CN110484206B - Cubic boron nitride abrasive surface treatment method - Google Patents
Cubic boron nitride abrasive surface treatment method Download PDFInfo
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- CN110484206B CN110484206B CN201910784014.XA CN201910784014A CN110484206B CN 110484206 B CN110484206 B CN 110484206B CN 201910784014 A CN201910784014 A CN 201910784014A CN 110484206 B CN110484206 B CN 110484206B
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1409—Abrasive particles per se
- C09K3/1418—Abrasive particles per se obtained by division of a mass agglomerated by sintering
Abstract
The invention provides a cubic boron nitride abrasive surface treatment method, which comprises the following steps: high-temperature coarsening, namely adding strong base powder into a cubic boron nitride abrasive, heating to 400-600 ℃, and keeping the temperature for 30-60 min to obtain a coarsened precursor of the cubic boron nitride abrasive, wherein the cubic boron nitride abrasive is purified; and (3) neutralizing the coarsening precursor of the cubic boron nitride abrasive, washing the coarsening precursor of the cubic boron nitride abrasive to be neutral by water, soaking the coarsening precursor of the cubic boron nitride abrasive by an acid solution for neutralization, then washing the precursor of the cubic boron nitride abrasive to be neutral by water, and drying the precursor of the cubic boron nitride abrasive to obtain a coarsened finished product of the cubic boron nitride abrasive. The method mainly utilizes strong base powder to corrode the surface of the cubic boron nitride abrasive at high temperature so as to coarsen the surface of the cubic boron nitride abrasive, thereby achieving the purposes of increasing the surface roughness and reducing the thermal resistance between the cubic boron nitride abrasive and a workpiece interface in the using process.
Description
Technical Field
The invention relates to the technical field of superhard material surface treatment, in particular to a cubic boron nitride abrasive surface treatment method.
Background
Cubic Boron Nitride (CBN) has high hardness, high thermal stability and high chemical inertness, and is an ideal material for the fields of precision processing, grinding and polishing of ferrous metal materials, composite materials, wear-resistant reinforced materials and the like.
Cubic boron nitride is generally used as an abrasive for polishing a workpiece, but because the surface of cubic boron nitride particles is smooth and not sharp, the cubic boron nitride particles have high thermal resistance with a workpiece interface in the use process, and the surface finish of the workpiece needs to be further improved, the problems need to be solved in the application process of the cubic boron nitride abrasive, and the surface treatment technology of the cubic boron nitride abrasive is an effective means for solving the problems.
Disclosure of Invention
In view of the above, the present invention provides a surface treatment method for cubic boron nitride abrasive, which is used to roughen the surface of the cubic boron nitride abrasive, increase the surface roughness of the cubic boron nitride abrasive, and reduce the thermal resistance between the cubic boron nitride abrasive and the workpiece interface during the use process.
Therefore, the invention provides a cubic boron nitride abrasive surface treatment method, which comprises the following steps:
high-temperature coarsening, namely adding strong base powder into a cubic boron nitride abrasive, heating to 400-600 ℃, and keeping the temperature for 30-60 min to obtain a coarsened precursor of the cubic boron nitride abrasive, wherein the cubic boron nitride abrasive is purified;
and (3) neutralizing the coarsening precursor of the cubic boron nitride abrasive, washing the coarsening precursor of the cubic boron nitride abrasive to be neutral by water, soaking the coarsening precursor of the cubic boron nitride abrasive by an acid solution for neutralization, then washing the precursor of the cubic boron nitride abrasive to be neutral by water, and drying the precursor of the cubic boron nitride abrasive to obtain a coarsened finished product of the cubic boron nitride abrasive.
The purpose of the high-temperature coarsening is to coarsen the surface of the cubic boron nitride abrasive under the condition of ensuring the mechanical property of the cubic boron nitride abrasive, so that the high-temperature coarsening temperature of the cubic boron nitride abrasive is limited to 400-600 ℃ in the step. If the high-temperature coarsening temperature of the cubic boron nitride abrasive is lower than 400 ℃, the surface of the cubic boron nitride abrasive basically cannot be corroded, namely the surface of the cubic boron nitride abrasive cannot be coarsened; if the high-temperature coarsening temperature of the cubic boron nitride abrasive is higher than 600 ℃, the surface of the cubic boron nitride abrasive is seriously corroded, so that the loss of the cubic boron nitride abrasive is relatively high, and more importantly, the performances of the cubic boron nitride abrasive, such as impact toughness, thermal impact toughness and the like, are reduced, so that the cubic boron nitride abrasive is not suitable for polishing workpieces any more.
