CN112608717A - Coarse grinding fluid and preparation method thereof - Google Patents
Coarse grinding fluid and preparation method thereof Download PDFInfo
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Abstract
The invention provides a coarse grinding fluid and a preparation method thereof, wherein the coarse grinding fluid comprises the following components in percentage by mass: 30-40% of boron carbide powder, 0.3-0.8% of suspension anti-settling agent, 1-5% of dispersion stabilizer, 1-10% of pH regulator, 1-5% of wetting agent, 1-4% of chelating agent and deionized water as solvent; the suspension anti-settling agent comprises lithium magnesium silicate and/or sodium magnesium silicate; the content of the boron carbide powder with the particle size of less than 150 mu m accounts for 50 percent of the total amount of the boron carbide powder, the content of the boron carbide powder with the particle size of more than 150 mu m accounts for 50 percent of the total amount of the boron carbide powder, and the content of the boron carbide powder with the particle size of less than 40 mu m accounts for 3 percent of the total amount of the boron carbide powder. The coarse grinding fluid has the advantages of long service life, simple preparation method and low cost, and the cutting rate of the coarse grinding fluid on zirconia ceramics reaches 1c/min, and the surface roughness is about 15.35 nm.
Description
Technical Field
The invention relates to the technical field of coarse grinding fluid, and particularly relates to coarse grinding fluid and a preparation method thereof.
Background
Zirconia ceramic with molecular formula of ZrO2The high-hardness high-strength high-hardness high-strength wear-resistant high-strength. At present, the processing cost of the zirconia ceramics is high, especially in the rough grinding section. At present, in the industry, a grinding machine is mostly used for coarse grinding of zirconia ceramics and matched with cooling liquid or a grinding pad is matched with brown fused alumina grinding materials and cooling liquid, but the products processed by the grinding machine have more vibration lines, so that the Ra value of the surface roughness of the products is high; polishing padWhen the grinding material is matched with brown corundum grinding materials, the grinding pad has high loss, the service life of the grinding pad is shortened, and the processing cost is high.
In summary, a rough grinding fluid and a preparation method thereof are urgently needed to solve the problems of high surface roughness Ra value and high processing cost of the zirconia ceramic product polished by the prior polishing technology.
Disclosure of Invention
The invention aims to provide a coarse grinding fluid, which has the following specific technical scheme:
the coarse grinding fluid comprises the following components in percentage by mass: 30-40% of boron carbide powder, 0.3-0.8% of suspension anti-settling agent, 1-5% of dispersion stabilizer, 1-10% of pH regulator, 1-5% of wetting agent, 1-4% of chelating agent and deionized water as solvent; the suspension anti-settling agent comprises lithium magnesium silicate and/or sodium magnesium silicate.
Preferably, the content of the boron carbide powder with the particle size of less than 150 μm accounts for 50% of the total amount of the boron carbide powder, the content of the boron carbide powder with the particle size of more than 150 μm accounts for 50% of the total amount of the boron carbide powder, and the content of the boron carbide powder with the particle size of less than 40 μm accounts for 3% of the total amount of the boron carbide powder.
Preferably, the dispersion stabilizer includes one or more of fumed silica, sodium polyacrylate, sodium hexametaphosphate, tetrasodium ethylenediaminetetraacetate, polyethylene glycol 400, and polyethylene glycol 200.
Preferably, the pH adjusting agent comprises one or more of diethanolamine, triethanolamine, potassium hydroxide, sodium hydroxide, and tetramethylammonium hydroxide.
Preferably, the humectant comprises one or more of propylene glycol, glycerol and dimethyl sulfoxide.
Preferably, the chelating agent comprises one or more of ethylenediamine, ethylenediamine tetraacetic acid and sodium gluconate.
