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The invention provides a preparation method of reactive sintering silicon carbide ceramic granulation powder, which comprises the following steps: (1) preparing premixed liquid: dissolving an initial adhesive, a ceramic dry pressing adhesive, a lubricant, a pressing aid and a dispersing agent in deionized water, and stirring to uniformly mix the premixed liquid; (2) mixing and ball-milling: putting the premixed liquid, carbon black and graphite into a ball-milling tank, carrying out primary ball-milling, then adding silicon carbide powder, and carrying out ball-milling again to obtain silicon carbide/carbon black stable slurry with a certain solid-phase fraction; (3) vacuum degassing: degassing the slurry for 15 +/-5 minutes under the vacuum degree of-0.09 MPa, and removing bubbles in the slurry; and (4) pressing the prepared silicon carbide/carbon black stable slurry into a spray granulation tower for granulation, and adjusting the granulation particle size to prepare granulation powder with good fluidity. Graphite (solid lubricant) is added into the powder particles, and in the dry pressing forming process, silicon carbide particles can slide towards a small-density area, so that the density of a formed body is more uniform, and the problems of unstable performance and low yield of sintered silicon carbide ceramic are solved.
本发明提供一种反应烧结碳化硅陶瓷造粒粉料的制备方法，包括以下步骤，（1）配置预混液：将初粘剂、陶瓷干压粘接剂、润滑剂、助压剂、分散剂溶解于去离子水中，搅拌，使预混液混合均匀；（2）混合球磨：将预混液、炭黑和石墨装入球磨罐中，初次球磨后，再加入碳化硅粉，再次球磨，得到一定固相分数的碳化硅/炭黑稳定浆料；（3）真空除气：浆料在真空度为‑0.09MPa下除气15±5min，排除浆料中的气泡；（4）将制备好的碳化硅/炭黑稳定浆料压入喷雾造粒塔进行造粒，调整好造粒粒径，制得到流动性良好的造粒粉料。粒粉颗粒中添加有石墨（固体润滑剂），在干压成形过程中，碳化硅颗粒能够向密度小的区域滑动，使成形体的密度更加均匀，以解决碳化硅陶瓷烧结后的性能不稳定和成品率不高的难题。
The invention provides a preparation method of reactive sintering silicon carbide ceramic granulation powder, which comprises the following steps: (1) preparing premixed liquid: dissolving an initial adhesive, a ceramic dry pressing adhesive, a lubricant, a pressing aid and a dispersing agent in deionized water, and stirring to uniformly mix the premixed liquid; (2) mixing and ball-milling: putting the premixed liquid, carbon black and graphite into a ball-milling tank, carrying out primary ball-milling, then adding silicon carbide powder, and carrying out ball-milling again to obtain silicon carbide/carbon black stable slurry with a certain solid-phase fraction; (3) vacuum degassing: degassing the slurry for 15 +/-5 minutes under the vacuum degree of-0.09 MPa, and removing bubbles in the slurry; and (4) pressing the prepared silicon carbide/carbon black stable slurry into a spray granulation tower for granulation, and adjusting the granulation particle size to prepare granulation powder with good fluidity. Graphite (solid lubricant) is added into the powder particles, and in the dry pressing forming process, silicon carbide particles can slide towards a small-density area, so that the density of a formed body is more uniform, and the problems of unstable performance and low yield of sintered silicon carbide ceramic are solved.
本发明提供一种反应烧结碳化硅陶瓷造粒粉料的制备方法，包括以下步骤，（1）配置预混液：将初粘剂、陶瓷干压粘接剂、润滑剂、助压剂、分散剂溶解于去离子水中，搅拌，使预混液混合均匀；（2）混合球磨：将预混液、炭黑和石墨装入球磨罐中，初次球磨后，再加入碳化硅粉，再次球磨，得到一定固相分数的碳化硅/炭黑稳定浆料；（3）真空除气：浆料在真空度为‑0.09MPa下除气15±5min，排除浆料中的气泡；（4）将制备好的碳化硅/炭黑稳定浆料压入喷雾造粒塔进行造粒，调整好造粒粒径，制得到流动性良好的造粒粉料。粒粉颗粒中添加有石墨（固体润滑剂），在干压成形过程中，碳化硅颗粒能够向密度小的区域滑动，使成形体的密度更加均匀，以解决碳化硅陶瓷烧结后的性能不稳定和成品率不高的难题。
Preparation method of reactive sintering silicon carbide ceramic granulation powder
一种反应烧结碳化硅陶瓷造粒粉料的制备方法
HE SIYI (author)
2023-04-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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