Based on the above, in the high-temperature coarsening step, the mass ratio of the strong base powder to the cubic boron nitride abrasive is 3-8: 1. Preferably, the mass ratio of the strong base powder to the cubic boron nitride abrasive is 3:1, 4:1, 5:1, 6:1, 7:1 or 8:1, and the like.
Based on the above, the strong base powder is sodium hydroxide powder or potassium hydroxide powder.
Based on the above, the acidic solution is a hydrochloric acid solution or a sulfuric acid solution. The main purpose of the neutralization treatment is to remove the strong base remained on the coarsening precursor of the cubic boron nitride abrasive subjected to the high-temperature coarsening treatment, so that the purpose of soaking the coarsening precursor of the cubic boron nitride abrasive subjected to water washing by using the acid solution is also to mainly remove the strong base remained on the surface of the precursor.
Based on the above, the step of neutralizing treatment includes: and cleaning the coarsened precursor of the cubic boron nitride abrasive by using water to be neutral, soaking the coarsened precursor of the cubic boron nitride abrasive by using a hydrochloric acid solution with the mass percentage concentration of 20-38%, cleaning the coarsened precursor of the cubic boron nitride abrasive soaked by the hydrochloric acid solution to be neutral by using water, and drying to obtain the coarsened finished product of the cubic boron nitride abrasive. The method comprises the following steps of neutralizing, treating and drying the cubic boron nitride abrasive coarsening precursor, wherein a hydrochloric acid solution is adopted as an acid solution in the step of neutralizing, so that the treatment cost can be reduced, the hydrochloric acid solution is not easy to remain on the surface of the cubic boron nitride abrasive coarsening precursor, and more importantly, heat cannot be released in the cleaning process of the hydrochloric acid solution, so that the method is safer.
Based on the above, the method for purifying the cubic boron nitride abrasive comprises the following steps: firstly, shaking table selection and impurity removal treatment are carried out on cubic boron nitride sintered particles, then acid-base purification treatment is carried out, and then drying and screening treatment are carried out, so that the cubic boron nitride abrasive is obtained.
Based on the above, the cubic boron nitride abrasive is a single crystal cubic boron nitride abrasive or a polycrystalline cubic boron nitride abrasive.
The surface treatment method of the cubic boron nitride abrasive provided by the invention mainly utilizes strong base powder which can corrode the surface of the cubic boron nitride abrasive subjected to purification treatment at high temperature to coarsen the surface of the cubic boron nitride abrasive, thereby achieving the purposes of increasing the surface roughness of the cubic boron nitride abrasive and reducing the thermal resistance between the cubic boron nitride abrasive and a workpiece interface in the use process of the cubic boron nitride abrasive as the abrasive, and further prolonging the service life of the cubic boron nitride abrasive.
Drawings
Fig. 1 is a photograph of an sem before surface treatment of a cubic boron nitride abrasive according to example 1 of the present invention.
Fig. 2 is a photograph of an electron microscope scanned photograph of the cubic boron nitride abrasive according to example 1 of the present invention after surface treatment.
Fig. 3 is an sem photograph of the cubic boron nitride abrasive according to example 2 of the present invention before surface treatment.
Fig. 4 is a photograph of an sem image of the surface-treated cbn abrasive according to example 2 of the present invention.
Fig. 5 is an sem photograph of the cubic boron nitride abrasive according to example 3 of the present invention before surface treatment.