The second purpose of the invention is to provide a preparation method of the coarse grinding fluid, which comprises the following specific technical scheme:
a preparation method of a coarse grinding fluid comprises the following steps:
step 1, preparing a suspension system, specifically, adding deionized water into a reaction kettle under mechanical stirring, keeping stirring for 5-10min, adding the suspension anti-settling agent, mechanically stirring for 30-60min, then blanking, and standing for 12-24h to prepare the suspension system;
step 2, preparing a mixed system, specifically, adding deionized water into a reaction kettle, adding a dispersing agent, a wetting agent and a chelating agent under mechanical stirring, stirring until the materials are fully dissolved, and then blanking the materials into the suspension system to be uniformly mixed to prepare the mixed system;
and 3, preparing coarse grinding fluid, specifically, adding the boron carbide powder into the mixed system, mechanically stirring for 40-60min to obtain a premixed system, adding the pH regulator, regulating the pH value of the premixed system to 9-11, transferring the premixed system into an ultrasonic generator, dispersing for 20-40min at the dispersion frequency of 30-50KHz, and preparing the coarse grinding fluid.
Preferably, the mechanical stirring rate in step 1 and step 2 is 300-500 rpm.
Preferably, the mechanical stirring rate in step 3 is 1200-1400 rpm.
Preferably, the viscosity of the coarse grinding fluid is 550-580mPa & s, and the density is 1.174-1.275g/cm3。
The technical scheme of the invention has the following beneficial effects:
(1) in the invention, 0.3-0.8 percent of suspension anti-settling agent is added into the coarse grinding fluid, which can ensure the excellent suspension stability of boron carbide powder, the coarse grinding fluid prepared by combining other components in the coarse grinding fluid has good dispersibility and stable performance, the TTV (Total thickness variation) of a coarse grinding product is small, the coarse grinding efficiency is higher, and the whole system has good antirust effect on a mill cast iron disc. The rough grinding fluid is matched with a 16B grinding machine and a cast iron disc to process the zirconia ceramics, the process of a grinding pad and a grinding machine is avoided in the process aspect, the cutting rate of the zirconia ceramics reaches 1c/min, the surface roughness is about 15.35nm, the surface roughness of the zirconia ceramics is effectively improved, the rough grinding removal rate is obviously improved, and the rough grinding and thinning effects are good. The rough grinding fluid has the advantages of long service life, simple preparation method and low cost.
(2) According to the invention, the content of the boron carbide powder with the particle size of less than 150 μm accounts for 50% of the total amount of the boron carbide powder, the content of the boron carbide powder with the particle size of more than 150 μm accounts for 50% of the total amount of the boron carbide powder, wherein the content of the boron carbide powder with the particle size of less than 40 μm accounts for 3% of the total amount of the boron carbide powder, and compared with the existing boron carbide powder, the proportion of the boron carbide powder with the particle size of less than 40 μm (mainly 30 μm) is reduced, so that the processing effect is good. If boron carbide powder with smaller grain size, such as commonly used 320-mesh boron carbide powder on the market, is used for rough grinding of sapphire, the former procedure of the rough grinding of sapphire is subjected to linear cutting, the removal amount requirement is not too high generally, the requirement can be met by using conventional 320-mesh boron carbide for several minutes or even about one minute, the suspension property requirement on the whole rough grinding liquid system is not so high, the rough grinding and thinning effect on zirconia ceramics is too poor, 40C (1C is 10 mu m) is removed by processing the first grinding, 110min is required, and the polishing efficiency is seriously reduced; if the boron carbide powder with the overlarge particle size is used, the removal amount is overlarge, and the flatness is not easy to ensure. Therefore, in the selection process of the particle size of the boron carbide powder, the invention carries out a plurality of on-machine verifications to obtain the optimal particle size of more than 40 μm. In addition, the selection of the particle size range can achieve the cutting rate of the zirconia ceramic to be 1c/min, the surface roughness is about 15.35nm, the surface roughness of the zirconia ceramic is effectively improved, the coarse grinding removal rate is obviously improved, and the fine coarse grinding and thinning effects are achieved.
