A polycrystalline cubic boron nitride composite sheet with a sandwich layer structure and its preparation method
A cubic boron nitride, polycrystalline cubic technology, applied in coating, metal processing equipment, metal material coating technology and other directions, can solve the problems of insufficient toughness, low service life and efficiency of composite sheets, and prone to cracking. Achieve the effect of reducing interfacial stress, minimizing stress concentration, and improving pressure distribution
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Embodiment 1
[0038] The preparation method of the polycrystalline cubic boron nitride composite sheet with a sandwich layer structure in this embodiment comprises the following steps:
[0039] 1) Substrate purification treatment: first immerse the cemented carbide substrate in an alkaline solution prepared by deionized water and sodium hydroxide at a mass ratio of 1:0.15 and boil for 1 min, then immerse the cemented carbide substrate in a mixture of 98% sulfuric acid and Deionized water was ultrasonically cleaned in a sulfuric acid solution prepared with a volume ratio of 1:4 for 1min, then placed in deionized water and absolute ethanol solution for ultrasonic cleaning for 5min and 8min, and the cemented carbide substrate was taken out and dried with nitrogen, and finally Then put it in a vacuum sintering furnace, the air pressure in the furnace is not more than 5×10 -4 Pa, under the condition of 600°C, fill the furnace with hydrogen with a pressure of 15Mbar to carry out vacuum treatment ...
Embodiment 2
[0049] The preparation method of the polycrystalline cubic boron nitride composite sheet with a sandwich layer structure in this embodiment comprises the following steps:
[0050] 1) Substrate purification treatment: first immerse the cemented carbide substrate in an alkaline solution prepared by deionized water and sodium hydroxide at a mass ratio of 1:0.25 and boil for 3 minutes, then immerse the cemented carbide substrate in a mixture of 98% sulfuric acid and Deionized water was ultrasonically cleaned in a sulfuric acid solution prepared with a volume ratio of 1:5 for 3 minutes, then placed in deionized water and absolute ethanol solution for ultrasonic cleaning for 10 minutes and 12 minutes, and the cemented carbide substrate was taken out and dried with nitrogen, and finally Then put it in a vacuum sintering furnace, the air pressure in the furnace is not more than 5×10 -4 Pa, under the condition of 700°C, fill the furnace with hydrogen gas with a pressure of 20Mbar to ca...
Embodiment 3
[0060] The preparation method of the polycrystalline cubic boron nitride composite sheet with a sandwich layer structure in this embodiment comprises the following steps:
[0061] 1) Substrate purification treatment: first immerse the cemented carbide substrate in an alkaline solution prepared by deionized water and sodium hydroxide at a mass ratio of 1:0.2 and boil for 2 minutes, then immerse the cemented carbide substrate in a mixture of 98% sulfuric acid and Deionized water was ultrasonically cleaned in a sulfuric acid solution prepared with a volume ratio of 1:4.5 for 2 minutes, then placed in deionized water and anhydrous ethanol solution for 7.5 minutes and 10 minutes, and then the cemented carbide substrate was taken out and dried with nitrogen. Finally, it is placed in a vacuum sintering furnace, and the air pressure in the furnace is not more than 5×10 -4 Pa, under the condition of 650°C, fill the furnace with hydrogen with a pressure of 17.5Mbar to carry out vacuum t...
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Abstract
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