, while Ball Mill loss rate is low, replacement cycle length.The preparation technology of non-equivalance shape cubic boron nitride crystal is simple in the present invention, it is easy to operate, on the premise of crystal outward appearance and physical property is ensured, invalid stock can be converted into effective sale, the market demand, which has positive effect, to be met to energy-saving, reduction production cost, shortening delivery date.
Description
Technical field
The present invention relates to a kind of preparation method of non-equivalance shape cubic boron nitride crystal, belong to grinding tool, abrasive techniques field.
Background technology
Cubic boron nitride (CBN) be hexagoinal lattice boron nitride at high temperature under high pressure through catalyzer contact agent act on polymerization conversion into
High density crystal, its atomic structure is similar with the atomic structure of carbon in diamond, therefore has high density characteristic, and hardness is only second to
Diamond, it is often used as abrasive material and cutter material.In addition, cubic boron nitride also has higher heat endurance and chemistry lazy
Property, and good saturating infrared property and wider energy gap.
Excellent physical properties based on cubic boron nitride abrasive materials in machining, it is in automobile, air-conditioning, aviation, military project
It is widely used Deng field.But because the limitation of synthesis technique, the synthesis of hexagonal boron nitride to cubic boron nitride change
Process can not be entirely controlled, and processing range is narrow, fluctuation is big, is not easy to obtain finished product.Generally non-equivalance shape cube nitridation
The yield rate peak value only 6%~8% of boron simple grain degree product, synthesis cost it is higher (non-blocky crystal be crystal major axis with it is short
The crystal in irregular shape such as needle-like of the axis scale more than 1.5, sheet；Blocky crystal is that the major axis of crystal and short axle ratio exist
Oval-shaped ball within 1.5).At present, non-equivalance shape cube nitrogen of the in the market to 80/100,100/120,120/140 granularity
Changing the demand of boron crystal, often supply falls short of demand, irregular especially based on gill shape with acute angle crystal (ellipticity 1.4~
1.7) it is, less to the demand of other granularity products, cause serious stock.To reduce production cost, coarse grain is utilized
Spend product and prepare the non-equivalance shape cubic boron nitride of fine granularity, can effectively reduce stock, improve the non-equivalance shape product of fine granularity
Market supply.
The content of the invention
It is an object of the invention to provide a kind of preparation method of non-equivalance shape cubic boron nitride crystal.
In order to realize the above object the technical solution adopted in the present invention is：
The preparation method of non-equivalance shape cubic boron nitride crystal, comprises the following steps：
1) steel ball of different-diameter is fitted into broken tank, be calculated in mass percent, steel ball matching is as follows：
Φ 25mm steel balls 18~23%,
Φ 20mm steel balls 30~45%,
Φ 16mm steel balls 25~40%,
Φ 12mm steel balls 8~12%；
2) cubic boron nitride crystal to be broken is added, rotates 5~30 minutes, isolates under 70~90 revs/min of rotating speed
Fractured crystal, screening, is produced.
In step 1) crush tank typically use specification Φ 220mm × Φ 200mm × 400mm seamless cylinder of steel, per it is canned enter
20 kilograms of steel ball.
The granularity of cubic boron nitride crystal to be broken is more than or equal to two granularities of required product in step 2), such as required
Product granularity 120/140, then raw material granularity have to be larger than or equal to 80/100.In addition, raw material can be simple grain degree or several
The mixture of granularity, the ratio no requirement (NR) of several granularities during mixture.
The addition of cubic boron nitride crystal to be broken is per 1~2 kilogram of tank in step 2).
Screening can use spin vibration sieve in step 2), 25~30MHz of vibration frequency, feed intake every time 4~5 kilograms, and screening 10~
15 minutes.
The broken crystal that fails screened out in step 2) puts into broken in broken tank, this process of repetition, to whole again
It is broken to terminate.
It is pure non-equivalance shape cubic boron nitride after pickling that the qualified product of obtained granularity is sieved in step 2)
Crystal.
Beneficial effects of the present invention：
The present invention coordinates the steel ball of different-diameter step by step, and largest diameter 25mm and minimum diameter Φ 12mm steel ball are used
Measure less, intermediate specification Φ 20mm, the steel ball dosage of Φ 16mm diameters are more, and length can not only be produced using the steel ball matching
The non-equivalance shape cubic boron nitride crystal of axis scale 1.4~1.6, moreover it is possible to ensure that the size grading of discharging crystal grain is stable, crystal
Sharp property is well to reach superior using effect, while Ball Mill loss rate is low, replacement cycle length.