(3) The order of addition of the components in the preparation process according to the invention is important. The specific reasons are as follows: and (2) adding deionized water into the reaction kettle in the suspension system prepared in the step (1) under mechanical stirring, keeping stirring for 5-10min, adding the suspension anti-settling agent, mechanically stirring for 30-60min, then discharging, and standing for 12-24h to prepare the suspension system. The suspension anti-settling agent comprises lithium magnesium silicate and/or sodium magnesium silicate. The magnesium lithium silicate and the magnesium sodium silicate belong to gel particles, the crystal structure unit of the gel particles is a tiny flake with the thickness of nanometer, and the surface of the flake is covered with exchangeable cations, wherein the exchangeable cations are mainly Na+. When the magnesium lithium silicate and the magnesium sodium silicate are usedWhen the gel particles are mixed with water, the water is mixed with Na+The contact is adsorbed to the surface of the sheet, spreading the gel particles along the sheet, at which point the gel particles expand rapidly until the sheet separates. Because the surface of the slice is negatively charged and the end surface is positively charged, the end surface of the separated slice is attracted to the surface of another slice, thereby rapidly forming a colloid structure of a three-dimensional space and increasing the viscosity of the suspension system. The lithium magnesium silicate and/or sodium magnesium silicate gel particles in the suspension are actually multiple individual platelets separated by a single layer of water molecules, the more the particles are separated into individual platelets, the stronger the colloidal structure, the greater the viscosity and yield value, and the more pronounced the thickening effect. If lithium magnesium silicate or sodium magnesium silicate alone is added directly to the solution consisting of deionized water, dispersant, wetting agent and chelating agent in step 2, or in step 3, flocculation or low viscosity structures are caused, and suspension effects cannot be maximized. The suspension system prepared by the method has high viscosity through the step 1, so that the components added in the subsequent steps can be uniformly dispersed, particularly the boron carbide powder in the step 3, the performance of the coarse grinding fluid prepared by the method is stable, and the coarse grinding efficiency is improved.
(4) The preparation method disclosed by the invention is simple in steps, easy to control parameters, convenient to operate and high in practicability.
(5) The viscosity of the coarse grinding fluid is 550-580mPa & s, the density is 1.174-1.275g/cm3, the stability of the coarse grinding fluid is ensured, and the coarse grinding efficiency is improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to specific embodiments.
Detailed Description
The invention is described in detail below with reference to examples, but can be implemented in many different ways as defined and covered by the claims.
Example 1:
the coarse grinding fluid comprises the following components in percentage by mass: 33.3% of boron carbide powder, 0.7% of suspension anti-settling agent, 2.9% of dispersion stabilizer, 2.7% of pH regulator, 2.7% of wetting agent, 1.3% of chelating agent and deionized water as solvent; the suspension anti-settling agent is lithium magnesium silicate.
The content of the boron carbide powder with the particle size of less than 150 mu m accounts for 50% of the total amount of the boron carbide powder, the content of the boron carbide powder with the particle size of more than 150 mu m accounts for 50% of the total amount of the boron carbide powder, and the content of the boron carbide powder with the particle size of less than 40 mu m accounts for 3% of the total amount of the boron carbide powder.
The dispersion stabilizer comprises fumed silica and sodium polyacrylate, wherein the dosage of the fumed silica is 2.7%, and the dosage of the sodium polyacrylate is 0.2%.
The pH regulator is triethanolamine.
The wetting agent is propylene glycol.
The chelating agent is ethylenediamine tetraacetic acid.