Fig. 6 is a photograph of an sem image of the surface-treated cbn abrasive according to example 3 of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Example 1
The embodiment of the invention provides a cubic boron nitride abrasive surface treatment method, which comprises the following steps:
the purification treatment comprises the steps of firstly carrying out shaking table selection treatment on the particles of the crushed cubic boron nitride agglomerates so as to remove 95% of impurities in the particles; soaking the raw materials in a sodium hydroxide solution with the concentration of 25% and the temperature of 150-240 ℃ for 4h, then filtering, washing with water to be neutral, and drying; soaking in 23% hydrochloric acid solution for 8h, filtering, washing with water to neutrality, and oven drying to obtain cubic boron nitride abrasive shown in FIG. 1; the main purpose of the step is to purify sintered cubic boron nitride;
high-temperature coarsening, namely placing 1kg of cubic boron nitride abrasive and 3kg of potassium hydroxide powder in a stainless steel container; heating the stainless steel container to 400 ℃ in an electric furnace, and preserving heat at 400 ℃ for 60min to obtain a coarsening precursor of the cubic boron nitride abrasive;
the neutralization treatment comprises the steps of firstly cleaning the coarsening precursor of the cubic boron nitride abrasive by water to be neutral, and then adding 2L of concentrated hydrochloric acid with the concentration of 38% for soaking for 2 h; and (3) washing the coarsened precursor of the cubic boron nitride abrasive soaked by the hydrochloric acid to be neutral by using water, and then drying to obtain a coarsened finished product of the cubic boron nitride abrasive shown in figure 2.
Example 2
The embodiment of the invention provides a cubic boron nitride abrasive surface treatment method, which comprises the following steps:
the purification treatment comprises the steps of firstly carrying out shaking table selection treatment on the particles of the crushed cubic boron nitride agglomerates so as to remove 95% of impurities in the particles; soaking the raw materials in a sodium hydroxide solution with the concentration of 25% and the temperature of 150-240 ℃ for 4h, then filtering, washing with water to be neutral, and drying; soaking in 23% hydrochloric acid solution for 8h, filtering, washing with water to neutrality, and oven drying to obtain cubic boron nitride abrasive material shown in FIG. 3;
high-temperature coarsening, namely placing 1kg of cubic boron nitride grinding material and 5kg of potassium hydroxide powder in a stainless steel container; heating the stainless steel container to 500 ℃ in an electric furnace, and preserving heat for 45min at 500 ℃ to obtain a coarsening precursor of the cubic boron nitride abrasive;
the neutralization treatment comprises the steps of firstly cleaning the coarsening precursor of the cubic boron nitride abrasive by water to be neutral, and then adding 2L of hydrochloric acid with the concentration of 36.5% for soaking for 3 h; and (3) washing the coarsening precursor of the cubic boron nitride abrasive soaked by the hydrochloric acid with water to be neutral, and then drying to obtain a coarsened finished product of the cubic boron nitride abrasive shown in figure 4.
Example 3
The embodiment of the invention provides a cubic boron nitride abrasive surface treatment method, which comprises the following steps:
the purification treatment comprises the steps of firstly carrying out shaking table selection treatment on the particles of the crushed cubic boron nitride agglomerates so as to remove 95% of impurities in the particles; soaking the raw materials in a sodium hydroxide solution with the concentration of 25% and the temperature of 150-240 ℃ for 4h, then filtering, washing with water to be neutral, and drying; soaking the abrasive material in 23% hydrochloric acid solution for 8h, filtering, washing with water to neutrality, and drying to obtain cubic boron nitride abrasive material shown in FIG. 5;
high-temperature coarsening, namely placing 1kg of cubic boron nitride grinding material and 8kg of potassium hydroxide powder in a stainless steel container; heating the stainless steel container to 600 ℃ in an electric furnace, and preserving heat at 600 ℃ for 30min to obtain a coarsened precursor of the cubic boron nitride abrasive;
the neutralization treatment comprises the steps of firstly cleaning the coarsened precursor of the cubic boron nitride abrasive by water to be neutral, and then adding 2L of hydrochloric acid with the concentration of 20% for soaking for 5 hours; and (3) washing the coarsened precursor of the cubic boron nitride abrasive soaked by the hydrochloric acid to be neutral by using water, and then drying to obtain a coarsened finished product of the cubic boron nitride abrasive shown in figure 6.
Performance testing
The cubic boron nitride abrasives before and after the treatment methods provided in the above examples 1 to 3 and comparative examples 1 and 2 were used as samples, and the properties of the samples were tested to further explain the technical solution of the present invention.
The treatment method provided in comparative example 1 is substantially the same as the treatment method provided in example 1, and mainly differs therefrom in that: the roughening temperature in the high-temperature roughening step in comparative example 1 was 300 ℃.
Comparative example 2 provides a treatment method which is substantially the same as the treatment method provided in example 1, with the main difference that: the roughening temperature in the high-temperature roughening step in comparative example 1 was 800 ℃.
