The plating copper is a key process in the production of PCB, which involves the quality assurance of metallization of PTH holes and laminate surface, and is affected by a number of factors. 电镀铜是PCB加工过程中的一个关键工艺流程,涉及到孔和板面金属化的性能保证,影响因素众多。
Base on studying of properties of the refractory copper ore and a large number of particular tests, the suitable mineral processing flowsheet has been defined. 在研究矿石性质的基础上,通过大量、详细的试验,确定了与该矿相适宜的选别工艺流程。
The following determinations were made on the initial and aged samples: MIT folding endurance, internal tearing resistance, bursting strength, breaking length, brightness, copper number and average degree of polymerization. 纸张老化前后测试的性能为MIT耐折度、撕裂度、耐破度、裂断长、白度、铜价和聚合度。
Measurements of folding endurance, internal tearing resistance, brightness, and copper number or average degree of polymerization were strongly recommended for papers before and after accelerating aging. 建议测量纸张老化前后的耐折度、撕裂度、白度和铜价或聚合度。
The traditional production of copper strips by the process of rod casting wire drawing annealing has a number of drawbacks such as too many work steps, long production period, high cost, product size related to raw materials size etc. 铜扁线加工一直沿用传统的铸杆拉拔退火工艺,其生产工序多、周期长、成本高,原料尺寸与产品规格有关,不利于多品种、小批量的生产模式。
In the copper wires, with the number of grain boundaries increasing, the resistivity of copper wires increases. 在铜导线中,随晶界数的增加,导线的电阻率增加。
Describes the impact of tooth parameters of ACR inner-thread copper tube, the number of racks and addendum angle, on its heat transfer and pressure drop performance. 介绍ACR内螺纹铜管齿形参数&齿条数及齿顶角对蒸发单管换热性能及阻力性能的影响。
Though annealing at different temperatures, the copper wires of the various number of grain boundaries can be obtained. 通过设计不同的退火温度,得到了含不等晶界数的铜导线,以此研究了晶界对导电性的影响。
Methods Human umbilical cord blood hematopoietic cells were irradiated with copper vapour laser and cultured in vitro. The number of colony and cells was calculated. 方法用铜蒸气激光照射人脐带血造血细胞,体外培养扩增细胞并计数集落细胞数。
It was observed that samples bleached in neutral region showed maximum copper number, mini-mum tensile strength, minimum degree of polymerization, and greatest potential damage. 可以看出经过近中性范围内漂白的样品铜值最大,强度最低,聚合度最低,并具有最大的潜在损伤。
In the cyanide gold extraction process, the soluble copper in the ore will cause a large number consumption of cyanide, and affect the gold leaching. 氰化提金过程中,矿石中的可溶性铜会造成氰化钠的大量消耗,影响金的浸出。