A preparation method of the coarse grinding fluid comprises the following steps:
step 1, preparing a suspension system, specifically, under mechanical stirring, adding 36kg of deionized water into a clean and dry 60L reaction kettle, keeping stirring for 5-10min, adding 4kg of magnesium lithium silicate, mechanically stirring for 30-60min, then blanking, and standing for 16h to prepare the suspension system;
step 2, preparing a mixed system, specifically, adding 240kg of deionized water into a clean and dry 600L reaction kettle, adding 16kg of fumed silica, 1.2kg of sodium polyacrylate, 16kg of propylene glycol and 8kg of ethylene diamine tetraacetic acid under mechanical stirring, mechanically stirring until the materials are fully dissolved, then blanking the materials into the suspension system, and uniformly mixing the materials to obtain the mixed system;
and 3, preparing coarse grinding fluid, specifically, adding 200kg of boron carbide powder into the mixed system, stirring for 60min to obtain a premixed system, adding 16kg of triethanolamine, stirring for 20min, adjusting the pH value of the premixed system to 9-11, transferring the premixed system into an ultrasonic generator, dispersing at the frequency of 40KHz, and performing ultrasonic dispersion for 30min to obtain the coarse grinding fluid.
The mechanical stirring rate in both step 1 and step 2 was 400rpm, ensuring rapid mixing.
The mechanical stirring rate in step 3 was 1250rpm, ensuring rapid mixing.
The viscosity of the coarse grinding fluid is 550-580mPa & s, and the density is 1.174-1.275g/cm3。
The invention also provides examples 2-7 and comparative examples 1-3 on the basis of the example 1, wherein the components and the mass percentages of the rough grinding fluid of the examples 2-7 are different from those of the example 1, and the specific reference is made to the table 1. Comparative example 1 differs from example 1 in that the amount of suspension anti-settling agent added is zero. Comparative example 2 differs from example 1 in that the addition amount of the suspension anti-settling agent was 0.2%. Comparative example 3 differs from example 1 in that the addition amount of the suspension anti-settling agent was 0.9%.
The kibbles prepared from examples 1-7 and comparative examples 1-3 were used with a 16B mill and cast iron pan with the following experimental conditions:
processing a machine table: 16B flat grinding machine
Grinding disc material: cast iron disc
Processing pressure: 180KG
The rotating speed of the upper disc is as follows: 24rpm
Rotating speed of a lower disc: 32rpm
Processing a product: zirconia ceramic guard ring clamp
Processing time: 40min
Processing quantity: 25pcs
After coarse grinding, cleaning and drying the product.
TABLE 1
Randomly selecting 10pcs of the 25pcs processed products of the example 1, measuring the thickness of the products before and after processing by using a height gauge and recording the thickness so as to obtain the removal amount and the removal rate, wherein the data result is shown in a table 2; two points were randomly selected on each piece of the picked work product, and the roughness after work was measured with an OMM roughness tester, and the data results are shown in Table 3.
TABLE 2
TABLE 3
The average removal rates and the Ra average values for the products of examples 2-7 and comparative examples 1-3 were obtained using the treatment of example 1, and the data are shown in table 4.
TABLE 4
| Serial number | Average removal rate μm/min | Average Ra/nm of product |
| Example 1 | 10 | 15.35 |
| Example 2 | 9.98 | 15.28 |
| Example 3 | 10.1 | 15.32 |
| Example 4 | 9.99 | 15.31 |
| Example 5 | 10.08 | 15.29 |
| Example 6 | 10.07 | 15.36 |
| Example 7 | 10.05 | 15.38 |
| Comparative example 1 | 5.04 | 15.37 |
| Comparative example 2 | 12.06 | 15.38 |
| Comparative example 3 | 10.05 | 15.36 |
As shown in the data in tables 1-4, the rough grinding fluid is matched with a 16B grinding machine and a cast iron disc to process a zirconia ceramic guard ring clamp, a proper particle size range is selected in the aspect of selection and optimization of particle size, the process of a grinding pad and a grinding machine is avoided in the aspect of process, the cutting rate of zirconia ceramic reaches 10 mu m/min, the surface roughness is about 15.35nm, the surface roughness of the zirconia ceramic guard ring clamp is effectively improved, the rough grinding removal rate is obviously improved, and the rough grinding and thinning effects are good. The rough grinding fluid has the advantages of long service life, simple preparation method and low cost. Compared with the embodiment 1, when the addition amount of the suspension anti-settling agent adopted in the comparative example 1 is zero, the boron carbide powder is quickly settled, and the removal rate is obviously reduced after grinding for several times; comparative example 2 when the addition amount of the suspension anti-settling agent is 0.2%, part of boron carbide powder is hardened and settled, the boron carbide powder cannot be completely utilized, and the removal rate is slow; in comparative example 3, when the addition amount of the floating anti-settling agent is 0.9%, the removal rate is in a normal range, and the addition amount of the suspension anti-settling agent is selected to be most suitable in a range of 0.3-0.8% in combination with cost consideration.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The coarse grinding fluid is characterized by comprising the following components in percentage by mass: 30-40% of boron carbide powder, 0.3-0.8% of suspension anti-settling agent, 1-5% of dispersion stabilizer, 1-10% of pH regulator, 1-5% of wetting agent, 1-4% of chelating agent and deionized water as solvent; the suspension anti-settling agent comprises lithium magnesium silicate and/or sodium magnesium silicate.
