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Preparation method of blocky boron nitride aerogel based on combination of freeze drying method and tubular furnace high-temperature heating method
The invention discloses a preparation method of blocky boron nitride aerogel based on combination of a freeze drying method and a tubular furnace high-temperature heating method. The preparation method comprises the following steps: 1. weighing boric acid and melamine, and adding ultrapure water to form a melamine-boric acid hydrogel precursor; 2, putting the melamine-boric acid hydrogel precursorinto a water bath kettle, carrying out heat preservation to obtain a transparent solution, carrying out ultrasonic treatment, and cooling to room temperature to obtain melamine-boric acid hydrogel; 3, carrying out freeze drying on the melamine-boric acid hydrogel to obtain blocky boron nitride xerogel; and 4, introducing nitrogen-hydrogen mixed gas into a tubular furnace, putting the blocky boronnitride xerogel on a corundum boat, pushing the corundum boat to a central high-temperature area of the tubular furnace for heating, and taking out the corundum boat after the corundum boat is cooledto room temperature to obtain the boron nitride aerogel. The blocky boron nitride aerogel prepared by the preparation method is excellent in morphology, light in weight, low in density, simple and feasible in method, simple and cheap in used experimental equipment and convenient in experimental process.
本发明公开了一种基于冷冻干燥法和管式炉高温加热法相结合的块状氮化硼气凝胶的制备方法，所述方法包括如下步骤：一、称取硼酸和三聚氰胺，加入超纯水，形成三聚氰胺‑硼酸水凝胶前驱体；二、将三聚氰胺‑硼酸水凝胶前驱体放入水浴锅中保温，得到透明溶液，然后超声处理后冷却至室温，得到三聚氰胺‑硼酸水凝胶；三、将三聚氰胺‑硼酸水凝胶冷冻干燥，获得块状氮化硼干凝胶；四、管式炉通氮氢混合气体，将块状氮化硼干凝胶放到刚玉舟上，将刚玉舟推到管式炉的中央高温区加热，待其冷却到室温后取出，获得氮化硼气凝胶。本发明制备的块状氮化硼气凝胶形貌优良，质量轻，密度小，方法简单易行，所用实验设备简单、廉价，实验过程方便。
Preparation method of blocky boron nitride aerogel based on combination of freeze drying method and tubular furnace high-temperature heating method
The invention discloses a preparation method of blocky boron nitride aerogel based on combination of a freeze drying method and a tubular furnace high-temperature heating method. The preparation method comprises the following steps: 1. weighing boric acid and melamine, and adding ultrapure water to form a melamine-boric acid hydrogel precursor; 2, putting the melamine-boric acid hydrogel precursorinto a water bath kettle, carrying out heat preservation to obtain a transparent solution, carrying out ultrasonic treatment, and cooling to room temperature to obtain melamine-boric acid hydrogel; 3, carrying out freeze drying on the melamine-boric acid hydrogel to obtain blocky boron nitride xerogel; and 4, introducing nitrogen-hydrogen mixed gas into a tubular furnace, putting the blocky boronnitride xerogel on a corundum boat, pushing the corundum boat to a central high-temperature area of the tubular furnace for heating, and taking out the corundum boat after the corundum boat is cooledto room temperature to obtain the boron nitride aerogel. The blocky boron nitride aerogel prepared by the preparation method is excellent in morphology, light in weight, low in density, simple and feasible in method, simple and cheap in used experimental equipment and convenient in experimental process.
本发明公开了一种基于冷冻干燥法和管式炉高温加热法相结合的块状氮化硼气凝胶的制备方法，所述方法包括如下步骤：一、称取硼酸和三聚氰胺，加入超纯水，形成三聚氰胺‑硼酸水凝胶前驱体；二、将三聚氰胺‑硼酸水凝胶前驱体放入水浴锅中保温，得到透明溶液，然后超声处理后冷却至室温，得到三聚氰胺‑硼酸水凝胶；三、将三聚氰胺‑硼酸水凝胶冷冻干燥，获得块状氮化硼干凝胶；四、管式炉通氮氢混合气体，将块状氮化硼干凝胶放到刚玉舟上，将刚玉舟推到管式炉的中央高温区加热，待其冷却到室温后取出，获得氮化硼气凝胶。本发明制备的块状氮化硼气凝胶形貌优良，质量轻，密度小，方法简单易行，所用实验设备简单、廉价，实验过程方便。
Preparation method of blocky boron nitride aerogel based on combination of freeze drying method and tubular furnace high-temperature heating method
基于冷冻干燥法和管式炉高温加热法相结合的块状氮化硼气凝胶的制备方法
LI LING (author) / JIANG XIANGQIAN (author)
2020-08-14
Patent
Electronic Resource
Chinese
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