硬质合金混合料是指由各种难熔金属碳化物和粘结金属及成型剂组成的有准确成份、一定粒度、均匀的粒状混合物,通常也叫RTP粉(Ready To Press Powder)。混合料的不同配方,对应于不同的工业用途。研究喷雾干燥工艺参数对硬质合金混合料物...硬质合金混合料是指由各种难熔金属碳化物和粘结金属及成型剂组成的有准确成份、一定粒度、均匀的粒状混合物,通常也叫RTP粉(Ready To Press Powder)。混合料的不同配方,对应于不同的工业用途。研究喷雾干燥工艺参数对硬质合金混合料物理性能的影响有助于硬质合金生产过程中的质量控制,从而提高硬质合金的使用寿命。本文通过DOE实验设计方法研究喷雾干燥各工艺参数对硬质合金混合料的松比、流动性、粒度分布等物理性能的影响。展开更多
Polydimethylsiloxane （PDMS）, tetraethoxysilane （TEOS）, ethyl alcohol （EtOH） and deionized water were main raw materials to prepare silicone-modified hybrid thin films using sol-gel method. The effect of the cont...Polydimethylsiloxane （PDMS）, tetraethoxysilane （TEOS）, ethyl alcohol （EtOH） and deionized water were main raw materials to prepare silicone-modified hybrid thin films using sol-gel method. The effect of the contents of H2O and PDMS on thin films was studied. When the volume ratio of H20 to TEOS is 0.5, the optimum quality of thin films is obtained. And the gelation time is affected slightly by H20 content. Uniform thin films are obtained when the volume ratio of PDMS to TEOS is 0.2. Yet, the sol would be inactive in 6 d. Various properties of thin films were studied, including hardness, adhesive quality, hydrophobic property, corrosion protection property, and abrasion resistance. Test results show that the pencil hardness is generally 3-6 H, and adhesive quality achieves the highest standard of 0. When the sintering temperature is below 400℃, the contact angle is about 95° and hydrophobic films are obtained. The abrasion resistance of thin films is better than that of aluminum alloy when the sintering temperature is higher than 300℃. And the excellent corrosion protective effect is obtained by single-layer coating when the sintering temperature is higher than 400℃.展开更多
文摘硬质合金混合料是指由各种难熔金属碳化物和粘结金属及成型剂组成的有准确成份、一定粒度、均匀的粒状混合物,通常也叫RTP粉(Ready To Press Powder)。混合料的不同配方,对应于不同的工业用途。研究喷雾干燥工艺参数对硬质合金混合料物理性能的影响有助于硬质合金生产过程中的质量控制,从而提高硬质合金的使用寿命。本文通过DOE实验设计方法研究喷雾干燥各工艺参数对硬质合金混合料的松比、流动性、粒度分布等物理性能的影响。
基金supported partly by the School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong university,China
文摘Polydimethylsiloxane （PDMS）, tetraethoxysilane （TEOS）, ethyl alcohol （EtOH） and deionized water were main raw materials to prepare silicone-modified hybrid thin films using sol-gel method. The effect of the contents of H2O and PDMS on thin films was studied. When the volume ratio of H20 to TEOS is 0.5, the optimum quality of thin films is obtained. And the gelation time is affected slightly by H20 content. Uniform thin films are obtained when the volume ratio of PDMS to TEOS is 0.2. Yet, the sol would be inactive in 6 d. Various properties of thin films were studied, including hardness, adhesive quality, hydrophobic property, corrosion protection property, and abrasion resistance. Test results show that the pencil hardness is generally 3-6 H, and adhesive quality achieves the highest standard of 0. When the sintering temperature is below 400℃, the contact angle is about 95° and hydrophobic films are obtained. The abrasion resistance of thin films is better than that of aluminum alloy when the sintering temperature is higher than 300℃. And the excellent corrosion protective effect is obtained by single-layer coating when the sintering temperature is higher than 400℃.