2. The coarse grinding fluid according to claim 1, wherein the content of the boron carbide powder with the particle size of less than 150 μm is 50% of the total amount of the boron carbide powder, and the content of the boron carbide powder with the particle size of more than 150 μm is 50% of the total amount of the boron carbide powder, and wherein the content of the boron carbide powder with the particle size of less than 40 μm is 3% of the total amount of the boron carbide powder.
3. The kibble of claim 1, wherein the dispersion stabilizer comprises one or more of fumed silica, sodium polyacrylate, sodium hexametaphosphate, tetrasodium ethylenediaminetetraacetic acid, polyethylene glycol 400, polyethylene glycol 200.
4. The kibble of claim 1, wherein the pH adjuster comprises one or more of diethanolamine, triethanolamine, potassium hydroxide, sodium hydroxide, and tetramethylammonium hydroxide.
5. The kibble of claim 1, wherein the wetting agent comprises one or more of propylene glycol, glycerol, dimethyl sulfoxide.
6. The kibble of claim 1, wherein the chelating agent comprises one or more of ethylenediamine, ethylenediamine tetraacetic acid, and sodium gluconate.
7. A method for preparing the coarse grinding fluid according to any one of claims 1 to 6, comprising the steps of:
step 1, preparing a suspension system, specifically, adding deionized water into a reaction kettle under mechanical stirring, keeping stirring for 5-10min, adding the suspension anti-settling agent, mechanically stirring for 30-60min, then blanking, and standing for 12-24h to prepare the suspension system;
step 2, preparing a mixed system, specifically, adding deionized water into a reaction kettle, adding a dispersing agent, a wetting agent and a chelating agent under mechanical stirring, stirring until the materials are fully dissolved, and then blanking the materials into the suspension system to be uniformly mixed to prepare the mixed system;
and 3, preparing coarse grinding fluid, specifically, adding the boron carbide powder into the mixed system, mechanically stirring for 40-60min to obtain a premixed system, adding the pH regulator, regulating the pH value of the premixed system to 9-11, transferring the premixed system into an ultrasonic generator, dispersing for 20-40min at the dispersion frequency of 30-50KHz, and preparing the coarse grinding fluid.
8. The method as claimed in claim 7, wherein the mechanical stirring rate in step 1 and step 2 is 300-500 rpm.
9. The method as claimed in claim 7, wherein the mechanical stirring rate in step 3 is 1200-1400 rpm.
10. The method as claimed in claim 7, wherein the viscosity of the crude grinding fluid is 550-580 mPa-s, and the density is 1.174-1.275g/cm3。
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| CN112658974A (en) * | 2020-12-17 | 2021-04-16 | 江苏集萃精凯高端装备技术有限公司 | YAG wafer grinding method |
| CN115627153A (en) * | 2022-10-19 | 2023-01-20 | 中国兵器科学研究院宁波分院 | Water-based grinding fluid for boron carbide ceramic balls and preparation method thereof |
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