Is the hardness of precision ceramics good?
2022 03/02
Regarding the relationship between ceramics and hardness, there are two different opinions today. The first opinion is that he is the inventor of papermaking, and the second opinion is that paper was used to replace slips in the early Western Han Dynasty, and Cai Lun was just an innovator of Silicon Nitride Parts papermaking. It seems that the second opinion is correct, because as early as the early Western Han Dynasty 200 years ago, Cai Lun had already used hemp paper for writing. Cai Lun's contribution was to organize and promote the production and meticulous work of high-grade hemp paper, and to promote the development of papermaking. Vellum is made from bark fibers, which is more technically difficult than hemp paper. Cai Lun's contribution was to develop vellum production in the Eastern Han Dynasty. Hemp paper and vellum paper have been the two pillars of Chinese Silicon Nitride Parts paper for 1200 years since the Han Dynasty, and Chinese culture has developed rapidly due to the supply of these two types of paper. As early as 1800 years ago, Cai Lun, the inventor of papermaking, used tree skin (that is, bark), hemp head (hemp scrap), open cloth (rags), broken fish nets, etc. as raw materials to make "Caihou paper". It was dedicated to Emperor Hedi of the Eastern Han Dynasty in AD 105 and was highly praised. The invention of papermaking has made great contributions to the progress of civilization in China and the world. In the early days of the invention of papermaking, the raw materials for papermaking were mainly rags and bark. The rags at that time It is mainly hemp fiber, and the varieties are mainly ramie and hemp. It is said that cotton in our country was introduced in the early Eastern Han Dynasty and was introduced from India at the same time as Buddhism, so it should be later used for textiles. In addition, the bark used at that time It is mainly textured skin (ie, mulberry skin), which Silicon Nitride Parts was once known as "Mr. Chu" for wolfberry paper.From the 3rd to the 5th century AD, the variety, output and quality of paper increased and improved, and the source of papermaking raw materials was wider. History books have mentioned the names of some paper types related to raw materials during this period, such as white hemp paper and jute paper for writing scriptures, vellum paper made of wolf skin, rattan paper made of rattan fiber, and mulberry root made of mulberry. Paper, straw paper, etc. From this point of view, during the Wei, Jin, Southern and Northern Dynasties, hemp, wolfberry, mulberry, rattan fiber, and straw were widely used as raw materials for papermaking.