Precursory body changes carborundum pottery and porcelain base composite material (CMCs) main application is had at preparation it is high temperature resistant, good to fight oxidation, wearability, heat expands rate is small, electric good, hardness mixes thermal conductivity high anti-corrosive those who wait for superior performance, and but the material of high-powered pottery and porcelain that close only measure shapes and fiber enhance radical of pottery and porcelain composite material; already was applied extensively at high-end science and technology and domain of national defence military affairs at present, if dimensional remote sensing is become,quantify engine of the structural member that prop up, aerospace gently like optical system to heat up end component, can repeat use spaceflight locomotive implement heat defends material, hypersonic speed is carried advance a system to wait. In civil domain, precursory body changes structural material to also reflect its stage by stage huge economy value and the function that cannot supersede, like the modern carriage system such as plane, Gao Tie, car undercarriage of Buddhist templeput on the brakes, high temperature lights turbine to heat up gas of upright component, high temperature more than heat reclaims, industrial dust filters, anti-corrosive but system of carrier of second birth activator, large high temperature heats furnace of high temperature of component, metallurgy uses carbon to cover etc. The development that works as confluence of the army and the people is advanced, precursory body changes technology of preparation of material of high-powered structure pottery and porcelain will more hasten green is changed, low cost is changed, its product will pervade each aspects of economic society system more extensively, urge action to what economy grows will bigger and bigger. The precursory aspect of preparation CMCs matrix is crucial, see from technological process, good precursory system should hold concurrently " 3 low " (cross-linking of low viscosity, low temperature, low contractive) , "2 without " (without foreign matter, without epispastic) , "One tall " (tall pottery and porcelain closes rate) characteristic. Current, develop with Cf/SiC and SiCf/SiC system in CMCs the fastest, home basically gets together with solid state carbolic silicon alkyl (the precursory body that PCS) regards SiC as, the inadequacy of existence is: Need is deliquescent at organic dissolvent, reduced macerate efficiency, brought contaminative;PCS itself cannot cross-linking, epispastic;PCS pottery and porcelain closes after hot solution rate is not high, restrain 55%; price relatively costly, 3000 ～ 4000 yuan / kilogram. In the meantime, siC radical of composite material optimal enlist in army temperature is controlled in 1600 ℃ , to enlisting in army temperature is 1000 ～ the component of 1300 ℃ , although material can satisfy use requirement well, but can cause function redundant. Exorbitant preparation cost restricted what its use range to extend produce with batch, for example the domain such as pump of chemistry of the high temperature structure, component that prevent heat, high temperature, valve application, be badly in need of finding the substitute that tall sex price compares. Adopt LC3 plan, the United States most the research that began CMCs low cost to change first, decided applying to the SiOC matrix under 1300 ℃ is, developed the precursory system product that applies to PIP craft. Technology of material of peaceful wave of the Chinese Academy of Sciences and lab of project of material of project institute nuclear energy are in " 925 " during assumed forerunner of nuclear energy of Chinese Academy of Sciences special mission, material of precursory to high-powered carborundum body began thorough research. Get together in preparation early days in the research work of carbolic silicon alkyl, the meeting in discovering convention synthesizes a process produces by-product of many young member liquid state. Recently, the guidance that changes research train of thought with low cost is made fall in green, the group begins the research of recycle to afore-mentioned liquid state by-product. In this research, lab researcher undertakes an analysis to the compositive structure of liquid state by-product, decide its are attached most importance to all molecular quantity is in 200 ～ 800 between, advocate the liquid state small element that catenary is Si-C structure measures PCS. Farther, to introduce among them " C=C " active radical is round, preparation but the body of liquid state pioneer of pottery and porcelain of translate into SiOC (LC-PCS) . LC-PCS has following features: Viscosity of ① room temperature makes an appointment with ② of 30mPa · S; to be under 400 ℃ but pottery and porcelain of ③ of sufficient cross-linking; closes rate be more than 70% . Finally, it is precursory body with LC-PCS and PCS respectively, pass CMCs of PIP craft preparation. The result makes clear, get compact sample place needs " macerate - splitting decomposition " cycle reduces 10 from 14. Visible, new synthetic way the cost that from precursory body itself and process of answer material preparation two link reduced CMCs, preparation but the tall sex price that in 1000 ～ 1300 ℃ enlist in army compares CMCs. The recycle of liquid state by-product also realized the green synthesis of PCS, reflected environmental beneficial result. This research achievement entered civil domain to level with high-end material to for military use and nucleus road. Place of peaceful wave stuff changed a technology to had undertaken patent protection to this green low cost (201810433805. 3) , advance the butt joint of downstream product actively. Above job received national science fund (91426304) and science and technology of forerunner of strategy of Chinese Academy of Sciences are special (of XDA03010305) aid financially support. The TG graph 2(a)LC-PCS of;(d)PCS of child of splitting decomposition of ℃ of;(c)1200 of child of solidify of graph 1(a)LC-PCS;(b) cross-linking and LC-PCS and cycle of PCS solution macerate - ;(b)LC-PCS of weightening finish curve is precursory body place to be made 2D Cf/SiOC CNC Milling
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