1) Surface roughness the surface roughness of the above samples was measured using a canosocan 995 scanner and the results are shown in table 1 below.
TABLE 1 surface roughness table before and after cubic boron nitride abrasive surface treatment
| Sample (I) | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Surface roughness/Ra before treatment | 9.35 | 9.34 | 9.41 | 9.34 | 9.35 |
| Surface roughness/Ra after treatment | 9.95 | 9.87 | 10.03 | 9.35 | 10.24 |
| Rate of change of roughness/%) | 6.42 | 5.67 | 6.59 | 0.1 | 9.52 |
2) The impact toughness (Ti) and thermal shock toughness (Tti) of the above samples were measured using the national current standards, and the results are shown in Table 2 below.
TABLE 2 mechanical Properties of cubic boron nitride abrasives before and after surface treatment
As can be seen from table 1: the surface roughness, impact toughness and thermal shock toughness of comparative example 1 were not greatly changed before and after the surface treatment; the surface roughness change rate of the comparative example 2 reaches more than 9.5%, and the reduction ratio of the impact toughness and the thermal shock toughness after surface treatment is large; the roughness change rate of the embodiment 1-3 is less than 7%, and the impact toughness and the thermal impact toughness are not changed greatly before and after surface treatment; therefore, the coarsening temperature of the surface treatment method of the cubic boron nitride abrasive provided by the embodiment of the invention is limited to be the best at 400-600 ℃, and the cubic boron nitride abrasive has unobvious changes of impact toughness and thermal impact toughness and small loss although the surface roughness is increased before and after the surface treatment, and can still be used as the abrasive.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. A cubic boron nitride abrasive surface treatment method comprises the following steps:
high-temperature coarsening, namely adding strong base powder into a cubic boron nitride abrasive, heating to 400-600 ℃, and keeping the temperature constant for 30-60 min to obtain a coarsening precursor of the cubic boron nitride abrasive, wherein the cubic boron nitride abrasive is purified, and the method for purifying the cubic boron nitride abrasive comprises the following steps: firstly, carrying out shaking table selection and impurity removal treatment on cubic boron nitride sintered particles, then carrying out acid-base purification treatment, and then carrying out drying and screening treatment to obtain the cubic boron nitride abrasive; the mass ratio of the strong base powder to the cubic boron nitride abrasive is 3-8: 1, and the strong base powder is sodium hydroxide powder or potassium hydroxide powder;
and (3) neutralizing the coarsening precursor of the cubic boron nitride abrasive, washing the coarsening precursor of the cubic boron nitride abrasive to be neutral by water, soaking the coarsening precursor of the cubic boron nitride abrasive by an acid solution for neutralization, then washing the precursor of the cubic boron nitride abrasive to be neutral by water, and drying the precursor of the cubic boron nitride abrasive to obtain a coarsened finished product of the cubic boron nitride abrasive.
2. The cubic boron nitride abrasive surface treatment method according to claim 1, wherein the acidic solution is a hydrochloric acid solution or a sulfuric acid solution.
3. A cubic boron nitride abrasive surface treatment method according to claim 2, characterized in that the step of neutralization treatment comprises: and cleaning the coarsened precursor of the cubic boron nitride abrasive by using water to be neutral, soaking the coarsened precursor of the cubic boron nitride abrasive by using a hydrochloric acid solution with the mass percentage concentration of 20-38%, cleaning the coarsened precursor of the cubic boron nitride abrasive soaked by the hydrochloric acid solution to be neutral by using water, and drying to obtain the coarsened finished product of the cubic boron nitride abrasive.
4. The method for surface treatment of a cubic boron nitride abrasive according to claim 1, wherein the cubic boron nitride abrasive is a single crystal cubic boron nitride abrasive or a polycrystalline cubic boron nitride abrasive.
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| CN109455680A (en) * | 2019-01-07 | 2019-03-12 | 郑州中南杰特超硬材料有限公司 | A kind of cubic boron nitride surface roughening treatment method |
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| JP6820657B2 (en) * | 2012-10-03 | 2021-01-27 | ダイヤモンド イノヴェーションズ インコーポレイテッド | Cubic boron nitride particles with a unique morphology |
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| CN109455680A (en) * | 2019-01-07 | 2019-03-12 | 郑州中南杰特超硬材料有限公司 | A kind of cubic boron nitride surface roughening treatment method |
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