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渣漿泵機(jī)械密封的材料分那幾種規(guī)格
(1) 摩擦副材料
①石墨浸漬:可以是純石墨或石墨浸漬樹(shù)脂或浸漬金屬。石墨有良好的自潤(rùn)滑性和導(dǎo)熱性，摩擦系數(shù)低，耐腐蝕，并有好的加工性，但它的缺點(diǎn)是機(jī)械強(qiáng)度低，耐溫低。浸演后的石墨比純石墨強(qiáng)度提高很多，浸漬酚醛樹(shù)脂用于溫度低于170C，呋喃樹(shù)脂、環(huán)氧樹(shù)脂用于溫度低于200%。浸金屬石墨不但強(qiáng)度好，并可耐較高溫度，浸青銅、鋁、鉛、銻、巴氏合金等，溫度可達(dá)400C。
②聚四氟乙烯:有優(yōu)異的耐腐蝕性，但具有機(jī)械強(qiáng)度較低、耐磨性不高、剛性差、彈性小、線(xiàn)膨脹系數(shù)隨溫度增大等缺點(diǎn)，所以常加填充玻璃纖維、二 硫化鉬、石墨及各種金屬加以改進(jìn)。
③酚醛塑料:它有較好耐酸性、耐磨性、成本低，但它質(zhì)脆，不耐堿腐蝕，使用溫度低于120C。
④氧化鋁陶瓷:它具有很高的硬度及耐磨性，耐腐蝕性也很強(qiáng)，價(jià)格低，但脆性大，機(jī)械加工困難。
⑤硬質(zhì)合金:硬度高，強(qiáng)度高，耐磨性，耐腐蝕，抗沖刷性好，可用于< 500C的場(chǎng)合，但其價(jià)格較高。采用堆焊、鑲環(huán)的方法，可降低成本，但容易產(chǎn)生缺陷，鑲環(huán)在高溫中易脫落、變形等。
⑥碳化鎢硬質(zhì)合金:碳化鎢是由硬度極高的難熔金屬碳化物加粘結(jié)劑用粉末冶金方法壓制燒結(jié)而成。具有極高的硬度和強(qiáng)度，極好的耐磨性，抗顆粒沖刷性和耐腐性，線(xiàn)膨脹系數(shù)較低。但材料脆性大，機(jī)械加工困難。
⑦青銅:常用的是磷青銅、錫青銅，其彈性模數(shù)大，導(dǎo)熱性好，加工性好，它對(duì)硬質(zhì)材料有順磨性。但質(zhì)軟，耐腐蝕性差。適用油類(lèi)等中性介質(zhì)，特別適用于海水，不適用于有固體顆粒的介質(zhì)。
⑧高硅鑄鐵:具有較高的硬度，在強(qiáng)氧化性酸中有很高的耐腐蝕性，但不耐堿和氫氟酸，并且質(zhì)脆，耐沖擊性能差，機(jī)械加工困難。
⑨碳化硅陶瓷、氮化硅陶瓷:屬于新型陶瓷，硬度高于氧化鋁陶瓷，耐磨性，耐熱性，耐蝕性，更優(yōu)于氧化鋁陶瓷，摩擦系數(shù)低，可用于各種無(wú)機(jī)酸和有機(jī)溶劑。
(2)輔助密封圈材料
①天然橡膠:使用溫度- 50~ 120C。其彈性和低溫性能好，但不耐高溫，不耐油，易老化。一般用于溫度不高的水中。
②丁苯橡膠:使用溫度- 30~120C。耐磨，耐老化，價(jià)格低，彈性好。不耐礦物油，但耐動(dòng)、植物油。一般用于水、 動(dòng)植油及酒精類(lèi)介質(zhì)，不能用于礦物油。
③丁腈橡膠:使用溫度-30~ 120C。耐油，耐磨，耐老化，但不耐高溫，應(yīng)用很廣泛。可用于燃料油、礦物油和水中。
④硅橡膠:使用溫度-70 ~250C。耐高溫，耐低溫，也耐油。但機(jī)械強(qiáng)度差，僅為丁腈橡膠的1/3，并且耐腐蝕性較差。適用于高溫、低溫介質(zhì)中使用。不適用于苯、丙酮類(lèi)介質(zhì)。
⑤氟橡膠:使用溫度-20~ 250C。耐高溫，耐腐蝕，耐油，耐真空性。但耐低溫較差，膨脹系數(shù)大，價(jià)格高。適用于高溫、腐蝕的場(chǎng)合，不適用于酮類(lèi)溶劑。
⑥填充聚四氟乙烯:使用溫度- 100 ~250C。有優(yōu)異的化學(xué)穩(wěn)定性，耐油，耐高溫，耐低溫，耐溶劑，抗老化等。但彈性差，膨脹系數(shù)大，溫度不高時(shí)易泄漏。適用于高溫，低溫，酸、堿溶劑等強(qiáng)腐蝕性介質(zhì)。
⑦柔性石墨:使用溫度- 200 ~ 100C。其耐溫性，耐腐蝕性極其優(yōu)良，是一種新型材料，能使用在所有介質(zhì)中。
(3)彈簧材料
①磷青銅：防磁性，適用于海水和油類(lèi)介質(zhì)中，但不耐腐蝕。
②碳素彈簧鋼：價(jià)格低，適用于無(wú)腐蝕性介質(zhì)中。
③不銹鋼:可用于腐蝕性介質(zhì)中。 渣漿泵廠家
Material of mechanical seal
(1) friction pair material
① graphite impregnation: it can be pure graphite or graphite impregnated resin or impregnated metal. Graphite has good self-lubricating and thermal conductivity, low friction coefficient, corrosion resistance and good processability, but its disadvantages are low mechanical strength and low temperature resistance. The strength of graphite after impregnation is much higher than that of pure graphite. The temperature of impregnated phenolic resin is lower than 170C, and that of furan resin and epoxy resin is lower than 200%. Impregnated graphite not only has good strength, but also can withstand high temperature. It can be impregnated with bronze, aluminum, lead, antimony, Babbitt alloy, etc. the temperature can reach 400C.
