Method for preparing HfC powder at low temperature by carbothermic method
A reduction method and low temperature technology, applied in the field of structural ceramics, can solve the problems of poor mixing uniformity and low purity of HfC ceramic powder, and achieve the effects of short time consumption, low raw material cost and simple process
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Embodiment 1
[0024] With sucrose as carbon source, hafnium oxide (HfO 2 ) as a hafnium source;
[0025] 1) Weigh 100g HfO 2 Powder, its purity is 99.9wt.%, average particle size is 80nm, joins in 30ml water, ultrasonic vibration disperses 0.5h;
[0026] 2) Weigh 81.4g of sucrose and add it to 20ml of water, stir to make it evenly mixed, then add it to the solution obtained in step 1), heat while magnetically stirring, the heating temperature is 120°C, and the heating time is 2h, and a well-mixed reaction is obtained thing;
[0027] 3) Put the reactant obtained in step 2) into a graphite crucible, and then put the graphite crucible into a high-purity argon-protected heat treatment furnace for heating. The heating program is to heat up to 1600°C at a heating rate of 10°C / min 1h, then cool down to room temperature with the furnace, and then grind to obtain the powder material; the X-ray diffraction pattern of the obtained powder material is as follows figure 1 As shown, its scanning elect...
Embodiment 2
[0029] With sucrose as carbon source, hafnium oxide (HfO 2 ) as a hafnium source;
[0030] 1) Weigh 100g HfO 2 Powder, its purity is 99.9wt.%, average particle diameter is 60nm, joins in 30ml water, ultrasonic vibration disperses 1h;
[0031] 2) Weigh 108.4g of sucrose and add it to 20ml of water, stir to make it evenly mixed, then add it to the solution obtained in step 1), and heat it with magnetic stirring at the same time, the heating temperature is 150°C, and the heating time is 0.5h to obtain a uniform Reactant;
[0032] 3) Put the reactant obtained in step 2) into a graphite crucible, and then put the graphite crucible into a high-purity argon-protected heat treatment furnace for heating. The heating program is to heat up to 1500°C at a heating rate of 10°C / min 0.5h, then cooled to room temperature with the furnace, and then ground to obtain hafnium carbide powder.
Embodiment 3
[0034] With sucrose as carbon source, hafnium oxide (HfO 2 ) as a hafnium source;
[0035] 1) Weigh 100g HfO 2 Powder, its purity is 99.9wt.%, average particle diameter is 100nm, joins in 30ml water, ultrasonic vibration disperses 1h;
[0036] 2) Weigh 122.1g of sucrose and add it to 25ml of water, stir to make it evenly mixed, then add it to the solution obtained in step 1), heat while magnetically stirring, the heating temperature is 160°C, and the heating time is 0.5h, to obtain a well-mixed Reactant;
[0037] 3) Put the reactant obtained in step 2) into a graphite crucible, and then put the graphite crucible into a high-purity argon-protected heat treatment furnace for heating. The heating program is to heat up to 1300°C at a heating rate of 10°C / min 2h, then cooled to room temperature with the furnace, and then ground to obtain hafnium carbide powder.
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