A method for preparing high-purity and high-transparency alon ceramics by a solution combustion synthesis method
A technology of solution combustion and synthesis, which is applied in the field of ceramic powder preparation, can solve the problems of powder lattice distortion, unfavorable industrial production, high solid solution temperature, etc., to increase the contact area, improve production efficiency, and increase the particle size of the powder. small effect
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Embodiment 1
[0036] Weigh 1 mol of aluminum nitrate nonahydrate, 0.5 mol of glucose, 0.8 mol of urea, 0.5 mmol of yttrium nitrate, and 0.1 mmol of lanthanum nitrate, and then add an appropriate amount of deionized water to dissolve. The mixed solution is heated and stirred continuously, a large amount of gas is released during the heating process, the gel is continuously expanded and the combustion reaction occurs, and Al is obtained after combustion. 2 O 3 and a mixture of C. will get Al 2 O 3 The mixture of C and C was pulverized and passed through a 200-mesh sieve. The sieved precursor was kept at 1700°C for 1 hour under nitrogen to obtain an AlON product, and the obtained AlON was decarbonized in air at 800°C for 3 hours. The carbon-removed powder is dry-pressed under a pressure of 30MPa, and then cold-isostatically pressed under a pressure of 200MPa. The pressed green body is sintered at 1950 °C for 20 hours under a nitrogen atmosphere in a graphite furnace at atmospheric pressure ...
Embodiment 2
[0038]Weigh 1 mol of aluminum nitrate nonahydrate, 0.4 mol of glucose, 0.9 mol of urea, 0.5 mmol of yttrium nitrate, 0.3 mmol of magnesium nitrate, and 0.1 mmol of calcium nitrate, and then add an appropriate amount of deionized water to dissolve. The mixed solution is heated and stirred continuously, a large amount of gas is released during the heating process, the gel is continuously expanded and a combustion reaction occurs, and Al is obtained after combustion. 2 O 3 and a mixture of C. Al will be obtained 2 O 3 The mixture of C and C was pulverized and passed through a 200-mesh sieve. The sieved precursor was kept at 1680°C for 2 hours under nitrogen to obtain an AlON product, and the obtained AlON was decarbonized in air at 850°C for 3 hours. The carbon-removed powder was dry-pressed under a pressure of 30 MPa, followed by cold isostatic pressing under a pressure of 200 MPa. The pressed green body was sintered at 1900°C for 20 hours under nitrogen atmosphere in a grap...
Embodiment 3
[0040] Weigh 1 mol of aluminum nitrate nonahydrate, 0.5 mol of glucose, 0.8 mol of urea, 0.5 mmol of magnesium nitrate, and 0.1 mmol of boric acid, and then add an appropriate amount of deionized water to dissolve. The mixed solution is heated and stirred continuously, a large amount of gas is released during the heating process, the gel is continuously expanded and a combustion reaction occurs, and Al is obtained after combustion. 2 O 3 and a mixture of C. Al will be obtained 2 O 3 The mixture of C and C was pulverized and passed through a 200-mesh sieve. The sieved precursor was kept at 1700°C for 2 hours under nitrogen to obtain an AlON product, and the obtained AlON was decarbonized in air at 800°C for 5 hours. The carbon-removed powder was dry-pressed under a pressure of 30 MPa, followed by cold isostatic pressing under a pressure of 200 MPa. The pressed green body is sintered at 1900°C for 20 hours under nitrogen atmosphere in a graphite furnace, and AlON transparent...
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