② polytetrafluoroethylene: it has excellent corrosion resistance, but it has the disadvantages of low mechanical strength, low wear resistance, poor rigidity, small elasticity, linear expansion coefficient increasing with temperature, etc., so it is often filled with glass fiber, molybdenum disulfide, graphite and various metals for improvement.
③ phenolic plastic: it has good acid resistance, wear resistance and low cost, but it is brittle and alkali resistant, and the service temperature is lower than 120c.
④ alumina ceramics: it has high hardness and wear resistance, strong corrosion resistance and low price, but it is brittle and difficult to machine
⑤ cemented carbide: high hardness, high strength, wear resistance, corrosion resistance and erosion resistance. It can be used in occasions of < 500C, but its price is high. The method of overlay welding and inlay ring can reduce the cost, but it is easy to produce defects, and inlay ring is easy to fall off and deform in high temperature.
(6) tungsten carbide: tungsten carbide is made of refractory metal carbide with high hardness and binder by powder metallurgy. It has high hardness and strength, excellent wear resistance, particle erosion resistance and corrosion resistance, and low coefficient of linear expansion. But the material is brittle and difficult to machine
⑦ bronze: commonly used are phosphor bronze and tin bronze, which have large elastic modulus, good thermal conductivity and processability, and are smooth to hard materials. But it is soft and has poor corrosion resistance. It is suitable for neutral medium such as oil, especially for sea water, not for medium with solid particles.
⑧ high silicon cast iron: it has high hardness, high corrosion resistance in strong oxidizing acid, but it is not resistant to alkali and hydrofluoric acid, and it is brittle, poor impact resistance, and difficult to machine.
⑨ silicon carbide ceramics and silicon nitride ceramics: they are new ceramics, with higher hardness than alumina ceramics, wear resistance, heat resistance and corrosion resistance, better than alumina ceramics, low friction coefficient, and can be used for various inorganic acids and organic solvents.
(2) auxiliary seal ring material
① natural rubber: service temperature - 50 ~ 120c. It has good elasticity and low temperature performance, but it is not resistant to high temperature, oil and aging. Generally used in water with low temperature.
② styrene butadiene rubber: service temperature - 30 ~ 120c. Wear resistant, aging resistant, low price, good elasticity. Not resistant to mineral oil, but resistant to animal and vegetable oil. It is generally used in water, animal and vegetable oil and alcohol media, but not in mineral oil.
③ NBR: service temperature - 30 ~ 120c. Oil resistant, wear-resistant, aging resistant, but not high temperature resistant, widely used. It can be used in fuel oil, mineral oil and water.
④ silicone rubber: service temperature - 70 ~ 250C. Resistant to high temperature, low temperature and oil. But the mechanical strength is poor, only 1 / 3 of NBR, and the corrosion resistance is poor. Suitable for use in high and low temperature medium. Not suitable for benzene and acetone media.
⑤ fluororubber: service temperature - 20 ~ 250C. High temperature, corrosion, oil and vacuum resistance. But it has poor low temperature resistance, large expansion coefficient and high price. It is suitable for high temperature and corrosion, not for ketone solvent.
⑥ filled with polytetrafluoroethylene: service temperature - 100 ~ 250C. It has excellent chemical stability, oil resistance, high temperature resistance, low temperature resistance, solvent resistance, anti-aging and so on. But it is easy to leak when the temperature is not high. Suitable for high temperature, low temperature, acid, alkali solvent and other corrosive media.
⑦ flexible graphite: service temperature - 200 ~ 100C. It has excellent temperature and corrosion resistance. It is a new material and can be used in all media.
(3) spring material
① phosphor bronze: anti magnetic, suitable for sea water and oil medium, but not resistant to corrosion.
② carbon spring steel: low price, suitable for non corrosive medium.
③ stainless steel: it can be used in corrosive medium Slurry pump manufacturer