The preparation technology of non-equivalance shape cubic boron nitride crystal is simple in the present invention, easy to operate, is ensureing crystal outward appearance
On the premise of physical property, invalid stock can be converted into effective sale.General broken obtained one granularity energy of product
Raw material availability 15%~20% is improved, two granularities improve raw material availability 35%~40%, and three granularities improve raw material profit
With rate 40%~50%, remaining fine powder can be reprocessed into more fine-grained product or processing micro mist, energy-saving, reduction is produced
Cost, shortening delivery date meet that the market demand has positive effect.
Brief description of the drawings
Fig. 1 is the displaing micro picture of 120/140 granularity product in embodiment 1；
Fig. 2 is the displaing micro picture of 100/120 granularity product in embodiment 2；
Fig. 3 is the displaing micro picture of 230/270 granularity product in embodiment 3；
Fig. 4 is the displaing micro picture of 325/400 granularity product in embodiment 4.
Embodiment
Following embodiments are only described in further detail to the present invention, but do not form any limitation of the invention.
Embodiment 1
The preparation method of non-equivalance shape cubic boron nitride crystal, comprises the following steps：
1) steel ball of 20 kilograms of different-diameters is fitted into specification Φ 220mm × Φ 200mm × 400mm broken tank, with
Mass percentage, steel ball matching are as follows：
Φ 25mm steel balls 20%,
Φ 20mm steel balls 40%,
Φ 16mm steel balls 30%,
Φ 12mm steel balls 10%；
2) totally 50 kilograms of mixed material, 1 kilogram of cubic boron nitride crystal (amber product of product 980 to be broken is added every time
Board, brownish black or palm fibre are dark brown, translucent or opaque, crystal based on needle-like, sheet and irregular shape, substantially without spherical or
The octahedron of standard or eight hexahedrons, ellipticity is between 1.38~1.65, solid, sharp with acute angle；Four kinds of granularities 40/
50th, the mass ratio of 50/60,60/70,70/80 crystal is 1:2:4:9) broken tank, is sealed and by it mounted in disintegrating machine (or ball milling
Machine) on, crushed 5 minutes under 80 revs/min of tank body, it is broken terminate after pour out steel ball and fractured crystal, filter out steel ball and fill
Return in broken tank, carry out next round and crush, fed intake until completing 50 kilograms；
3) by above-mentioned fractured crystal add spin vibration sieve in, using 100 mesh, 120 mesh, 140 eye mesh screens screening 100/120,
120/140 two kinds of granularity products, spin vibration sieve vibration frequency 28MHz is set, is fed intake every time 2.5 kilograms, sieved 10 minutes；It is unbroken
100 mesh oversizes put into again in disintegrating machine, continue to crush by operation in step 2), this operating process repeatedly, until all
Unbroken raw material is completely broken, pickling purifying, 21 kilograms of non-equivalance shape CBN crystal is obtained, wherein 100/120 granularity product 12,000
Gram, 1,20/,140 9 kilograms of granularity product.
Using the above-mentioned 120/140 granularity product of stereomicroscope observation, as shown in Figure 1, it can be seen that non-equivalance shape CBN is brilliant
Body accounts for more than 80%, and the scanned ellipticity for detecting the granularity product is 1.506, meets quality standard, using effect with it is normal
Sintetics effect is no different.
