The experimental results illustrate that the powders ni and cu can promote the sintering densities of w and mo alloys . in the processing of sintering , cu powders melt to become liquid and ni , dissolved in liquid cu , shows more activating sintering feature than the solid ni 实验结果表明：烧结助剂ni 、 cu的添加有助于w 、 mo合金致密度的提高，在烧结致密化过程中， cu主要起到溶解ni的作用， ni溶解主晶相促进致密化的进行。
The magnetic properties result of the sample state that the ultimate 800 - treated mixed sample has the coercive of 4 . 01oe and the core loss at w10 / 50 of 3 . 28w / kg . the main reason may be there was large of oxide in the sample and the density was not high 样品的磁性能的结果表明， 800混料样品最终的矫顽力为4 . 01oe ，铁损w10 50为3 . 28w kg 。所得到的最终样品的磁性能较差，主要是因为样品中存在较多的氧化物和样品的致密度不够理想。
The technique can avoid produce ti / al chemical compound in high temperature . the chemical compound would increase the difficulty of pressing . the research on vacuum degassing and temperature of pressing can acquire the ideal composite powders of highly 对ti / al复合粉进行真空脱气及低温热压制可以降低坯料中空气含量并提高粉末颗粒的界面结合强度,同时避免高温下生成tial基化合物增加致密难度,对真空脱气及压制温度进行研究,获得理想的致密度极高的复合粉末。
By x - ray analysis of the obtained samples the degree of the reaction was researched when the time of ball milling changed . at last the regularity of the metallurgical structure of tial alloy was investigated , when the high temperature changed . the following aspects were accomplished after hot hydrostatic extrusion 热静液挤压工艺:挤压后,坯料致密度有了较大的提高;分析了球磨时间跟挤压力的关系;对ti - al基合金室温断裂方式及断口形貌进行了一定的研究。
The study indicated that intensity of materials was enhanced because tic and zrc diffused in cu matrix , and counterworked the motion of dislocation . the cu - based composite materials that prepared in situ synthesis have more fine capability . the upper density was gained when pressing pressure was increasing , and sintering temperature was 800 研究表明， zrc 、 tic在铜基体中形成弥散强化，阻碍位错移动，提高材料的强度；用原位合成的cu - 50 tic粉末做原料制备的铜基复合材料具有相对优良的综合性能；提高压制压强，在800烧结可得到较高的致密度，而材料致密度的提高会提高材料的各项性能。
The influence of nano - al2o3 on the sintering and the properties of the si3n4 ceramics was researched in this paper . the samples with different amount of nano - al2o3 were obtained by using pressureless sintering at 1600 , 1650 , 1700 in the nitrogen atmosphere . the microstructure and the composition of the ceramics were determined by the means of x - ray , sem , micro - hardness meter etc . it is show that the sisty ceramics can be densified at 1650c to % percent of the theory density through the addition of nano - al2o3 ( the value could be 90 percent by other technique ) . the crystalline growth of the cylindrical - si3n4 and the ratio of its longitude to its diameter are increased with the addition of nano - al2o3 . a uniform microstructure and an fined crystal as well as more sialon phases can be obtained in the si3n4 ceramics through the addition of that 实验结果表明：在碳管炉中、氮气保护下进行烧结，添加剂为纳米al _ 2o _ 3粉末时，由于纳米粉末的高活性、高烧结驱动力，在1650就可使si _ 3n _ 4完全地烧结，并使其致密度可达理论密度的96以上(比其它工艺高6左右) ；同时，纳米al _ 2o _ 3地加入大大促进了长柱状? si _ 3n _ 4的生长和发育及柱状晶长径比的提高，使微观结构均匀、细化，形成了更多力学性能优异的固体? sialon相，减少了不利于陶瓷材料性能的晶间玻璃相，净化了晶界。
The experimental results show thatthe high sintered density of m2t and fine thermal stability could got with the 5wt % additive of zro2 at 1500c for 2 hours . and the additive of m2t can effectively restrain the decomposition of at and promote the sinter process , which enhanced the density of at and promote the strength 实验研究表明， m2t在加入5wt的zro _ 2后，能够在1500保温2小时烧结致密，且热性能稳定。 m2t不但可以有效地抑制at的分解，而且能够有效促进at的烧结，提高at的致密度，进而提高其力学强度。
In this paper , nanosized al2o3 ceramic particles were chose as reinforcing phase . enhanced with ultrasonic wave the particles were covered with copper using method by electroless plating , the copper - matrix composite was developed by hot - press sintering process of the composite powder . the composition , microstructure , hardness , density and dry sliding wear property of the new material have been studied 研究路线为：选用纳米级al _ 2o _ 3陶瓷颗粒作为增强相，在超声波的环境中用化学镀的方法完成对纳米al _ 2o _ 3陶瓷颗粒表面的金属铜包覆，采用热压烧结成型技术以复合粉末为原料制备成纳米al _ 2o _ 3陶瓷颗粒增强铜基复合材料，研究分析复合材料的成分、组织结构、硬度以及致密度，对试样进行了干滑动摩擦磨损实验。
The analysis of microstructure of samples showed that the grain of tio2 were very small under 700 , the distance of grain became small with temperature increasing , the rate and size of pore was decreasing . the relative density of sample at 900 was 97 % and the grain size of sintered body was about 200nm . when the temperature exceeded 1100 , the grain size of body grew up several times ( > 2 m ) Tio _ 2烧结体sem显微形貌分析表明：低温( 700 )时坯体内颗粒无明显长大，烧结体致密度不高( 80 )晶粒间距随温度升高而变小，气孔率也随之降低，气孔尺寸变小；当温度超过900时，晶粒间连接紧密，烧结体内出现大量絮状物质，致密度大幅度提高，达97以上，小气孔已聚集成大孔洞且分布均匀，晶粒长大不明显( 200nm左右) ；当温度超过1100时，烧结体致密度有所提高，但晶粒尺寸出现异常长大，长大了十几倍(达2 m以上) 。
The speed of sintered was faster with smaller size of particls than larger size , there were more pore in the corresponding sample so as to having lower relative density . higher pressure contributed to the exhausting of pore and relative density . the sintered body of tio2 whose particles had been mixed with liquor had a higher relative density ( 98 . 6 % ) than the body without liquor ( 96 . 4 % ) 采用干混法在巧mpa压力下成型、 950烧结的tio :样品相对密度为96 . 4 % ，而湿混造粒后烧结的样品相对密度达98 . 6 % ，虽然烧结过程中所施加的轴向高压可以使气孔大量排出，但成型工艺对烧结体致密度的影响是不同忽视的。
