【正文】 合材料由使用 CVD 在一段 800 h 滲透到 5 毫米厚的部分CBCF 襯底一個(gè)密度的 3 m/mg。 由于高孔隙度和纖維取向、導(dǎo)熱系數(shù)垂直于纖維層 比較 低 ,一個(gè)典型的 有用 的材料有 表面 密度 ℃ 的真空中 2020℃。 500 lm。 of particular interest is their relationship between the erosion rate and the angle of incidence [15]. Ductile materials tend to display maximum erosion at glancing angles of impact, approximately 30176。 for metals, and material removal is thought to occur by a micromachining mechanism with a contribution of deformation wear at higher angles. On the other hand, for brittle materials, maximum erosion is found where the erodent stream is perpendicular to the erosion surface, and material removal typically results from the formation of Hertzian or lateral cracks . Although it is a convenient approach to idealize materials erosion behaviour in this manner, it is an oversimplification, because erosion is found to depend on other factors, including the erosion conditions, such as erodent par ticle size and shape, as well as the details of the microstructure of the target material . This paper is concerned with the examination of the microstructure and the efectiveness in improving the erosion resistance of several candidate coatings and claddings. The results presented involve the steady state erosion rate as a function of impingement angle under defined conditions. The overall aim of this work is to relate the microstructure to the erosion data by means of a mechanistic approach .materials included the Fiber Materials Inc. C3 posite], which is resin impregnated, and the Toyo Tanso G3470 . In addition, a highdensity carbon— carbon posite was produced by employing CVD over a period of 800 h to infiltrate a 5 mm thick section of the CBCF substrate to a density of 1 Mg m\3. The CVD process used natural gas as the carbon precursor and nitrogen as the carrier gas. The densification was carried out at approximately 1100 176。40 lm) are found between the layers of woven cloth, as can be seen in the plan section micro graph in Fig. 3b. This may result from the use of a highviscosity resin or a low impregnation pressure. 外文資料譯文 碳結(jié)構(gòu)和固體顆粒侵蝕的保護(hù)高度多孔炭碳 復(fù)合保溫材料的使用 材料系，英國(guó)皇家理工學(xué)院，技術(shù)和醫(yī)學(xué)，倫敦 SW7 2BP,英國(guó) 多粒子侵蝕進(jìn)行了測(cè)試 備用 涂料 ,( 膠狀石墨油漆 )和 電鍍 （ 密集的碳 — 亞邦復(fù)合材料和石墨信息 ） 用來(lái)保護(hù)多孔碳材料 — 碳復(fù)合保溫在真空和惰性 氣體 熔爐 ,利用惰性氣體淬火 。 調(diào)查顯微組織、力學(xué)性能和熱性能 ， 這些材料被 運(yùn)用 。心血管疾病過(guò)程使用天然氣 ,作為碳和氮的前身為載體氣體。在通過(guò)一個(gè)噴嘴內(nèi)部直徑著一個(gè) 8 毫米 ,粒子襲擊的目標(biāo)的一個(gè) 站 點(diǎn) 的 40mm 的距離。 因此侵蝕 率以下列方式被發(fā)現(xiàn) ， 每個(gè)示例只獲得了從單劑量 ， 總質(zhì)量變化的每一份樣本 。 碳結(jié)構(gòu)和固體顆粒侵蝕的保護(hù)高度多孔炭碳復(fù)合保溫材料的使用 就是這樣。 微觀結(jié)構(gòu)和表面的觀察 樣本用于光學(xué)顯微鏡真空浸漬樹脂和隨后 拋光。 從使用的角度晶粒得到硅砂礦物質(zhì) ，運(yùn)用于化工廠 。C 在縮水 。這個(gè)金屬的熱處理 ， 如工具鋼 ,越來(lái)越開展的熔爐 ,利用氣體淬火 (通常是氮是使用 ) 氣體淬火可以降低周轉(zhuǎn)期的間歇過(guò)程或作為一個(gè)整 體的一部分 ,熱處理制度。 此外 ,效果很薄的化學(xué)氣象沉積 (CVD)碳層上的油漆涂料和膠體石墨石墨鋁箔復(fù)合進(jìn)行了 檢驗(yàn)。 the xy plane is perpendicular to the direction of minimum thermal conductivity and hence is most likely to be the exposed surface of the insulation in a furnace. The coating and cladding materials exam ined in this paper were all carbon based and they are listed in Table I. The coating materials are defined as those that bond independently to the CBCF substrate,whereas the claddings are bonded by means of a car bonizing cement. Calcoat and Calcoat M are colloidal graphite paint coatings that were applied to the CBCF