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Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof
The invention relates to aluminum oxide coated cubic boron nitride composite powder and a preparation method thereof. The preparation method comprises the following steps of: (1) mixing cubic boron nitride and ethanol according to a certain proportion, adding lauryl sodium sulfate and polyethylene glycol at a certain temperature under a stirring condition, uniformly mixing to obtain a solution, cooling the solution, centrifugally separating the solution, and washing to obtain modified nano c-BN; (2) mixing the modified nano c-BN with absolute ethyl alcohol according to a certain proportion under a stirring condition, uniformly dispersing to obtain a solution A, adding aluminum nitrate into the solution A, and uniformly mixing to obtain a solution B; and (3) slowly adding a mixed solution of ammonia water and ethanol into the solution B obtained in the step (2) until the pH value of the solution is 7-12, continuously stirring until the reaction is finished, standing and aging the obtained product, centrifugally separating the solid product, and heating and dehydrating to obtain the aluminum oxide coated cubic boron nitride composite powder. The preparation method disclosed by the invention has the characteristics of simple process and low cost, the prepared composite powder is good in dispersity, good in coating effect, high in coating rate and uniform in particle size, and thesurface characteristics of cubic boron nitride particles are improved.
本发明涉及一种氧化铝包覆立方氮化硼的复合粉体及其制备方法，包括如下步骤：1)将立方氮化硼与乙醇按一定比例混合，并在一定温度和搅拌条件下加入十二烷基硫酸钠和聚乙二醇，混合均匀后得到溶液，经冷却、离心分离、洗涤得到改性纳米c‑BN；2)将改性纳米c‑BN搅拌条件下与无水乙醇按一定的比例混合，分散均匀，得到A溶液；并将硝酸铝加入到所述A溶液中，混合均匀，得到B溶液；3)将氨水与乙醇的混合液向步骤2）所述B溶液中缓慢加入，至溶液的pH值为7~12，持续搅拌至反应结束，将所得产物静置陈化，将固体产物离心分离后，加热脱水，制得氧化铝包覆立方氮化硼的复合粉体。本发明的制备方法具有工艺简单，成本低廉的特点，所制备的复合粉体不仅分散性好，而且包覆效果好、包覆率高，粒径尺度均匀，改善了立方氮化硼颗粒的表面特性。
Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof
The invention relates to aluminum oxide coated cubic boron nitride composite powder and a preparation method thereof. The preparation method comprises the following steps of: (1) mixing cubic boron nitride and ethanol according to a certain proportion, adding lauryl sodium sulfate and polyethylene glycol at a certain temperature under a stirring condition, uniformly mixing to obtain a solution, cooling the solution, centrifugally separating the solution, and washing to obtain modified nano c-BN; (2) mixing the modified nano c-BN with absolute ethyl alcohol according to a certain proportion under a stirring condition, uniformly dispersing to obtain a solution A, adding aluminum nitrate into the solution A, and uniformly mixing to obtain a solution B; and (3) slowly adding a mixed solution of ammonia water and ethanol into the solution B obtained in the step (2) until the pH value of the solution is 7-12, continuously stirring until the reaction is finished, standing and aging the obtained product, centrifugally separating the solid product, and heating and dehydrating to obtain the aluminum oxide coated cubic boron nitride composite powder. The preparation method disclosed by the invention has the characteristics of simple process and low cost, the prepared composite powder is good in dispersity, good in coating effect, high in coating rate and uniform in particle size, and thesurface characteristics of cubic boron nitride particles are improved.
本发明涉及一种氧化铝包覆立方氮化硼的复合粉体及其制备方法，包括如下步骤：1)将立方氮化硼与乙醇按一定比例混合，并在一定温度和搅拌条件下加入十二烷基硫酸钠和聚乙二醇，混合均匀后得到溶液，经冷却、离心分离、洗涤得到改性纳米c‑BN；2)将改性纳米c‑BN搅拌条件下与无水乙醇按一定的比例混合，分散均匀，得到A溶液；并将硝酸铝加入到所述A溶液中，混合均匀，得到B溶液；3)将氨水与乙醇的混合液向步骤2）所述B溶液中缓慢加入，至溶液的pH值为7~12，持续搅拌至反应结束，将所得产物静置陈化，将固体产物离心分离后，加热脱水，制得氧化铝包覆立方氮化硼的复合粉体。本发明的制备方法具有工艺简单，成本低廉的特点，所制备的复合粉体不仅分散性好，而且包覆效果好、包覆率高，粒径尺度均匀，改善了立方氮化硼颗粒的表面特性。
Aluminum oxide coated cubic boron nitride composite powder and preparation method thereof
一种氧化铝包覆立方氮化硼的复合粉体及其制备方法
FANG BIN (author) / LI DEPENG (author) / YUAN ZHONGXING (author)
2020-10-30
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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