The plastics matrix might be exposed with under - coarsing . the cracks might appear on the coating with over - coarsing . ( 2 ) the thickness of copper coating should be over 5m for preventing coating wrinkle ( 2 )電鍍銅時銅鍍層必須具有一定的厚度,不應(yīng)低于5林m ,防止鍍鎳后鍍層起皺,從而影響鍍層與基體的結(jié)合力。
To obtain light radar wave absorbing materials , the electroless nickel plating on hollow glass beads and mica was studied . after pretreatment of coarsing , sensitivzed , activation , and reduction , the hollow glass beads and mica powders were plated with nickel 研究了在空心微珠和云母上的化學(xué)鍍鎳,嘗試在微珠上鍍鎳制備輕質(zhì)雷達吸波材料,發(fā)現(xiàn)空心微珠壁太薄,經(jīng)攪拌和加熱后破碎太多,但從形貌上看已經(jīng)實現(xiàn)了表面化學(xué)鍍鎳。
The result reveales that the decrease of sediment transportation of the upper reaches results in riverbed scouring and coarsing on yidu reach ; the upper and lower shallow regions in shahong are separately deepened and broadened , while the thalweg in shihong is lowered , and nanyangqi is scoured and draw back … all the above may cause variation of the distribution pattern 結(jié)果表明,來沙量減少使宜都水道沖刷,沙泓上淺區(qū)沖刷下切,而下淺區(qū)以沖灘為主,石泓深泓沖刷下降,南陽磧沖刷縮小,分流格局有發(fā)生變化的趨勢。
Abstract : in light of thicker grain and smaller viscosity of debris flow , a segmented simulation of the debris flow with flume is presented . for the first time . more difficult resistance similarity is brought about by geometric rate without excessive coarsing and discontinuous similarity of sand grain composition in model is eliminated with different grain scale . on this basis the density similarity and sand conveying similarity are achived . the method presented is verified through a model test case 文摘:針對水石流顆粒粗,粘性小的特點,提出了利用水槽進行分段模擬水石流的設(shè)想,首次通過幾何變率解決難度較大的阻力相似問題,改變了以往過度加糙的方式;通過變粒徑比尺的方法消除了模型沙級配不連續(xù)相似的問題,較好地實現(xiàn)了固體物質(zhì)級配相似,達到了泥石流的密度相似和輸沙相似.通過水槽概化模型試驗實例,對本方法進行了驗證
( 1 ) first , metallizing abs plastics surface by chemical coarsing , metal ion absorption , metal ion reducing and chemical copper - plating . then , the copper - coating was thickened by electroplating in order to improve adhesion between following - coating and plastics matrix , and nickel was preplating . finally , ni - sic composite was plated ( 1 )通過反復(fù)實驗,確定工藝流程:首先通過粗化、敏化、活化和化學(xué)鍍銅,使塑料表面金屬化,再電鍍銅加厚銅鍍層,增強后續(xù)鍍層與塑料基體的結(jié)合力,然后預(yù)鍍鎳,最后電鍍ni ? sic復(fù)合鍍層。