2022-11-19
2023-06-07The sealing end surface of the mechanical seal is composed of rotating dynamic ring installed on the axis and a static ring fixed on the machine seat. It requires good material wear resistance, low friction coefficient, corrosion resistance, high heating rate, strong seismic performance, siliconization, siliconization Graphite can meet these requirements. According to the determination, when the PV value (seal pressure and speed of the speed) reaches 147MPA · m/s, the hard alloy steel ring will generate thermal stress cracks, while the sealing ring of the silicon graphizer is 687MPa · m/ S instead of damage. It can also be used for water sealing such as shielding pumps and high -horsepower diesel engines. Siliconized graphitic can be used as bearing for pumps such as phosphate, phosphoricide and hydrofluoric acid. In addition, in the semiconductor industry, the heating tablets and fixtures of the growth of silicon extension and manufacturing artificial joints, artificial heart valve,
2023-06-06High hardnessThe hardness of silicon graphite is actually the hardness of SIC. It is second only to diamond, boron nitride, boron boronized, and has high hardness than tungsten tungsten and tritenuxide.Excellent corrosion resistanceSIC is a compound of a combination of covalent bonds. The chemical performance is stable. Except for strong oxidized gases and melting alkali, it is almost not eroded by other acid and alkali.Good high temperature antioxidantSICs with dense SI island glass phase at high temperature to prevent oxygen and SIC from contacting and prevent silicon carbide from continuing to oxidize. Therefore, SIC can be used above 1000 ° C for a long time.Excellent heat shocksSilicon fossils are heated to 1200 ° C for 10s, and they are put into room temperature water. It repeatedly repeatedly, as well as before, neither rupture nor peeling.
2023-06-06SiO2, C, and SIC's reaction freedom can see Table 1.The freedom of reaction between SIO2, C and SICThe reaction of carbon and silicon is shown in Figure 2 with changes in temperature.The reaction of carbon and silicon changes with the temperatureThe thermal treatment temperature of graphite matrix materials (reflects its graphite), thermal expansion coefficient, pore rate and pore diameter size and distribution have a great impact on the seepage process. In order to obtain a good performance of siliconized graphite, the thermal expansion coefficient of graphite matrix materials should be as close to SIC as much as possible. It is best to use the same -sex graphite. The open air pores should be 12%to 15%. The above methods can be carried out according to the needs. For example, first use the CVR method, and then use the CVD method to process it, so that the obtained siliconized graphite is not breathable and free of free silicon. Silicon goblin has the characteristics of carbon and sil
2023-06-06Chemical gas deposition (CVD) method) methodSilicon and carbon -containing gases have a heat decomposition through high -temperature graphite matrix, and SIC is deposited on the surface of the graphite matrix. The raw materials are trichloronetas (CH3SIC3), silicon chloride, hydrogen, silicon steam, etc. The deposition temperature range is wide, from 1175 ° C to 1775 ° C. The SIC layer generated by this method is very dense, the thickness is uniform, and the general thickness is about 0.1 to 0.3mm. However, the combination of SIC and graphite matrix is a combination of pure machinery, and the combination force is weak. When the temperature changes, the SIC layer is prone to cracking and peeling.Chemical Qi Evidence Method (CVR)The raw materials are coke powder and excessive quartz sand or non -fixed silicon powder. Chemical reactions occur when heated to 2000 ° C to generate SIO vapor. SIO steam and carbon -based reactions generate SIC. There is no obvious interface between SIC layers
2023-06-05A new generation of lithium -ion battery negative materials with good graphite performance and low price1. High graphitization and stable structure.2. High capacity and stable charging and discharge.3. Good reversibility, which can effectively improve the utilization rate of positive and active substances.4. Good cycle stability.5. Good performance, safe and reliable.Modified graphite can be used for lithium -ion battery negative electrodes, ball -type modified graphite can be used as lubricant, and can be made into graphite modified polypropylene plastic, which is used to make zero, pipeboard, head, flang, flang, and take -off. Components (good corrosion resistance; small volume, light weight; high temperature resistance; non -toxicity, no scaling, non -polluting medium, can also be used for the food industry)
2023-06-05Plug -in graphite, also known as immersive graphite or immersion immersion graphite. Category of non -transparent graphite.Immersion graphitePinyin: jinzishimoEnglish name: ImpregNated GraphiteNote: Use synthetic resin to penetrate graphite to fill its surface and internal pores, and then make the heat treatment to curing the resin and make it. Compared with graphite, mechanical strength is improved and thermal conductivity is unchanged. With the difference in penetrating resin, there are different varieties such as phenolic graphite and bran glycoling graphite.
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