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多孔氧化鋁陶瓷的放電等離子燒結(jié)技術(shù)制備(編輯修改稿)

2025-08-09 22:31 本頁面
 

【文章內(nèi)容簡介】 articles. In , there is a slight decline in porosity when the heating rate goes up from 50 K/min to 100 K/min, which is followed by a roughly level off in porosity when the heating rate reaches 400 K/min. Therefore, an appropriate ascend of heating rate has a positive effect on the porosity of the samples, and there exists different optimum heating rate for different systems.顯氣孔率的測量是基于阿基米德主要方法。 ,在燒結(jié)過程中對孔隙度的不同工藝參數(shù)的影響。如可于圖2 4中可以看出,表觀孔隙率隨燒結(jié)溫度和增加保持時間略有減小,而所施加的壓力有因為高硬度和原料顆粒的大尺寸的影響較小的孔隙率。在圖5中,有在孔隙率略有下降,當(dāng)加熱速率上升為50 K /分鐘至100 K /分鐘,這之后是在孔隙大致平整時的升溫速率達(dá)到400 K / min的。因此,升溫速率適當(dāng)?shù)倪f增有對樣品的孔隙率有正面影響,并且存在不同的最佳加熱速度為不同的系統(tǒng)。 The effect of sintering temperature on porosity for porous Al2O3 ceramics(pressure: 48 kPa。 holding time: 10 min。 heating rate: 100 K/min)圖2燒結(jié)溫度對孔隙度的多孔氧化鋁陶瓷的影響 (壓力48千帕。保溫時間:10分鐘。升溫速率:100 K /分鐘) The effect of uniaxial pressure on porosity for porous Al2O3 ceramics.(SPS temperature: 1 223 K。 holding time: 15 min。 heating rate:100 K/min)圖3的單軸壓力對孔隙度為多孔的影響 氧化鋁陶瓷。 (SPS溫度:1開氏223度,保溫時間:15分鐘。升溫速率:100 K /分鐘)Fig,4 The effect of holding time on porosity for porous Al2O3 ceramics.(SPS temperature: 1 223 K。 pressure: 0 kPa。 heating rate: 100 K/min)圖,保溫時間對孔隙度的多孔4的影響 氧化鋁陶瓷。 (SPS溫度:1開氏223度,壓力:0千帕。升溫速率:100 K /分鐘) The effect of heating rate on porosity for porous Al2O3 ceramics.(pressure: 0 kPa。 holding time: 1 min。 SPS temperature: 1 223 K)圖5的加熱速度對孔隙度的多孔的影響 氧化鋁陶瓷。 (壓力:0千帕。保溫時間:1分鐘。 SPS溫度:1223 K) Microscopy observation shows SEM micrographs of sintering neck of the SPS specimens at the sintering temperature of 1 173 K, an applied pressure of 80 kPa and a holding time of 5 min. As can be seen, there are necks formed at the contacts between particles. The forms of the pores are regular.圖6示出燒結(jié)的所述SPS試樣在1173 K,80千帕的施加壓力并在5分鐘的保持時間,燒結(jié)溫度頸部的SEM顯微照片。如可以看到的,也有形成在顆粒之間的接觸的脖子。的孔的形式是規(guī)則的。(pressure: 80 kPa。 holding time: 5 min。 SPS temperature: 1 173K。 heating rate: 100 K/min) Calculation of relative necks相對脖子的計算Suppose all the specimens put into the graphite die exhibited similar packing configuration, the relationship between the volume of the cylindrical samples and porosity can be depicted by these formulas.. where εb is the porosity of the specimens before sintering, εa is the porosity of the specimens after sintering,Vb is the volume of the specimens before sintering,Va is the
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