Influence of ns-Laser Cleaning Parameters on the Removal of the Painted Layer and Selected Properties of the Base Metal

The removal of the surface paint of Q345 (Gr·B) steel, as well as microstructure and hardness of the cleaned surface were investigated. The laser source used in this study is a nanosecond pulsed Gaussian light source. The surface morphology and microstructure were characterized by a scanning electron microscope and electron back-scattered diffraction. A hardness test was used for capturing variations of the parameter of the cleaned region in comparison to the base metal. The results show that when the X-scanning speed was 1500 mm/s and Y-moving speeds was 7 mm/s during ns-laser cleaning, respectively, the cleaned surface was relatively flat and there was only a few small residual paint. In addition, the contents of Fe and C elements on the cleaned surface reached to 89% and 9%, respectively. Moreover, the roughness was the lowest of 0.5 μm through the observation of the three-dimensional topography. In addition, a fine grain layer appeared on the cleaned surface after laser cleaning at the X-scanning speeds of 500 mm/s and 1000 mm/s. The maximum hardness of the fine grain layer was more than 400 HV, higher than the base metal.

A painted layer for high-rate and high-capacity solid-state lithium–metal batteries

Based on a garnet solid electrolyte, an electron/ion dual-conductive framework established by a spraying method enabled an alloy anode that realized a high-rate operation.

Inscribed pot-stands represented in the Temple of Hatshepsut at Deir el-Bahari

On the lateral walls of the Bark Hall in the Main Sanctuary of Amun in the Temple of Hatshepsut, four stands for burning offerings are represented in front of Amun’s bark. Conservation work on the walls of this room uncovered the painted layer. One of the stands preserves traces of an inscription which was erased in ancient times in two phases. The first phase of erasure may be dated to the reign of Tuthmosis III, while the second one was executed during the Amarna period. The paper presents the legible parts of the text, which was a standard dedication formula, along with a reconstruction of the damaged areas

APPLICATION OF DIGITAL SURVEY MAPPING TECHNOLOGY IN THE INVESTIGATION OF COLORED WOOD STATUE IN THE CAOXI TEMPLE

The colored wood statues in the CaoXi Temple represent the Sandashi(Manjushri, Samantabhadra , Avalokitesvar) in the Buddhism.These statues with great value were carved in Dali kingdom of the Song dynasty. Because of natural and man-made reasons, disease has become very seriously both in the painted layer on the surface and the structure inside. So it is very important to record the current situation, analyze the structure, craft and material, and detect the cause of disease. This paper takes the colored wood statues as the research object, and kinds of digital survey technology were applied in the process. The Research results will play an important role in the protection, explanation and display.

Restaurarea picturii Peisaj cu biserică, de Ștefan Popescu

The paper presents some important aspects of the restoration- conservation process of a painted canvas, belonging to Ştefan Popescu, a romanian painter, whose creation, at the beginning of the 20th century, was famous especially through its landscapes. Stylistic and technological aspects of the painting were analyzed. The painting depicts a realistic landscape, with a house and an imposing stone church. A detailed account of the conservation state of the painting prior the restoration was made. The actual restoration process started with the cleaning of the superficial dirt and dust from the back of the painting. After protecting the entire face of the painting (by applying the Japanese paper), the old patch on the back of the painting (covering a small area of torn canvas) was replaced with a new one. The cleaning process (the removal of the light dirt and the old varnish layer) was followed by the filling of all the gaps of the painted layer with putty. The chromatic integration and the final varnishing ended the restoration process of the painted canvas.

Flocculation Gradient Technique in Terms of Kubelka—Munk Coefficients: Quantifying Black-Pigmented Dispersions

The diffuse reflectance from a painted layer depends upon the layer thickness. The rate of change of diffuse reflectance when thickness increases is the flocculation gradient, which is valuable information about the degree of pigment dispersion in paint. The simple determination method is called the flocculation gradient technique and is suitable to quantify the pigment dispersions in low-absorptive and high-scattering paints. To make the method useful for black-pigmented paints as well, we modified it by applying the Kubelka–Munk theory. This makes it possible to solve the problem of the very narrow linearity region that appears in the diffuse reflectance vs. thickness curve because of high absorption. The modified method allows one to quantify the degree of dispersion in black thickness-sensitive spectrally selective paints, which are used as absorbers in solar collectors.