Embodiment 2
The preparation method of non-equivalance shape cubic boron nitride crystal, comprises the following steps：
1) steel ball of 20 kilograms of different-diameters is fitted into specification Φ 220mm × Φ 200mm × 400mm broken tank, with
Mass percentage, steel ball matching are as follows：
Φ 25mm steel balls 18%,
Φ 20mm steel balls 45%,
Φ 16mm steel balls 25%,
Φ 12mm steel balls 12%；
2) totally 40 kilograms of mixed material, 1.5 kilograms of cubic boron nitride crystal (product of black product 810 to be broken are added every time
Board, black is sub-translucent, and crystal is based on irregular shape, a small amount of needle-like, sheet, and most of plane of crystal out-of-flatness is in rock
Shape, band acute angle, solid, sharp, relatively low compared with 980 product hardness, ellipticity is between 1.35~1.6；Four kinds of granularities 40/50,50/
60th, the mass ratio of 60/70,70/80 crystal is 1:3:5:8), seal broken tank and by it on disintegrating machine, 70 turns of tank body/
It is broken 10 minutes under minute, steel ball and fractured crystal are poured out after broken end, steel ball is filtered out and reinstalls in broken tank, carry out down
One wheel is broken, is fed intake until completing 40 kilograms；
3) above-mentioned fractured crystal is added in spin vibration sieve, using 80 mesh, 100 mesh, 120 mesh, 140 eye mesh screens screening 80/
100th, 100/120,1,20/,140 3 kind of granularity product, spin vibration sieve vibration frequency 28MHz is set, is fed intake every time 4 kilograms, screening 15
Minute；80 unbroken mesh oversizes are put into disintegrating machine again, continue to crush by operation in step 2), this was operated repeatedly
Journey, until all unbroken raw materials are completely broken, pickling purifying, 25 kilograms of non-equivalance shape CBN crystal are obtained, wherein 80/100
Spend 11 kilograms of product, 1,00/,120 8 kilograms of granularity product, 1,20/,140 6 kilograms of granularity product.
Using the above-mentioned three kinds of granularity products of stereomicroscope observation, as shown in Figure 2, it can be seen that non-equivalance shape CBN crystal
More than 70% is accounted for, the scanned ellipticity for detecting the granularity product is 1.452, meets quality standard, using effect and normal occlusion
It is no different into product effect.
Embodiment 3
The preparation method of non-equivalance shape cubic boron nitride crystal, comprises the following steps：
1) steel ball of 20 kilograms of different-diameters is fitted into specification Φ 220mm × Φ 200mm × 400mm broken tank, with
Mass percentage, steel ball matching are as follows：
Φ 25mm steel balls 20%,
Φ 20mm steel balls 30%,
Φ 16mm steel balls 40%,
Φ 12mm steel balls 10%；
2) totally 200 kilograms of mixed material, 1 kilogram of cubic boron nitride crystal (amber product of product 980 to be broken is added every time
Board, brownish black or palm fibre are dark brown, translucent or opaque, crystal based on needle-like, sheet and irregular shape, substantially without spherical or
The octahedron of standard or eight hexahedrons, ellipticity is between 1.38~1.65, solid, sharp with acute angle；Two kinds of granularities 140/
170th, the mass ratio of 170/200 crystal is 1:1) broken tank, is sealed and by it on disintegrating machine, under 70 revs/min of tank body
It is broken 20 minutes, steel ball and fractured crystal are poured out after broken end, steel ball is filtered out and reinstalls in broken tank, next round is carried out and breaks
It is broken, fed intake until completing 200 kilograms；
3) above-mentioned fractured crystal is added in spin vibration sieve, 230/270 granularity product is sieved using 230 mesh, 270 eye mesh screens,
Spin vibration sieve vibration frequency 28MHz is set, is fed intake every time 2 kilograms, is sieved 20 minutes；230 unbroken mesh oversizes are put into again
In disintegrating machine, continue to crush by operation in step 2), this operating process repeatedly, until all unbroken raw materials are completely broken, acid
Purifying is washed, obtains 32 kilograms of non-equivalance shape CBN crystal.
Using the above-mentioned 230/270 granularity product of stereomicroscope observation, as shown in Figure 2, it can be seen that non-equivalance shape CBN is brilliant
Body accounts for more than 90%, and the scanned ellipticity for detecting the granularity product is 1.589, meets quality standard, using effect with it is normal
Sintetics effect is no different.
