| 1. | Researches and applications of compound diamond core bit with sintered body
混合型金刚石烧结体取心钻头的研制及应用 |
| 2. | The microstructure of sintered body was observed by scanning electron microscope ( sem )
液相烧结时，颗粒合并是w颗粒长大的主要机制。 |
| 3. | Low heating rate and high sintered pressure were profitably for reducing the rate of pore so as to increase the relative density of sintered body
低的升温速率和高的烧结压力有利于气孔的排出，降低气孔率，从而提高烧结体的致密度。 |
| 4. | The periodicity fluctuating has been produced by pulse magnetic field so that there are periodic high temperature region exists in sintered body , it results in the symmetrical crack in sintered body of zro2
感生磁场的存在引起电场周期性的波动，在烧结体内产生不同的温度区域，是造成烧结体内产生分布均匀裂纹的主要原因。 |
| 5. | Xrd analysis at different depth of zro2 sintered body indicates that it has trace to be bombarded by high - energy particles at top surface , this results are the evidence for the existence of pulse electric field
Zro _ 2烧结体不同深度的xrd分析表明：样品表面有被高能粒子轰击过的痕迹，脉冲电场诱发场发射电子及高能c粒子对样品表面轰击。 |
| 6. | In this paper ， the development history of reaction sintering was reviewed first , and the parameters used to describe the progress of reaction sintering and the f actors affecting reaction sintering and the microstructure of sintered body were analyzed . in addition , the developing trend of reaction sintering process was sum marized
本文首先回顾了反应烧结的发展历史，在此基础上对描述反应烧结过程的相关参数、反应烧结的影响因素以及烧结体的显微结构特征进行了概述，并分析了反应烧结工艺的发展方向。 |
| 7. | With the same sintered conditions , the relative density of sintered body was 98 . 7 % at 25mpa sintered pressure and it was 91 . 4 % at 12mpa . reducing heating rate enhanced the density of sample . the density was more than 98 % and had finest microstructure with a heating rate of 100 ? / min , it was 94 . 8 % at 300 ? / min heating rate
相同烧结条件下，烧结压力为25mpa的tio :烧结体的相对密度为98 . 7 % ，而12mpa的仅为91 . 4 % ;以100 / min升温的烧结体中晶粒形貌均匀，相对密度达98 %以上，而以300 / min升温的烧结体中晶粒形貌不均匀，部分晶粒已异常长大，有大尺寸的气孔存在，相对密度为94 . 8 % ，当然过低的升温速率会延长烧结时间，烧结时间的延长也会引起晶粒的快速长大。 |
| 8. | The studies indicate that different content of pyrophyllite and dolomite can cause the following three cases : ( 1 ) making the refractory point decrease linearly and , to some extent , influencing the microstructure and properties of sintered body ; ( 2 ) acceleratingmullite formation during sintering , reducing thermal expansion coefficient of bond , reinforcing the matching nature and improving the flexural strength and shock strength ; ( 3 ) preventing sic grinding tool from generating black core , expanding suitable sintering temperature range of sic grinding tool
同时，也不同程度地影响了磨具烧结体的微观结构和性能； ( 2 )可促进在烧结过程中莫来石的形成，降低结合剂的热膨胀系数，加强了结合剂与磨料的匹配性，提高了磨具的抗折强度和抗冲击强度； ( 3 )在一定温度范围内还可防止碳化硅磨具出现黑心现象，拓宽了碳化硅磨具的烧结温度适应范围。 |
| 9. | 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) 。 |
| 10. | 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。 |
