Al-12.07%Si对太阳能发电站储能容器的腐蚀研究

在太阳能热发电站中,选择Al-12.07%Si作为储能材料,310S不锈钢作为储能容器,并将310S不锈钢沉浸在Al-12.07%Si中进行长达1080 h的腐蚀。通过SEM、EDAX、XRD方法分别对腐蚀后的试样腐蚀层形貌、腐蚀层的成分和腐蚀试样的物相进行分析。研究结果发现,310S不锈钢基体与腐蚀层交界面的形状较平整和规则,试样表面均出现了Fe2Al5和FeAl3相。随着腐蚀时间延长,腐蚀试样的失重和腐蚀层厚度逐渐稳定,试样的腐蚀速率下降。

耐熔融Al-12.07%Si合金腐蚀有机硅树脂涂料防护层的制备及其性能

为了提高太阳能热发电系统20G钢换热管的使用寿命,制备了2种耐熔融Al-12.07%Si合金腐蚀有机硅树脂涂料防护层(T1,T2),对其力学性能及耐腐蚀性能进行了研究。结果表明:2种防腐蚀涂层的抗热震性能良好,与基体的粘结强度较高;2种涂层均具有较强的耐熔融Al-12.07%Si合金腐蚀的性能,较耐腐蚀的T2涂层使用寿命是20G钢的19倍。

太阳能热发电中Al-12.07%Si储热材料的组织结构和热稳定性

在太阳能热发电中采用Al-12.07%Si合金作为储热材料,对该材料的热稳定性进行研究。结果发现,相比0次循环的Al-12.07%Si储热材料,经2160次储热放热循环后,Al-12.07%Si储热合金中没有新组织产生,熔化起始温度仅提高了0.64%,熔化潜热仅下降9.14%,这说明该储热合金具有良好的热稳定性。

Al-50% Si合金封装壳体与LTCC基板的热匹配试验

对Al-50% Si合金封装壳体与LTCC基板进行了钎焊,测试了焊后以及温度冲击试验后壳体的平面度,并对LTCC基板焊接开裂和电信号通断进行了检测。热膨胀匹配性试验结果表明,Al-50% Si合金封装壳体与LTCC基板的热匹配性较好,在钎焊面积达到71 mm×60 mm时未出现裂纹。Al-50% Si合金是一种具有广阔应用前景的封装材料。

Microstructural Evolution of Cast Hyper-Eutectic Al-18% Si Alloy during Cyclic Semi-Solid Heat Treatment

The cyclic semi-solid heat treatment represents a promising technique for improving microstructure and mechanical properties of a wide range of metallic alloys. In the current research the influence of cyclic semi-solid heat treatment on microstructure of Al-18% Si alloy containing 0.8% Fe has been studied. All specimens were heated in an electrically heated resistance furnace with heating rate of 10°C·min-1 to 585°C. For a complete one cycle heat treatment (5 min heating time), samples after 5 min holding at 585°C were cooled to a temperature of 550°C in still air cooling and the samples were taken out immediately for water quenching. It was found that heat treatment cycles should be limited to 3 cycles or less in order to maintain fine grain size and globular structure without agglomeration and coalescence. Cyclic semi-solid heat treatment changes morphology of iron-rich intermetallics phases to be plate-like and fine plate iron-rich intermetallics phases, in stead of needle-like iron-rich intermetallics phases that are observed in as-cast samples. Cyclic heating shows a relatively higher hardness for all heating cycles compared with as-cast one due to its finer and globular structure. Cyclic semi-solid heat treatment technique results in lower coarsening rate constant compared with isothermal heat treatment one due to coarsening discontinuous effect.

太阳能热发电储热器防护涂层的制备及其性能

为了提高太阳能热发电中高温储热器的使用寿命,在310s不锈钢容器表面制备了3种防护涂层,研究了3种涂层的抗热震性能、力学性能和对相变储能材料Al-12.07%Si熔融液的耐蚀性能。结果表明,3种涂层抗热震性能好,与基体结合强度较高;在一定温度下具有较好的耐蚀性,有利于延长容器的使用寿命。

耐熔融铝硅腐蚀TiB_2涂层的制备及性能

在310S不锈钢容器内壁制备TiB2防护涂层,并对涂层的主要抗热震性能、力学性能、耐蚀性能进行分析。结果表明:TiB2涂层抗热震性能好,涂层与基体结合强度较高;同时涂层在一定温度限制下具有较好的耐蚀性,有利于延长容器的使用寿命。