【正文】 然而 ,由于高孔隙率的 原因 和相互聯(lián)系的本質(zhì)在 CBCF 基質(zhì)孔隙度 ,一些油漆滲透到深度 600lm。 、 60176。 組成的膠 ， 密度高碳 碳復(fù)合材料作熔覆壓力 5 kPa(注意 ,多粒子 中碳的多孔介質(zhì)內(nèi)部的是有時被稱為化學(xué)蒸氣滲透 )。 的 金屬 。 除了薄層膠體 CVD 碳石墨涂料性能的改善 ， 而腐蝕能力的石墨鋁箔略退化為 CVD 層太瘦了防止 像耕田一樣的 機制 。, 75176。, where the erodent stream is perpendicular to the erosion surface, and brittle fracture was the predominant mechanism of material removal. The exception was the graphite foil material which displayed maximum erosion at an angle of incidence of 60176。5 mm. The erodent used was angular equiaxed silica sand obtained from Hepworth Minerals and Chemicals Ltd, Redhill, UK. The erodent was sieved to particle sizes between 150 and 300 lm, the mean size (by weight) was 230 lm which was found by a laser difrac tion method (Mastersizer 1005, Malvern Instruments Ltd, Malvern, UK). The velocity of the particles was 6 m s\1, found by the streaking camera technique at the position of the target. This method involved expo sing the film for a known length of time and measuring the length of the line that the particle produces on the film. Erosion tests were carried out at angles of 30176。 唯一的例外是石墨箔材料顯示角度為最大侵蝕 角度為 60176。 通常 ,韌性和脆性材料具有不同的侵蝕特點 。石墨油漆涂料 ,也應(yīng)用于 以 CBCF 襯底 的 。這個方法涉及 各行各業(yè)，即 為已知的時間長度測量線的長度 ,粒子的產(chǎn)生 光影 。 3 結(jié)果和討論 CBCF 絕緣材料的結(jié)構(gòu) ,孔隙度的內(nèi)容的網(wǎng)絡(luò)是異常高的 ，達 87%的復(fù)合構(gòu)成的開放和互聯(lián)的 基礎(chǔ) 。 這個 多粒子 是由把碳從氣態(tài)階段到涂層在 CVD爐。這個過程被重復(fù)和累積的質(zhì)量損失從 多次的循環(huán)中記錄 。進一步的樣本產(chǎn)生不利涂料和石墨襯 多粒子 (樣本指定 CVD 的試樣 )，在 一段 75 h 上面描述的條件下。 給出的結(jié)果包括穩(wěn)態(tài)侵蝕率作為函數(shù)的角度定義的條件下的沖擊。結(jié)果 真空成型工藝生產(chǎn)中所使用的復(fù)合材料纖維的成層不連續(xù)導(dǎo)向 ,形成一個二維平面隨機結(jié)構(gòu) 。 , is equal to the mass of positepressure of 5 kPa. (Note that the CVD of carbon in the interior of a porous medium is sometimes termed chemical vapour infiltration, CVI.) Another cladding material was graphite foil which was produced by Toyo Tanso by pressing exfoliated graphite ?akes in a rolling operation [23]. The foil is ?exible in nature and is predominantly held together by mechanical locking, as no binder is used. Further samples were produced by subjecting the Calcoat coating and the graphite foil to a CVD treatment (samples designatedCVD in Table I) for a period of 75 h under the conditions described above. A more extensive description of the materials will be forthing in the discussion on the microstructures. . Micro structural and surface observations Samples for optical microscopy were vacuum impregnated with resin and subsequently polished to a 1 lmfinish. Samples for SEM were mounted on to aluminium tabs and examined at an accelerating voltage of 20 kV. In the majority of cases, coating was not required due to the sufcient electrical conductivity of the carbon samples。C in vacuum . Investigations into the microstructure [3, 4], mechanical properties [2, 5— 9] and thermal properties [10, 11] of these materials have been reported. ( 1997 Chapman amp。C in nitrogen to carbonize the resin constituent of the colloid. Higher density carbon— carbon posites (39。 涂層和熔覆材料顯示一個更大的抗侵蝕對所有 角度的發(fā)病率比多孔碳復(fù)合材料。 天然氣的優(yōu)勢淬火熱處理中 ， 相對于一個油淬火 ,冷卻速度是可以控制的 ；因此， 它有可能減少對變形和開裂的組件 。 2 實驗過程 這個 CBCF 用作基體上標(biāo)準(zhǔn)的商業(yè)材料 (密度 ),公司生產(chǎn)的涂層和熔覆材料 ,應(yīng)用在 x y 平面上的 CBCF 基質(zhì) 。從篩的是粒子大小在 150nm 到 300nm 之間、平均大小 (重量 )是 230mg/m。掃描電鏡樣品 ,安裝在選項卡并檢查了鋁在加速電壓 20 千伏。大型塊狀 的碳 (500lm)被發(fā)現(xiàn)的 各 層 之 間 ,可以看到在該計劃部分微型圖。當(dāng)計算其腐蝕率、大規(guī)模的從滲透 時， 必須被考慮的 。文丘里安裝在系統(tǒng)允許粒子傳遞壓縮空氣中流動。 此外 ,一個高密度碳復(fù)