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溶胶-凝胶法制备金刚石/陶瓷结合剂复合烧结体及其性能表征
({{custom_author.role_cn}}), {{javascript:window.custom_author_cn_index++;}}Preparation of diamond/vitrified bond composite sintered by sol-gel method and its performance characterization
({{custom_author.role_en}}), {{javascript:window.custom_author_en_index++;}}以金刚石和无机溶胶为原料，采用溶胶-凝胶法制备金刚石/陶瓷结合剂复合粉体，将粉体通过压制、烧结获得金刚石/陶瓷结合剂复合烧结体，利用XRD、SEM、电子万能试验机、洛氏硬度计等对复合烧结体进行性能表征。结果表明：采用溶胶-凝胶法可制备出组织均匀性较好的金刚石/陶瓷结合剂复合粉体，经680℃/2h烧结后试样的抗弯强度、硬度、密度和气孔率分别为58.54MPa，55.8HRB，1.74g/cm3，24.16%；而采用熔融法所制烧结试样的抗弯强度、硬度、密度和气孔率分别为51.32MPa，72.5HRB，1.92g/cm3，21.47%。与熔融法制备的金刚石/陶瓷结合剂磨削盘相比，采用溶胶-凝胶法制备的磨削盘结构均匀，磨削加工的TC4钛合金工件表面磨削质量高，工件表面粗糙度为0.051μm。
Based on the diamond and inorganic sol, sol-gel(S-G) method was used to prepare diamond/vitrified bond composite powder and then the bulk samples were obtained after the powder was pressed and sintered, and the bond composite powder was characterized by XRD, SEM, electronic universal testing machine, Rockwell hardness tester, etc. The results show that diamond/vitrified bond composite powder with good uniformity can be prepared by S-G method, and the bending strength, Rockwell hardness, volume density and porosity of samples sintered at 680℃/2h are 58.54MPa, 55.8HRB, 1.74g/cm3and 24.16%, respectively; when these samples were obtained by melting method, the corresponding figures are 51.32MPa, 72.5HRB, 1.92g/cm3and 21.47%, respectively. Compared to the melting method, the microstructure of grinding disc prepared by S-G method is uniform and high quality is observed on the machined surface of TC4 titanium alloy, whose Ra reaches 0.051μm.
溶胶-凝胶法 / 金刚石 / 陶瓷结合剂 / 性能 {{custom_keyword}} /
sol-gel method / diamond / vitrified bond / property {{custom_keyword}} /
表 1 陶瓷结合剂配方Table 1 Formula of the vitrified bond |
| Component | Mole fraction/% |
| SiO2 | 56.0 |
| B2O3 | 8.0 |
| Al2O3 | 9.5 |
| Na2O | 8.0 |
| Li2O | 11.5 |
| ZnO | 7.0 |
图 1 金刚石/陶瓷结合剂复合体烧结曲线(a)溶胶-凝胶法；(b)熔融法 Fig.1 Sintering curves of diamond/vitrified bond composites (a)S-G method; (b)melting method |
表 2 不同工艺所制备的金刚石/陶瓷结合剂复合烧结体的性能Table 2 Properties of diamond/vitrified bond composite sintered prepared by different processes |
| Technological method | Bending strength/MPa | Rockwell hardness(HRB) | Volume density/ (g·cm-3) | Porosity/ % |
| S-G method | 58.54 | 55.8 | 1.74 | 24.16 |
| Melting method | 51.32 | 72.5 | 1.92 | 21.47 |
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PDF(2074 KB)
表 1 陶瓷结合剂配方
图 1 金刚石/陶瓷结合剂复合体烧结曲线图 2 金刚石/陶瓷结合剂磨削盘图 3 金刚石微粉的SEM图图 4 金刚石微粉的XRD图谱图 5 金刚石微粉在空气中加热到950℃的TG-DSC曲线图 6 不同工艺所制金刚石/陶瓷结合剂复合烧结体试样的XRD图谱图 7 不同工艺制备的金刚石/陶瓷结合剂复合烧结体断面形貌 (a)溶胶-凝胶法；(b)熔融法表 2 不同工艺所制备的金刚石/陶瓷结合剂复合烧结体的性能图 8 TC4钛合金经金刚石/陶瓷结合剂磨削盘磨削后的表面形貌 (a)溶胶-凝胶法；(b)熔融法/
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