Embodiment 4
The preparation method of non-equivalance shape cubic boron nitride crystal, comprises the following steps：
1) steel ball of 20 kilograms of different-diameters is fitted into specification Φ 220mm × Φ 200mm × 400mm broken tank, with
Mass percentage, steel ball matching are as follows：
Φ 25mm steel balls 23%,
Φ 20mm steel balls 35%,
Φ 16mm steel balls 34%,
Φ 12mm steel balls 8%；
2) totally 20 kilograms of mixed material, 1 kilogram of cubic boron nitride crystal (amber product of product 980 to be broken is added every time
Board, brownish black or palm fibre are dark brown, translucent or opaque, crystal based on needle-like, sheet and irregular shape, substantially without spherical or
The octahedron of standard or eight hexahedrons, ellipticity is between 1.38~1.65, solid, sharp with acute angle；Two kinds of granularities 140/
170th, the mass ratio of 170/200 crystal is 1:1) broken tank, is sealed and by it on disintegrating machine, under 80 revs/min of tank body
It is broken 20 minutes, steel ball and fractured crystal are poured out after broken end, steel ball is filtered out and reinstalls in broken tank, next round is carried out and breaks
It is broken, fed intake until completing 20 kilograms；
3) above-mentioned fractured crystal is added in spin vibration sieve, 325/400 granularity product is sieved using 325 mesh, 400 eye mesh screens,
Spin vibration sieve vibration frequency 28MHz is set, is fed intake every time 1 kilogram, is sieved 20 minutes；325 unbroken mesh oversizes are put into again
In disintegrating machine, continue to crush by operation in step 2), this operating process repeatedly, until all unbroken raw materials are completely broken, acid
Purifying is washed, obtains 3.2 kilograms of non-equivalance shape CBN crystal.
Using the above-mentioned 325/400 granularity product of stereomicroscope observation, as shown in Figure 4, it can be seen that non-equivalance shape CBN is brilliant
Body accounts for more than 90%, and the scanned ellipticity for detecting the granularity product is 1.595, meets quality standard, using effect with it is normal
Sintetics effect is no different.
Claims (5)
1. the preparation method of non-equivalance shape cubic boron nitride crystal, it is characterised in that：Comprise the following steps：
1) steel ball of different-diameter is fitted into broken tank, be calculated in mass percent, steel ball matching is as follows：
Φ 25mm steel balls 18~23%,
Φ 20mm steel balls 30~45%,
Φ 16mm steel balls 25~40%,
Φ 12mm steel balls 8~12%；
2) cubic boron nitride crystal to be broken is added, rotates 5~30 minutes, isolates broken under 70~90 revs/min of rotating speed
Crystal, screening, is produced；
The granularity of cubic boron nitride crystal to be broken is more than or equal to two granularities of required product in step 2).
2. preparation method according to claim 1, it is characterised in that：In step 1) crush tank using specification Φ 220mm ×
Φ 200mm × 400mm seamless cylinder of steel, per it is canned enter 20 kilograms of steel ball.
3. preparation method according to claim 2, it is characterised in that：Cubic boron nitride crystal to be broken adds in step 2)
It is per 1~2 kilogram of tank to enter amount.
4. preparation method according to claim 1, it is characterised in that：Cubic boron nitride crystal to be broken is simple grain degree product
Or the mixture of several granularity products.
5. preparation method according to claim 1, it is characterised in that：Screening uses spin vibration sieve, vibration frequency in step 2)
25~30MHz, feed intake 4~5 kilograms, sieve 10~15 minutes every time.
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| CN112138835B (en) * | 2020-09-02 | 2023-09-26 | 郑州中南杰特超硬材料有限公司 | Shaping method of cubic boron nitride and application thereof |
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| JPH0824692A (en) * | 1994-05-09 | 1996-01-30 | Denki Kagaku Kogyo Kk | Method and vessel for crushing |
| CN100582322C (en) * | 2006-11-08 | 2010-01-20 | 北京国瑞升科技有限公司 | Nano monocrystalline diamond preparation method |
| CN101157200B (en) * | 2007-11-16 | 2012-11-21 | 河南黄河旋风股份有限公司 | Steel ball matching method of diamond micro mist reshaping ball grinder |
| CN201752860U (en) * | 2010-07-12 | 2011-03-02 | 中南钻石股份有限公司 | Super-hard material ball milling tester |
| CN201871402U (en) * | 2010-12-06 | 2011-06-22 | 河南富耐克超硬材料有限公司 | Milling barrel of planetary ball mill |
| CN202143853U (en) * | 2011-05-30 | 2012-02-15 | 河南省惠丰金刚石有限公司 | Diamond micron powder crushing and screening machine |
| CN204485954U (en) * | 2015-02-04 | 2015-07-22 | 郑州博达超硬材料科技有限公司 | A kind of ball mill and ball grinder thereof |
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